diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/Globals.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/Globals.kt
index 69b2819d..36d86cc6 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/Globals.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/Globals.kt
@@ -227,10 +227,9 @@ object Globals {
 
 		tasks.add(Starbound.GLOBAL_SCOPE.launch { load("/names/profanityfilter.config", ::profanityFilterInternal, lazy { Starbound.gson.listAdapter() }) }.asCompletableFuture())
 
-		CompletableFuture.allOf(*tasks.toTypedArray()).thenApply {
+		// if some load tasks fail then don't fail entire future
+		CompletableFuture.allOf(*tasks.map { it.exceptionally { null } }.toTypedArray()).thenApply {
 			onLoadedFuture.complete(Unit)
-		}.exceptionally {
-			onLoadedFuture.completeExceptionally(it)
 		}
 
 		return tasks
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/Registries.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/Registries.kt
index 70835ba8..3eb6b478 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/Registries.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/Registries.kt
@@ -45,6 +45,7 @@ import ru.dbotthepony.kstarbound.defs.world.BiomeDefinition
 import ru.dbotthepony.kstarbound.item.ItemRegistry
 import ru.dbotthepony.kstarbound.json.JsonPatch
 import ru.dbotthepony.kstarbound.json.builder.JsonFactory
+import ru.dbotthepony.kstarbound.json.fromJsonTreeFast
 import ru.dbotthepony.kstarbound.world.terrain.TerrainSelectorType
 import ru.dbotthepony.kstarbound.util.AssetPathStack
 import ru.dbotthepony.kstarbound.world.physics.CollisionType
@@ -124,7 +125,7 @@ object Registries {
 					val elem = JsonPatch.applyAsync(Starbound.ELEMENTS_ADAPTER.read(listedFile.asyncJsonReader().await()), patches[listedFile.computeFullPath()])
 
 					AssetPathStack(listedFile.computeFullPath()) {
-						val read = adapter.fromJsonTree(elem)
+						val read = adapter.fromJsonTreeFast(elem)
 						val keys = keyProvider(read)
 
 						after(read, listedFile)
@@ -199,7 +200,7 @@ object Registries {
 
 					for ((k, v) in json.entrySet()) {
 						try {
-							val value = adapter.fromJsonTree(v)
+							val value = adapter.fromJsonTreeFast(v)
 							transform(value, k)
 
 							registry.add {
@@ -264,7 +265,7 @@ object Registries {
 	private fun loadMetaMaterials(): Future<*> {
 		return Starbound.GLOBAL_SCOPE.async {
 			val read = Starbound.loadJsonAsset("/metamaterials.config").await() ?: return@async
-			val read2 = Starbound.gson.getAdapter(object : TypeToken<ImmutableList<MetaMaterialDef>>() {}).fromJsonTree(read)
+			val read2 = Starbound.gson.getAdapter(object : TypeToken<ImmutableList<MetaMaterialDef>>() {}).fromJsonTreeFast(read)
 
 			for (def in read2) {
 				tiles.add {
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/Starbound.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/Starbound.kt
index d1a3b537..482f29ac 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/Starbound.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/Starbound.kt
@@ -772,7 +772,7 @@ object Starbound : BlockableEventLoop("Universe Thread"), Scheduler, ISBFileLoca
 	}
 
 	fun generateName(asset: String, random: RandomGenerator): String {
-		val load = loadJsonAsset(asset) as? JsonArray ?: return "missingasset"
+		val load = loadJsonAsset(asset).get() as? JsonArray ?: return "missingasset"
 
 		var tries = 500
 		var result = ""
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/VersionRegistry.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/VersionRegistry.kt
index 954b6fa0..1d841926 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/VersionRegistry.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/VersionRegistry.kt
@@ -5,6 +5,7 @@ import com.google.gson.JsonObject
 import com.google.gson.TypeAdapter
 import com.google.gson.stream.JsonReader
 import it.unimi.dsi.fastutil.objects.Object2IntOpenHashMap
+import ru.dbotthepony.kstarbound.json.FastJsonTreeReader
 import ru.dbotthepony.kstarbound.json.VersionedJson
 import java.util.concurrent.Future
 
@@ -19,24 +20,32 @@ object VersionRegistry {
 		return VersionedJson(name, currentVersion(name), contents)
 	}
 
-	fun <T> load(name: String, reader: JsonReader, adapter: TypeAdapter<T>): T {
-		val read = this.adapter.read(reader) ?: throw NullPointerException("Expected versioned json $name, but found null")
-
-		if (read.version != currentVersion(name)) {
-			throw IllegalStateException("NYI: Migrating $name from ${read.version} to ${currentVersion(name)}")
+	private fun migrate(read: VersionedJson, identifier: String = read.id): JsonElement {
+		if (read.version != currentVersion(identifier)) {
+			throw IllegalStateException("NYI: Migrating $identifier from ${read.version} to ${currentVersion(identifier)}")
 		}
 
-		return adapter.fromJsonTree(read.content)
+		return read.content
+	}
+
+	fun <T> load(name: String, reader: JsonReader, adapter: TypeAdapter<T>): T {
+		val read = this.adapter.read(reader) ?: throw NullPointerException("Expected versioned json $name, but found null")
+		return adapter.fromJsonTree(migrate(read, name))
+	}
+
+	fun <T> load(name: String, reader: JsonElement, adapter: TypeAdapter<T>): T {
+		val read = this.adapter.read(FastJsonTreeReader(reader)) ?: throw NullPointerException("Expected versioned json $name, but found null")
+		return adapter.fromJsonTree(migrate(read, name))
 	}
 
 	fun load(name: String, reader: JsonReader): JsonElement {
 		val read = this.adapter.read(reader) ?: throw NullPointerException("Expected versioned json $name, but found null")
+		return migrate(read, name)
+	}
 
-		if (read.version != currentVersion(name)) {
-			throw IllegalStateException("NYI: Migrating $name from ${read.version} to ${currentVersion(name)}")
-		}
-
-		return read.content
+	fun load(name: String, reader: JsonElement): JsonElement {
+		val read = this.adapter.read(FastJsonTreeReader(reader)) ?: throw NullPointerException("Expected versioned json $name, but found null")
+		return migrate(read, name)
 	}
 
 	private val adapter by lazy { Starbound.gson.getAdapter(VersionedJson::class.java) }
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/defs/item/ItemDescriptor.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/defs/item/ItemDescriptor.kt
index 1b7ef06d..8c79cefc 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/defs/item/ItemDescriptor.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/defs/item/ItemDescriptor.kt
@@ -24,6 +24,7 @@ import ru.dbotthepony.kommons.io.StreamCodec
 import ru.dbotthepony.kommons.io.readVarLong
 import ru.dbotthepony.kommons.io.writeBinaryString
 import ru.dbotthepony.kommons.io.writeVarLong
+import ru.dbotthepony.kommons.util.Either
 import ru.dbotthepony.kommons.util.KOptional
 import ru.dbotthepony.kstarbound.Starbound
 import ru.dbotthepony.kstarbound.VersionRegistry
@@ -203,30 +204,33 @@ data class ItemDescriptor(
 		}
 	}
 
+	fun build(level: Double? = null, seed: Long? = null, random: RandomGenerator? = null): ItemStack {
+		try {
+			val (config, parameters) = buildConfig(level, seed, random)
+			val jConfig = config.map({ it }, { toJsonFromLua(it).asJsonObject })
+			val jParameters = parameters.map({ it }, { toJsonFromLua(it).asJsonObject })
+			return ref.type.factory(ref, jConfig, jParameters, count)
+		} catch (err: Throwable) {
+			LOGGER.error("Error while building item '$name' using script ${ref.json["builder"]}", err)
+			return ref.type.factory(ref, ref.json, parameters.deepCopy(), count)
+		}
+	}
+
 	/**
 	 * This is fragile, to some extent, because it is SOLE RESPONSIBILITY of builder script to store
 	 * [level] and/or [seed] inside item parameters once it is built (otherwise we will get different or
 	 * reset stats on next item load from serialized state)
 	 */
-	fun build(level: Double? = null, seed: Long? = null, random: RandomGenerator? = null): ItemStack {
-		val builder = ref.json["builder"]?.asString ?: return ref.type.factory(ref, ref.json, parameters.deepCopy(), count)
+	fun buildConfig(level: Double? = null, seed: Long? = null, random: RandomGenerator? = null): Pair<Either<JsonObject, Table>, Either<JsonObject, Table>> {
+		val builder = ref.json["builder"]?.asString ?: return Either.left<JsonObject, Table>(ref.json) to Either.left(parameters.deepCopy())
 
-		try {
-			val lua = LuaEnvironment()
-			lua.attach(Starbound.loadScript(builder))
-			lua.random = random ?: lua.random
-			lua.init(false)
+		val lua = LuaEnvironment()
+		lua.attach(Starbound.loadScript(builder))
+		lua.random = random ?: lua.random
+		lua.init(false)
 
-			val (config, parameters) = lua.invokeGlobal("build", ref.directory + "/", lua.from(ref.json), lua.from(parameters), level, seed)
-
-			val jConfig = toJsonFromLua(config).asJsonObject
-			val jParameters = toJsonFromLua(parameters).asJsonObject
-
-			return ref.type.factory(ref, jConfig, jParameters, count)
-		} catch (err: Throwable) {
-			LOGGER.error("Error while building item '$name' using script $builder", err)
-			return ref.type.factory(ref, ref.json, parameters.deepCopy(), count)
-		}
+		val (config, parameters) = lua.invokeGlobal("build", ref.directory + "/", lua.from(ref.json), lua.from(parameters), level, seed)
+		return Either.right<JsonObject, Table>(config as Table) to Either.right(parameters as Table)
 	}
 
 	fun write(stream: DataOutputStream) {
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/item/ItemRegistry.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/item/ItemRegistry.kt
index e9fe879a..11ef5548 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/item/ItemRegistry.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/item/ItemRegistry.kt
@@ -70,6 +70,10 @@ object ItemRegistry {
 		return entry
 	}
 
+	operator fun contains(name: String): Boolean {
+		return name in entries
+	}
+
 	@JsonFactory
 	data class ReadData(
 		val itemName: String,
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/item/RecipeRegistry.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/item/RecipeRegistry.kt
index ff2799e5..ecc2aa2a 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/item/RecipeRegistry.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/item/RecipeRegistry.kt
@@ -3,6 +3,7 @@ package ru.dbotthepony.kstarbound.item
 import com.google.gson.JsonElement
 import it.unimi.dsi.fastutil.objects.Object2ObjectFunction
 import it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap
+import it.unimi.dsi.fastutil.objects.ObjectArrayList
 import org.apache.logging.log4j.LogManager
 import ru.dbotthepony.kstarbound.IStarboundFile
 import ru.dbotthepony.kstarbound.Starbound
@@ -18,7 +19,7 @@ object RecipeRegistry {
 
 	data class Entry(val value: RecipeDefinition, val json: JsonElement, val file: IStarboundFile)
 
-	private val recipesInternal = ArrayList<Entry>()
+	private val recipesInternal = ObjectArrayList<Entry>()
 	private val group2recipesInternal = Object2ObjectOpenHashMap<String, ArrayList<Entry>>()
 	private val group2recipesBacking = Object2ObjectOpenHashMap<String, List<Entry>>()
 	private val output2recipesInternal = Object2ObjectOpenHashMap<String, ArrayList<Entry>>()
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/lua/bindings/RootBindings.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/lua/bindings/RootBindings.kt
index d75fd2bb..dd278e8d 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/lua/bindings/RootBindings.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/lua/bindings/RootBindings.kt
@@ -1,6 +1,7 @@
 package ru.dbotthepony.kstarbound.lua.bindings
 
 import it.unimi.dsi.fastutil.objects.Object2IntOpenHashMap
+import org.apache.logging.log4j.LogManager
 import org.classdump.luna.ByteString
 import org.classdump.luna.LuaRuntimeException
 import org.classdump.luna.Table
@@ -12,9 +13,11 @@ import ru.dbotthepony.kstarbound.item.RecipeRegistry
 import ru.dbotthepony.kstarbound.Registries
 import ru.dbotthepony.kstarbound.Registry
 import ru.dbotthepony.kstarbound.Starbound
+import ru.dbotthepony.kstarbound.VersionRegistry
 import ru.dbotthepony.kstarbound.defs.image.Image
 import ru.dbotthepony.kstarbound.defs.image.SpriteReference
 import ru.dbotthepony.kstarbound.defs.item.ItemDescriptor
+import ru.dbotthepony.kstarbound.item.ItemRegistry
 import ru.dbotthepony.kstarbound.lua.LUA_HINT_ARRAY
 import ru.dbotthepony.kstarbound.lua.LuaEnvironment
 import ru.dbotthepony.kstarbound.lua.StateMachine
@@ -32,7 +35,9 @@ import ru.dbotthepony.kstarbound.lua.luaStub
 import ru.dbotthepony.kstarbound.lua.nextOptionalFloat
 import ru.dbotthepony.kstarbound.lua.nextOptionalInteger
 import ru.dbotthepony.kstarbound.lua.set
+import ru.dbotthepony.kstarbound.lua.tableMapOf
 import ru.dbotthepony.kstarbound.lua.tableOf
+import ru.dbotthepony.kstarbound.lua.toJsonFromLua
 import ru.dbotthepony.kstarbound.lua.toLuaInteger
 import ru.dbotthepony.kstarbound.util.random.random
 import kotlin.collections.component1
@@ -43,6 +48,8 @@ import kotlin.collections.set
 import kotlin.collections.withIndex
 import kotlin.math.max
 
+private val LOGGER = LogManager.getLogger()
+
 private fun <T : Any> lookup(registry: Registry<T>, key: Any?): Registry.Entry<T>? {
 	if (key is ByteString) {
 		return registry[key.decode()]
@@ -63,20 +70,20 @@ private fun <T : Any> lookupStrict(registry: Registry<T>, key: Any?): Registry.E
 	}
 }
 
-private fun evalFunction(context: ExecutionContext, name: ByteString, value: Double) {
+private val evalFunction = luaFunction { name: ByteString, value: Double ->
 	val fn = Registries.jsonFunctions[name.decode()] ?: throw LuaRuntimeException("No such function $name")
-	context.returnBuffer.setTo(fn.value.evaluate(value))
+	returnBuffer.setTo(fn.value.evaluate(value))
 }
 
-private fun evalFunction2(context: ExecutionContext, name: ByteString, value: Double, value2: Double) {
+private val evalFunction2 = luaFunction { name: ByteString, value: Double, value2: Double ->
 	val fn = Registries.json2Functions[name.decode()] ?: throw LuaRuntimeException("No such function $name")
-	context.returnBuffer.setTo(fn.value.evaluate(value, value2))
+	returnBuffer.setTo(fn.value.evaluate(value, value2))
 }
 
-private fun imageSize(context: ExecutionContext, name: ByteString) {
+private val imageSize = luaFunction { name: ByteString ->
 	val ref = SpriteReference.create(name.decode())
 	val sprite = ref.sprite ?: throw LuaRuntimeException("No such image or sprite $ref")
-	context.returnBuffer.setTo(context.tableOf(sprite.width, sprite.height))
+	returnBuffer.setTo(tableOf(sprite.width, sprite.height))
 }
 
 private fun imageSpaces(context: ExecutionContext, arguments: ArgumentIterator): StateMachine {
@@ -133,15 +140,15 @@ private fun registryDefExists(registry: Registry<*>): LuaFunction<ByteString, *,
 	}
 }
 
-private fun recipesForItem(context: ExecutionContext, name: ByteString) {
+private val recipesForItem = luaFunction { name: ByteString ->
 	val list = RecipeRegistry.output2recipes[name.decode()]
 
 	if (list == null) {
-		context.returnBuffer.setTo(context.newTable())
+		returnBuffer.setTo(newTable())
 	} else {
-		context.returnBuffer.setTo(context.newTable(list.size, 0).also {
+		returnBuffer.setTo(newTable(list.size, 0).also {
 			for ((i, v) in list.withIndex()) {
-				it.rawset(i + 1L, context.from(v.json))
+				it.rawset(i + 1L, from(v.json))
 			}
 		})
 	}
@@ -170,30 +177,16 @@ private fun getMatchingTenants(context: ExecutionContext, tags: Table) {
 	})
 }
 
-private fun liquidStatusEffects(context: ExecutionContext, id: Any) {
+private val liquidStatusEffects = luaFunction { id: Any ->
 	val liquid = lookup(Registries.liquid, id)
 
 	if (liquid == null) {
-		context.returnBuffer.setTo(context.newTable())
+		returnBuffer.setTo(tableOf())
 	} else {
-		context.returnBuffer.setTo(context.newTable(liquid.value.statusEffects.size, 0).also {
-			for ((k, v) in liquid.value.statusEffects.withIndex()) {
-				it[k + 1] = v.key.map({ it }, { it })
-			}
-		})
+		returnBuffer.setTo(tableOf(*liquid.value.statusEffects.map { it.key.map({ it }, { it }) }.toTypedArray()))
 	}
 }
 
-private fun createTreasure(context: ExecutionContext, arguments: ArgumentIterator) {
-	val pool = arguments.nextString().decode()
-	val level = arguments.nextFloat()
-	val seed = arguments.nextOptionalInteger()
-
-	val get = Registries.treasurePools[pool] ?: throw LuaRuntimeException("No such treasure pool $pool")
-
-	context.returnBuffer.setTo(context.tableOf(*get.value.evaluate(seed ?: System.nanoTime(), level).filter { it.isNotEmpty }.map { context.from(it.toJson()) }.toTypedArray()))
-}
-
 private fun materialMiningSound(context: ExecutionContext, arguments: ArgumentIterator) {
 	val tile = lookup(Registries.tiles, arguments.nextAny())
 	val mod = lookup(Registries.tiles, arguments.nextOptionalAny(null))
@@ -229,24 +222,24 @@ private fun materialFootstepSound(context: ExecutionContext, arguments: Argument
 	context.returnBuffer.setTo(Globals.client.defaultFootstepSound.map({ it }, { it.random() }))
 }
 
-private fun materialHealth(context: ExecutionContext, arguments: ArgumentIterator) {
-	context.returnBuffer.setTo(lookupStrict(Registries.tiles, arguments.nextAny()).value.actualDamageTable.totalHealth)
+private val materialHealth = luaFunction { id: Any ->
+	returnBuffer.setTo(lookupStrict(Registries.tiles, id).value.actualDamageTable.totalHealth)
 }
 
-private fun liquidName(context: ExecutionContext, arguments: ArgumentIterator) {
-	context.returnBuffer.setTo(lookupStrict(Registries.liquid, arguments.nextAny()).key)
+private val liquidName = luaFunction { id: Any ->
+	returnBuffer.setTo(lookupStrict(Registries.liquid, id).key)
 }
 
-private fun liquidId(context: ExecutionContext, arguments: ArgumentIterator) {
-	context.returnBuffer.setTo(lookupStrict(Registries.liquid, arguments.nextAny()).id)
+private val liquidId = luaFunction { id: Any ->
+	returnBuffer.setTo(lookupStrict(Registries.liquid, id).id)
 }
 
-private fun techType(context: ExecutionContext, arguments: ArgumentIterator) {
-	context.returnBuffer.setTo(lookupStrict(Registries.techs, arguments.nextAny()).value.type)
+private val techType = luaFunction { id: Any ->
+	returnBuffer.setTo(lookupStrict(Registries.techs, id).value.type)
 }
 
-private fun techConfig(context: ExecutionContext, arguments: ArgumentIterator) {
-	context.returnBuffer.setTo(lookupStrict(Registries.techs, arguments.nextAny()).json)
+private val techConfig = luaFunction { id: Any ->
+	returnBuffer.setTo(lookupStrict(Registries.techs, id).json)
 }
 
 private val jobject = luaFunction { returnBuffer.setTo(createJsonObject()) }
@@ -343,20 +336,100 @@ private val jresize = luaFunction { self: Table, target: Long ->
 	indexSetNoYield(self, target, indexNoYield(self, target))
 }
 
+private val assetJson = luaFunction { path: ByteString ->
+	returnBuffer.setTo(from(Starbound.loadJsonAsset(path.decode()).get()))
+}
+
+private val makeCurrentVersionedJson = luaFunction { identifier: ByteString, content: Any? ->
+	returnBuffer.setTo(from(VersionRegistry.make(identifier.decode(), toJsonFromLua(content)).toJson()))
+}
+
+private val loadVersionedJson = luaFunction { data: Any?, identifier: ByteString ->
+	returnBuffer.setTo(from(VersionRegistry.load(identifier.decode(), toJsonFromLua(data))))
+}
+
+private val createBiome = luaFunction { name: ByteString, seed: Number, verticalMidPoint: Number, threatLevel: Number ->
+	try {
+		val biome = Registries.biomes
+			.getOrThrow(name.decode())
+			.value
+			.create(random(seed.toLong()), verticalMidPoint.toInt(), threatLevel.toDouble())
+
+		returnBuffer.setTo(from(Starbound.gson.toJsonTree(biome)))
+	} catch (err: Throwable) {
+		LOGGER.error("Exception while creating biome for Lua script of name $name with seed $seed, with verticalMidPoint $verticalMidPoint, with threatLevel $threatLevel", err)
+	}
+}
+
+private val treeStemDirectory = luaFunction { name: ByteString ->
+	returnBuffer.setTo(Registries.treeStemVariants[name.decode()]?.file?.computeDirectory(true) ?: "/")
+}
+
+private val treeFoliageDirectory = luaFunction { name: ByteString ->
+	returnBuffer.setTo(Registries.treeFoliageVariants[name.decode()]?.file?.computeDirectory(true) ?: "/")
+}
+
+private val itemConfig = luaFunction { descriptor: Any, level: Number?, seed: Number? ->
+	val desc = ItemDescriptor(descriptor)
+
+	if (desc.name !in ItemRegistry) {
+		returnBuffer.setTo()
+	} else {
+		val (config, params) = desc.buildConfig(level?.toDouble(), seed?.toLong())
+
+		returnBuffer.setTo(tableMapOf(
+			"directory" to ItemRegistry[desc.name].directory,
+			"config" to config.map({ from(it) }, { it }),
+			"parameters" to params.map({ from(it) }, { it })
+		))
+	}
+}
+
+// why
+private val createItem = luaFunction { descriptor: Any, level: Number?, seed: Number? ->
+	val desc = ItemDescriptor(descriptor)
+
+	if (desc.name !in ItemRegistry) {
+		throw LuaRuntimeException("No such item ${desc.name}")
+	} else {
+		val (_, params) = desc.buildConfig(level?.toDouble(), seed?.toLong())
+		val tab = desc.toTable(this)
+
+		if (tab != null)
+			tab["parameters"] = params.map({ from(it) }, { it })
+
+		returnBuffer.setTo(tab)
+	}
+}
+
+private val itemType = luaFunction { identifier: ByteString ->
+	returnBuffer.setTo(ItemRegistry[identifier.decode()].type.jsonName)
+}
+
+private val itemTags = luaFunction { identifier: ByteString ->
+	returnBuffer.setTo(tableOf(*ItemRegistry[identifier.decode()].itemTags.toTypedArray()))
+}
+
+private val itemHasTag = luaFunction { identifier: ByteString, tag: ByteString ->
+	returnBuffer.setTo(tag.decode() in ItemRegistry[identifier.decode()].itemTags)
+}
+
 fun provideRootBindings(lua: LuaEnvironment) {
 	val table = lua.newTable()
 	lua.globals["root"] = table
+	lua.globals["jobject"] = jobject
+	lua.globals["jarray"] = jarray
+	lua.globals["jremove"] = jremove
+	lua.globals["jsize"] = jsize
+	lua.globals["jresize"] = jresize
 
-	table["assetJson"] = luaFunction { path: ByteString ->
-		returnBuffer.setTo(from(Starbound.loadJsonAsset(path.decode()).get()))
-	}
+	table["assetJson"] = assetJson
+	table["makeCurrentVersionedJson"] = makeCurrentVersionedJson
+	table["loadVersionedJson"] = loadVersionedJson
 
-	table["makeCurrentVersionedJson"] = luaStub("makeCurrentVersionedJson")
-	table["loadVersionedJson"] = luaStub("loadVersionedJson")
-
-	table["evalFunction"] = luaFunction(::evalFunction)
-	table["evalFunction2"] = luaFunction(::evalFunction2)
-	table["imageSize"] = luaFunction(::imageSize)
+	table["evalFunction"] = evalFunction
+	table["evalFunction2"] = evalFunction2
+	table["imageSize"] = imageSize
 	table["imageSpaces"] = luaFunctionNS("imageSpaces", ::imageSpaces)
 	table["nonEmptyRegion"] = luaFunction(::nonEmptyRegion)
 	table["npcConfig"] = registryDef(Registries.npcTypes)
@@ -365,18 +438,17 @@ fun provideRootBindings(lua: LuaEnvironment) {
 	table["projectileGravityMultiplier"] = luaStub("projectileGravityMultiplier")
 	table["projectileConfig"] = registryDef(Registries.projectiles)
 
-	table["recipesForItem"] = luaFunction(::recipesForItem)
-	table["itemType"] = luaStub("itemType")
-	table["itemTags"] = luaStub("itemTags")
-	table["itemHasTag"] = luaStub("itemHasTag")
+	table["recipesForItem"] = recipesForItem
+	table["itemType"] = itemType
+	table["itemTags"] = itemTags
+	table["itemHasTag"] = itemHasTag
+	table["itemConfig"] = itemConfig
+	table["createItem"] = createItem
 
-	table["itemConfig"] = luaStub("itemConfig")
-
-	table["createItem"] = luaStub("createItem")
 	table["tenantConfig"] = registryDef(Registries.tenants)
 
 	table["getMatchingTenants"] = luaFunction(::getMatchingTenants)
-	table["liquidStatusEffects"] = luaFunction(::liquidStatusEffects)
+	table["liquidStatusEffects"] = liquidStatusEffects
 
 	table["generateName"] = luaFunction { asset: ByteString, seed: Number? ->
 		returnBuffer.setTo(Starbound.generateName(asset.decode(), if (seed == null) lua.random else random(seed.toLong())))
@@ -389,43 +461,39 @@ fun provideRootBindings(lua: LuaEnvironment) {
 	table["npcPortrait"] = luaStub("npcPortrait")
 
 	table["isTreasurePool"] = registryDefExists(Registries.treasurePools)
-	table["createTreasure"] = luaFunctionN("createTreasure", ::createTreasure)
+
+	table["createTreasure"] = luaFunction { pool: ByteString, level: Number, seed: Number? ->
+		val get = Registries.treasurePools[pool.decode()] ?: throw LuaRuntimeException("No such treasure pool $pool")
+		val random = if (seed == null) lua.random else random(seed.toLong())
+		returnBuffer.setTo(tableOf(*get.value.evaluate(random, level.toDouble()).filter { it.isNotEmpty }.map { from(it.toJson()) }.toTypedArray()))
+	}
+
 	table["materialMiningSound"] = luaFunctionN("materialMiningSound", ::materialMiningSound)
 	table["materialFootstepSound"] = luaFunctionN("materialFootstepSound", ::materialFootstepSound)
-	table["materialHealth"] = luaFunctionN("materialHealth", ::materialHealth)
+	table["materialHealth"] = materialHealth
 
 	table["materialConfig"] = registryDef2(Registries.tiles)
 	table["modConfig"] = registryDef2(Registries.tileModifiers)
 
-	table["liquidName"] = luaFunctionN("liquidName", ::liquidName)
-	table["liquidId"] = luaFunctionN("liquidId", ::liquidId)
+	table["liquidName"] = liquidName
+	table["liquidId"] = liquidId
+
+	table["createBiome"] = createBiome
 
-	table["createBiome"] = luaStub("createBiome")
 	table["monsterSkillParameter"] = luaStub("monsterSkillParameter")
 	table["monsterParameters"] = luaStub("monsterParameters")
 	table["monsterMovementSettings"] = luaStub("monsterMovementSettings")
 
 	table["hasTech"] = registryDefExists(Registries.techs)
-	table["techType"] = luaFunctionN("techType", ::techType)
-	table["techConfig"] = luaFunctionN("techConfig", ::techConfig)
+	table["techType"] = techType
+	table["techConfig"] = techConfig
 
-	table["treeStemDirectory"] = luaFunction { name: ByteString ->
-		returnBuffer.setTo(Registries.treeStemVariants[name.decode()]?.file?.computeDirectory(true) ?: "/")
-	}
-
-	table["treeFoliageDirectory"] = luaFunction { name: ByteString ->
-		returnBuffer.setTo(Registries.treeFoliageVariants[name.decode()]?.file?.computeDirectory(true))
-	}
+	table["treeStemDirectory"] = treeStemDirectory
+	table["treeFoliageDirectory"] = treeFoliageDirectory
 
 	table["collection"] = luaStub("collection")
 	table["collectables"] = luaStub("collectables")
 	table["elementalResistance"] = luaStub("elementalResistance")
 	table["dungeonMetadata"] = luaStub("dungeonMetadata")
 	table["behavior"] = luaStub("behavior")
-
-	lua.globals["jobject"] = jobject
-	lua.globals["jarray"] = jarray
-	lua.globals["jremove"] = jremove
-	lua.globals["jsize"] = jsize
-	lua.globals["jresize"] = jresize
 }
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/network/syncher/NetworkedDynamicGroup.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/network/syncher/NetworkedDynamicGroup.kt
index 2a84923e..ebba2ce3 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/network/syncher/NetworkedDynamicGroup.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/network/syncher/NetworkedDynamicGroup.kt
@@ -4,6 +4,7 @@ import it.unimi.dsi.fastutil.ints.Int2ObjectAVLTreeMap
 import it.unimi.dsi.fastutil.ints.IntAVLTreeSet
 import it.unimi.dsi.fastutil.io.FastByteArrayInputStream
 import it.unimi.dsi.fastutil.io.FastByteArrayOutputStream
+import it.unimi.dsi.fastutil.objects.ObjectArrayList
 import ru.dbotthepony.kommons.io.readByteArray
 import ru.dbotthepony.kommons.io.readVarInt
 import ru.dbotthepony.kommons.io.writeByteArray
@@ -68,7 +69,7 @@ class NetworkedDynamicGroup<T : Any>(private val factory: () -> T, private val a
 	}
 
 	private var listenedVersion = 0L
-	private val nonListenableElements = ArrayList<NetworkedElement>()
+	private val nonListenableElements = ObjectArrayList<NetworkedElement>()
 	private val listenersOnElements = Int2ObjectAVLTreeMap<Listenable.L>()
 
 	private fun setupElement(element: NetworkedElement, id: Int) {
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/network/syncher/NetworkedGroup.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/network/syncher/NetworkedGroup.kt
index c211b1d0..6435b5ac 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/network/syncher/NetworkedGroup.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/network/syncher/NetworkedGroup.kt
@@ -1,5 +1,6 @@
 package ru.dbotthepony.kstarbound.network.syncher
 
+import it.unimi.dsi.fastutil.objects.ObjectArrayList
 import ru.dbotthepony.kommons.io.readVarInt
 import ru.dbotthepony.kommons.io.writeVarInt
 import ru.dbotthepony.kommons.util.Listenable
@@ -16,8 +17,8 @@ class NetworkedGroup() : NetworkedElement() {
 
 	// element -> propagateInterpolation
 	private data class Element(val element: NetworkedElement, val propagateInterpolation: Boolean, val listener: Listenable.L?)
-	private val elements = ArrayList<Element>()
-	private val nonListenableElements = ArrayList<NetworkedElement>()
+	private val elements = ObjectArrayList<Element>()
+	private val nonListenableElements = ObjectArrayList<NetworkedElement>()
 	private var listenedVersion = 0L
 
 	var isInterpolating = false
@@ -26,7 +27,7 @@ class NetworkedGroup() : NetworkedElement() {
 		private set
 
 	override fun toString(): String {
-		if (elements.isEmpty())
+		if (elements.isEmpty)
 			return "NetworkedGroup[]"
 
 		return "NetworkedGroup[\n${elements.joinToString("\n") { "\t" + it.element.toString() }}]"
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/server/ServerConnection.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/server/ServerConnection.kt
index 508c674e..c14fc197 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/server/ServerConnection.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/server/ServerConnection.kt
@@ -522,6 +522,7 @@ class ServerConnection(val server: StarboundServer, type: ConnectionType) : Conn
 	}
 
 	override fun disconnect(reason: String) {
+		LOGGER.info("${alias()} disconnect initiated with reason $reason")
 		announceDisconnect(reason)
 
 		if (channel.isOpen) {
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/util/BlockableEventLoop.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/util/BlockableEventLoop.kt
index c17d32d9..87c03aff 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/util/BlockableEventLoop.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/util/BlockableEventLoop.kt
@@ -29,6 +29,9 @@ import kotlin.math.absoluteValue
 open class BlockableEventLoop(name: String) : Thread(name), ScheduledExecutorService {
 	private class ScheduledTask<T>(callable: Callable<T>, var executeAt: Long, val repeat: Boolean, val timeDelay: Long, val isFixedDelay: Boolean) : FutureTask<T>(callable), ScheduledFuture<T> {
 		override fun compareTo(other: Delayed): Int {
+			if (other is ScheduledTask<*>)
+				return executeAt.compareTo(other.executeAt)
+
 			return getDelay(TimeUnit.NANOSECONDS).compareTo(other.getDelay(TimeUnit.NANOSECONDS))
 		}
 
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/world/EntityIndex.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/world/EntityIndex.kt
index a002bc1e..41866461 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/world/EntityIndex.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/world/EntityIndex.kt
@@ -67,7 +67,7 @@ class EntityIndex(val geometry: WorldGeometry) {
 	inner class Entry(val value: AbstractEntity) : Comparable<Entry> {
 		private val sectors = Object2IntAVLTreeMap<Sector>()
 		val id = counter.getAndIncrement()
-		private val fixtures = ArrayList<Fixture>(1)
+		private val fixtures = ObjectArrayList<Fixture>(1)
 
 		// default fixture since in most cases it should be enough
 		val fixture = Fixture()
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/tile/ContainerObject.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/tile/ContainerObject.kt
index 0de42ecd..8a81035b 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/tile/ContainerObject.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/tile/ContainerObject.kt
@@ -190,9 +190,20 @@ class ContainerObject(config: Registry.Entry<ObjectDefinition>) : WorldObject(co
 
 	override fun handleMessage(connection: Int, message: String, arguments: JsonArray): JsonElement? {
 		return when (message.lowercase()) {
-			"startcrafting" -> startCrafting()
-			"stopcrafting" -> stopCrafting()
-			"burncontainercontents" -> burnContainerContents()
+			"startcrafting" -> {
+				startCrafting()
+				JsonNull.INSTANCE
+			}
+
+			"stopcrafting" -> {
+				stopCrafting()
+				JsonNull.INSTANCE
+			}
+
+			"burncontainercontents" -> {
+				burnContainerContents()
+				JsonNull.INSTANCE
+			}
 
 			// returns not inserted items
 			"additems" -> items.add(ItemDescriptor(arguments[0]).build()).toJson()
@@ -219,16 +230,13 @@ class ContainerObject(config: Registry.Entry<ObjectDefinition>) : WorldObject(co
 		}
 	}
 
-	private fun startCrafting(): JsonElement {
-		return JsonNull.INSTANCE
+	private fun startCrafting() {
 	}
 
-	private fun stopCrafting(): JsonElement {
-		return JsonNull.INSTANCE
+	private fun stopCrafting() {
 	}
 
-	private fun burnContainerContents(): JsonElement {
-		return JsonNull.INSTANCE
+	private fun burnContainerContents() {
 	}
 
 	// Networking of this container to legacy clients is incredibly stupid,
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/tile/TileEntity.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/tile/TileEntity.kt
index 0b9ac562..ca1d087c 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/tile/TileEntity.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/tile/TileEntity.kt
@@ -306,11 +306,6 @@ abstract class TileEntity : AbstractEntity() {
 				} else {
 					clear = false
 				}
-			} else {
-				// bugger, someone rooted onto our tile!
-				// will try again...
-				// TODO: however, shouldn't we just ignore this and move on?
-				clear = false
 			}
 		}
 
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/world/terrain/TerrainSelectorType.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/world/terrain/TerrainSelectorType.kt
index bcc018f1..cb939b6c 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/world/terrain/TerrainSelectorType.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/world/terrain/TerrainSelectorType.kt
@@ -15,6 +15,7 @@ import ru.dbotthepony.kommons.gson.value
 import ru.dbotthepony.kstarbound.Registries
 import ru.dbotthepony.kstarbound.Starbound
 import ru.dbotthepony.kstarbound.defs.world.TerrainSelectorParameters
+import ru.dbotthepony.kstarbound.json.fromJsonTreeFast
 
 private inline fun <reified D : Any, T : AbstractTerrainSelector<D>> data(noinline factory: (D, TerrainSelectorParameters) -> T): Data<D, T> {
 	return Data(TypeToken.get(D::class.java), factory)
@@ -83,13 +84,13 @@ enum class TerrainSelectorType(val jsonName: String, private val data: Data<*, *
 
 				for (value in entries) {
 					if (value.lowercase == type) {
-						return Factory(value.data.adapter.fromJsonTree(config), value.data.factory as ((Any, TerrainSelectorParameters) -> AbstractTerrainSelector<Any>))
+						return Factory(value.data.adapter.fromJsonTreeFast(config), value.data.factory as ((Any, TerrainSelectorParameters) -> AbstractTerrainSelector<Any>))
 					}
 				}
 			} else {
 				for (value in entries) {
 					if (value.lowercase == type) {
-						return Factory(value.data.adapter.fromJsonTree(json), value.data.factory as ((Any, TerrainSelectorParameters) -> AbstractTerrainSelector<Any>))
+						return Factory(value.data.adapter.fromJsonTreeFast(json), value.data.factory as ((Any, TerrainSelectorParameters) -> AbstractTerrainSelector<Any>))
 					}
 				}
 			}