diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/Main.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/Main.kt
index 928c794c..cc88a75f 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/Main.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/Main.kt
@@ -13,6 +13,7 @@ import ru.dbotthepony.kstarbound.json.VersionedJson
 import ru.dbotthepony.kstarbound.io.readVarInt
 import ru.dbotthepony.kstarbound.util.AssetPathStack
 import ru.dbotthepony.kstarbound.world.api.MutableCell
+import ru.dbotthepony.kstarbound.world.entities.PlayerEntity
 import ru.dbotthepony.kstarbound.world.entities.WorldObject
 import ru.dbotthepony.kvector.vector.Vector2d
 import java.io.BufferedInputStream
@@ -68,13 +69,20 @@ fun main() {
 		Starbound.terminateLoading = true
 	}
 
+	var ply: PlayerEntity? = null
+
 	Starbound.onInitialize {
+		ply = PlayerEntity(client.world!!)
+
+		ply!!.position = Vector2d(225.0, 745.0)
+		ply!!.spawn()
+
 		//for (chunkX in 17 .. 18) {
 		//for (chunkX in 14 .. 24) {
 		for (chunkX in 0 .. 100) {
 		//for (chunkX in 0 .. 17) {
 		//	for (chunkY in 21 .. 21) {
-			for (chunkY in 18 .. 24) {
+			for (chunkY in 0 .. 24) {
 				val data = db.read(byteArrayOf(1, (chunkX shr 8).toByte(), chunkX.toByte(), (chunkY shr 8).toByte(), chunkY.toByte()))
 				val data2 = db.read(byteArrayOf(2, (chunkX shr 8).toByte(), chunkX.toByte(), (chunkY shr 8).toByte(), chunkY.toByte()))
 
@@ -121,7 +129,7 @@ fun main() {
 
 		val rand = Random()
 
-		for (i in 0 until 128) {
+		for (i in 0 until 0) {
 			val item = ItemEntity(client.world!!, Registries.items.keys.values.random().value)
 
 			item.position = Vector2d(225.0 - i, 785.0)
@@ -177,23 +185,22 @@ fun main() {
 	}
 
 	while (client.renderFrame()) {
-		Starbound.pollCallbacks()
-
-		//ent.think(client.frameRenderTime)
-		//client.camera.pos.x = ent.position.x.toFloat()
-		//client.camera.pos.y = ent.position.y.toFloat()
-
-		client.camera.pos += Vector2d(
+		/*client.camera.pos += Vector2d(
 			(if (client.input.KEY_A_DOWN) -Starbound.TICK_TIME_ADVANCE * 32f / client.settings.zoom else 0.0) + (if (client.input.KEY_D_DOWN) Starbound.TICK_TIME_ADVANCE * 32f / client.settings.zoom else 0.0),
 			(if (client.input.KEY_W_DOWN) Starbound.TICK_TIME_ADVANCE * 32f / client.settings.zoom else 0.0) + (if (client.input.KEY_S_DOWN) -Starbound.TICK_TIME_ADVANCE * 32f / client.settings.zoom else 0.0)
-		)
+		)*/
 
-		//println(client.camera.velocity.toDoubleVector() * client.frameRenderTime * 0.1)
+		if (ply != null) {
+			client.camera.pos = ply!!.position
+
+			ply!!.velocity += Vector2d(
+				(if (client.input.KEY_A_DOWN) -Starbound.TICK_TIME_ADVANCE * 32f / client.settings.zoom else 0.0) + (if (client.input.KEY_D_DOWN) Starbound.TICK_TIME_ADVANCE * 32f / client.settings.zoom else 0.0),
+				(if (client.input.KEY_W_DOWN) Starbound.TICK_TIME_ADVANCE * 32f / client.settings.zoom else 0.0) + (if (client.input.KEY_S_DOWN) -Starbound.TICK_TIME_ADVANCE * 32f / client.settings.zoom else 0.0)
+			) * 8.0
+		}
 
 		if (client.input.KEY_ESCAPE_PRESSED) {
 			glfwSetWindowShouldClose(client.window, true)
 		}
-
-		//ent.wantsToDuck = client.input.KEY_DOWN_DOWN
 	}
 }
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/Starbound.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/Starbound.kt
index 579ad95d..31c0cc92 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/Starbound.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/Starbound.kt
@@ -53,6 +53,7 @@ import ru.dbotthepony.kstarbound.util.JVMTimeSource
 import ru.dbotthepony.kstarbound.util.AssetPathStack
 import ru.dbotthepony.kstarbound.util.SBPattern
 import ru.dbotthepony.kstarbound.util.HashTableInterner
+import ru.dbotthepony.kstarbound.util.MailboxExecutorService
 import ru.dbotthepony.kstarbound.util.WriteOnce
 import ru.dbotthepony.kstarbound.util.filterNotNull
 import ru.dbotthepony.kstarbound.util.set
@@ -63,6 +64,7 @@ import java.lang.ref.Cleaner
 import java.text.DateFormat
 import java.util.concurrent.ForkJoinPool
 import java.util.concurrent.ForkJoinTask
+import java.util.concurrent.locks.LockSupport
 import java.util.function.BiConsumer
 import java.util.function.BinaryOperator
 import java.util.function.Function
@@ -76,8 +78,16 @@ object Starbound : ISBFileLocator {
 	const val TICK_TIME_ADVANCE = 0.01666666666666664
 	const val TICK_TIME_ADVANCE_NANOS = 16_666_666L
 
+	val thread = Thread(::universeThread, "Starbound Universe")
+	val mailbox = MailboxExecutorService(thread)
+
+	init {
+		thread.isDaemon = true
+		thread.start()
+	}
+
 	val CLEANER: Cleaner = Cleaner.create {
-		val t = Thread(it, "Starbound Global Cleaner Thread")
+		val t = Thread(it, "Starbound Global Cleaner")
 		t.isDaemon = true
 		t.priority = 2
 		t
@@ -264,6 +274,7 @@ object Starbound : ISBFileLocator {
 		}
 	}
 
+	@Volatile
 	var initializing = false
 		private set
 	var initialized = false
@@ -452,9 +463,9 @@ object Starbound : ISBFileLocator {
 		}
 
 		initializing = true
-		Thread({ doInitialize(log, parallel) }, "Asset Loader").also {
-			it.isDaemon = true
-			it.start()
+
+		mailbox.submit {
+			doInitialize(log, parallel)
 		}
 	}
 
@@ -466,13 +477,19 @@ object Starbound : ISBFileLocator {
 		}
 	}
 
-	fun pollCallbacks() {
-		if (initialized && initCallbacks.isNotEmpty()) {
-			for (callback in initCallbacks) {
-				callback()
+	private fun universeThread() {
+		while (true) {
+			mailbox.executeQueuedTasks()
+
+			if (initialized && initCallbacks.isNotEmpty()) {
+				for (callback in initCallbacks) {
+					callback()
+				}
+
+				initCallbacks.clear()
 			}
 
-			initCallbacks.clear()
+			LockSupport.park()
 		}
 	}
 }
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/client/StarboundClient.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/client/StarboundClient.kt
index 8f19fc62..0083091f 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/client/StarboundClient.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/client/StarboundClient.kt
@@ -80,6 +80,7 @@ import java.util.concurrent.locks.LockSupport
 import java.util.concurrent.locks.ReentrantLock
 import java.util.function.IntConsumer
 import kotlin.collections.ArrayList
+import kotlin.concurrent.withLock
 import kotlin.math.absoluteValue
 import kotlin.math.roundToInt
 
@@ -818,9 +819,11 @@ class StarboundClient : Closeable {
 				viewportLighting.clear()
 				val viewportLightingMem = viewportLightingMem
 
-				world.addLayers(
-					layers = layers,
-					size = viewportRectangle)
+				world.lock.withLock {
+					world.addLayers(
+						layers = layers,
+						size = viewportRectangle)
+				}
 
 				if (viewportLightingMem != null && !fullbright) {
 					val spos = screenToWorld(mouseCoordinates)
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/client/world/ClientWorld.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/client/world/ClientWorld.kt
index 6f3ae8c6..412ddca8 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/client/world/ClientWorld.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/client/world/ClientWorld.kt
@@ -29,6 +29,7 @@ import ru.dbotthepony.kvector.vector.Vector2f
 import ru.dbotthepony.kvector.vector.Vector2i
 import java.util.concurrent.Callable
 import java.util.concurrent.Future
+import kotlin.concurrent.withLock
 
 class ClientWorld(
 	val client: StarboundClient,
@@ -204,11 +205,7 @@ class ClientWorld(
 	val renderRegions = Long2ObjectOpenHashMap<RenderRegion>()
 
 	fun renderRegionKey(x: Int, y: Int): Long {
-		if (size == null) {
-			return x.toLong() shl 32 or y.toLong()
-		} else {
-			return positiveModulo(x, renderRegionsX).toLong() shl 32 or positiveModulo(y, renderRegionsY).toLong()
-		}
+		return positiveModulo(x, renderRegionsX).toLong() shl 32 or positiveModulo(y, renderRegionsY).toLong()
 	}
 
 	/**
@@ -242,13 +239,18 @@ class ClientWorld(
 				val index = renderRegionKey(ix, iy)
 
 				if (seen.add(index)) {
-					renderRegions[index]?.let(action)
+					lock.withLock {
+						renderRegions[index]?.let(action)
+					}
 				}
 			}
 		} else {
 			val ix = pos.component1() / renderRegionWidth
 			val iy = pos.component2() / renderRegionHeight
-			renderRegions[renderRegionKey(ix, iy)]?.let(action)
+
+			lock.withLock {
+				renderRegions[renderRegionKey(ix, iy)]?.let(action)
+			}
 		}
 	}
 
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/util/KOptional.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/util/KOptional.kt
index f5a1f61f..a144bdb8 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/util/KOptional.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/util/KOptional.kt
@@ -25,10 +25,20 @@ class KOptional<T> private constructor(private val _value: T, val isPresent: Boo
 		throw NoSuchElementException("No value is present")
 	}
 
-	inline fun ifPresent(block: (T) -> Unit) {
+	inline fun ifPresent(block: (T) -> Unit): KOptional<T> {
 		if (isPresent) {
 			block.invoke(value)
 		}
+
+		return this
+	}
+
+	inline fun ifNotPresent(block: () -> Unit): KOptional<T> {
+		if (!isPresent) {
+			block.invoke()
+		}
+
+		return this
 	}
 
 	inline fun <R> map(block: (T) -> R): KOptional<R> {
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/world/Chunk.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/world/Chunk.kt
index f5d68009..a5a88b69 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/world/Chunk.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/world/Chunk.kt
@@ -142,7 +142,7 @@ abstract class Chunk<WorldType : World<WorldType, This>, This : Chunk<WorldType,
 	protected open fun onEntityRemoved(entity: Entity) { }
 
 	fun addEntity(entity: Entity) {
-		world.entityListsLock.withLock {
+		world.lock.withLock {
 			if (!entities.add(entity)) {
 				throw IllegalArgumentException("Already having having entity $entity")
 			}
@@ -153,7 +153,7 @@ abstract class Chunk<WorldType : World<WorldType, This>, This : Chunk<WorldType,
 	}
 
 	fun transferEntity(entity: Entity, otherChunk: Chunk<*, *>) {
-		world.entityListsLock.withLock {
+		world.lock.withLock {
 			if (otherChunk == this)
 				throw IllegalArgumentException("what?")
 
@@ -176,7 +176,7 @@ abstract class Chunk<WorldType : World<WorldType, This>, This : Chunk<WorldType,
 	}
 
 	fun removeEntity(entity: Entity) {
-		world.entityListsLock.withLock {
+		world.lock.withLock {
 			if (!entities.remove(entity)) {
 				throw IllegalArgumentException("Already not having entity $entity")
 			}
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/world/World.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/world/World.kt
index 64222808..64aab434 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/world/World.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/world/World.kt
@@ -1,7 +1,5 @@
 package ru.dbotthepony.kstarbound.world
 
-import com.google.common.collect.ImmutableList
-import it.unimi.dsi.fastutil.ints.IntList
 import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap
 import it.unimi.dsi.fastutil.objects.ObjectArrayList
 import it.unimi.dsi.fastutil.objects.ReferenceLinkedOpenHashSet
@@ -16,19 +14,18 @@ import ru.dbotthepony.kstarbound.world.entities.Entity
 import ru.dbotthepony.kstarbound.world.entities.WorldObject
 import ru.dbotthepony.kstarbound.world.physics.CollisionPoly
 import ru.dbotthepony.kstarbound.world.physics.CollisionType
-import ru.dbotthepony.kstarbound.world.physics.Poly
 import ru.dbotthepony.kstarbound.world.physics.getBlockPlatforms
 import ru.dbotthepony.kstarbound.world.physics.getBlocksMarchingSquares
 import ru.dbotthepony.kvector.api.IStruct2d
 import ru.dbotthepony.kvector.api.IStruct2i
 import ru.dbotthepony.kvector.arrays.Object2DArray
 import ru.dbotthepony.kvector.util2d.AABB
-import ru.dbotthepony.kvector.util2d.AABBi
 import ru.dbotthepony.kvector.vector.Vector2d
 import ru.dbotthepony.kvector.vector.Vector2i
 import java.util.concurrent.ForkJoinPool
 import java.util.concurrent.locks.ReentrantLock
 import java.util.random.RandomGenerator
+import kotlin.concurrent.withLock
 
 abstract class World<This : World<This, ChunkType>, ChunkType : Chunk<This, ChunkType>>(
 	val seed: Long,
@@ -117,7 +114,14 @@ abstract class World<This : World<This, ChunkType>, ChunkType : Chunk<This, Chun
 
 		override fun compute(x: Int, y: Int): ChunkType? {
 			if (!this@World.x.inBoundsChunk(x) || !this@World.y.inBoundsChunk(y)) return null
-			return map[ChunkPos.toLong(x, y)] ?: create(x, y).also { map[ChunkPos.toLong(x, y)] = it }
+
+			val index = ChunkPos.toLong(x, y)
+
+			val get = map[index] ?: lock.withLock {
+				map[index] ?: create(x, y).also { map[index] = it }
+			}
+
+			return get
 		}
 
 		override fun setCell(x: Int, y: Int, cell: AbstractCell): Boolean {
@@ -126,7 +130,14 @@ abstract class World<This : World<This, ChunkType>, ChunkType : Chunk<This, Chun
 			val iy = this@World.y.cell(y)
 			val cx = this@World.x.chunkFromCell(ix)
 			val cy = this@World.y.chunkFromCell(iy)
-			return (map[ChunkPos.toLong(cx, cy)] ?: create(cx, cy).also { map[ChunkPos.toLong(cx, cy)] = it }).setCell(ix and CHUNK_SIZE_MASK, iy and CHUNK_SIZE_MASK, cell)
+
+			val index = ChunkPos.toLong(cx, cy)
+
+			val get = map[index] ?: lock.withLock {
+				map[index] ?: create(cx, cy).also { map[index] = it }
+			}
+
+			return get.setCell(ix and CHUNK_SIZE_MASK, iy and CHUNK_SIZE_MASK, cell)
 		}
 
 		override fun remove(x: Int, y: Int) {
@@ -138,7 +149,7 @@ abstract class World<This : World<This, ChunkType>, ChunkType : Chunk<This, Chun
 		private val map = Object2DArray.nulls<ChunkType>(divideUp(size.x, CHUNK_SIZE), divideUp(size.y, CHUNK_SIZE))
 
 		private fun getRaw(x: Int, y: Int): ChunkType {
-			return map[x, y] ?: create(x, y).also { map[x, y] = it }
+			return map[x, y] ?: lock.withLock { map[x, y] ?: create(x, y).also { map[x, y] = it } }
 		}
 
 		override fun compute(x: Int, y: Int): ChunkType? {
@@ -176,13 +187,13 @@ abstract class World<This : World<This, ChunkType>, ChunkType : Chunk<This, Chun
 	var gravity = Vector2d(0.0, -EARTH_FREEFALL_ACCELERATION)
 	abstract val isClient: Boolean
 
-	// used by world chunks to synchronize entity additions/transfer
-	val entityListsLock = ReentrantLock()
+	// used to synchronize read/writes to various world state stuff/memory structure
+	val lock = ReentrantLock()
 
 	fun think() {
 		try {
 			mailbox.executeQueuedTasks()
-			val entities = ObjectArrayList(entities)
+			val entities = lock.withLock { ObjectArrayList(entities) }
 			ForkJoinPool.commonPool().submit(ParallelPerform(entities.spliterator(), Entity::move)).join()
 			mailbox.executeQueuedTasks()
 
@@ -195,7 +206,8 @@ abstract class World<This : World<This, ChunkType>, ChunkType : Chunk<This, Chun
 					ent.thinkServer()
 			}
 
-			val objects = ObjectArrayList(objects)
+			mailbox.executeQueuedTasks()
+			val objects = lock.withLock { ObjectArrayList(objects) }
 
 			for (ent in objects) {
 				ent.thinkShared()
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/Entity.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/Entity.kt
index 460e6de8..be4e15e1 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/Entity.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/Entity.kt
@@ -38,7 +38,7 @@ abstract class Entity(val world: World<*, *>) {
 			val oldChunk = field
 			field = value
 
-			world.entityListsLock.withLock {
+			world.lock.withLock {
 				if (oldChunk == null && value != null) {
 					world.orphanedEntities.remove(this)
 					value.addEntity(this)
@@ -107,11 +107,14 @@ abstract class Entity(val world: World<*, *>) {
 			throw IllegalStateException("Already spawned")
 
 		isSpawned = true
-		world.entities.add(this)
-		chunk = world.chunkMap[world.chunkFromCell(position)]
 
-		if (chunk == null) {
-			world.orphanedEntities.add(this)
+		world.mailbox.execute {
+			world.entities.add(this)
+			chunk = world.chunkMap[world.chunkFromCell(position)]
+
+			if (chunk == null) {
+				world.orphanedEntities.add(this)
+			}
 		}
 	}
 
@@ -123,8 +126,10 @@ abstract class Entity(val world: World<*, *>) {
 		mailbox.shutdownNow()
 
 		if (isSpawned) {
-			world.entities.remove(this)
-			chunk?.removeEntity(this)
+			world.mailbox.execute {
+				world.entities.remove(this)
+				chunk?.removeEntity(this)
+			}
 		}
 	}
 
@@ -163,7 +168,7 @@ abstract class Entity(val world: World<*, *>) {
 			return
 		}
 
-		val steps = roundTowardsPositiveInfinity(velocity.length / 30.0 / hitboxes.stream().map { it.aabb }.reduce(AABB::combine).get().let { it.width.coerceAtLeast(it.height).coerceAtLeast(0.1) })
+		val steps = roundTowardsPositiveInfinity(velocity.length / 10.0 / hitboxes.stream().map { it.aabb }.reduce(AABB::combine).get().let { it.width.coerceAtLeast(it.height).coerceAtLeast(0.1) })
 		val dt = Starbound.TICK_TIME_ADVANCE / steps
 
 		for (step in 0 until steps) {
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/PlayerEntity.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/PlayerEntity.kt
new file mode 100644
index 00000000..03ddb93b
--- /dev/null
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/PlayerEntity.kt
@@ -0,0 +1,19 @@
+package ru.dbotthepony.kstarbound.world.entities
+
+import ru.dbotthepony.kstarbound.GlobalDefaults
+import ru.dbotthepony.kstarbound.Starbound
+import ru.dbotthepony.kstarbound.world.World
+import ru.dbotthepony.kstarbound.world.physics.Poly
+
+class PlayerEntity(world: World<*, *>) : Entity(world) {
+	init {
+		movementParameters = GlobalDefaults.playerMovementParameters
+
+		GlobalDefaults.playerMovementParameters.standingPoly.ifPresent {
+			//hitboxes.add(it)
+			hitboxes.add(Starbound.gson.fromJson("""[ [0.5625, 1.9375], [1.0625, 1.4375], [1.0625, -2.5625], [0.5625, -3.0625], [-0.5625, -3.0625], [-1.0625, -2.5625], [-1.0625, 1.4375], [-0.5625, 1.9375] ]""", Poly::class.java))
+		}.ifNotPresent {
+			throw IllegalStateException("No player collision poly")
+		}
+	}
+}
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/WorldObject.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/WorldObject.kt
index 4bc6abe0..11cc03e6 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/WorldObject.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/WorldObject.kt
@@ -23,6 +23,7 @@ import ru.dbotthepony.kstarbound.world.World
 import ru.dbotthepony.kstarbound.world.api.TileColor
 import ru.dbotthepony.kvector.vector.RGBAColor
 import ru.dbotthepony.kvector.vector.Vector2i
+import kotlin.concurrent.withLock
 
 open class WorldObject(
 	val world: World<*, *>,
@@ -48,7 +49,7 @@ open class WorldObject(
 		}
 	}
 
-	val mailbox = MailboxExecutorService()
+	val mailbox = MailboxExecutorService(world.mailbox.thread)
 
 	//
 	// internal runtime properties
@@ -129,16 +130,22 @@ open class WorldObject(
 	fun spawn() {
 		if (isSpawned) return
 		isSpawned = true
-		world.objects.add(this)
-		innerSpawn()
-		invalidate()
+
+		world.mailbox.execute {
+			world.objects.add(this)
+			innerSpawn()
+			invalidate()
+		}
 	}
 
 	open fun remove() {
 		if (isRemoved || !isSpawned) return
 		isRemoved = true
-		check(world.objects.remove(this))
-		innerRemove()
+
+		world.mailbox.execute {
+			check(world.objects.remove(this))
+			innerRemove()
+		}
 	}
 
 	open fun thinkShared() {