diff --git a/lua/d3bot/1_navmesh_sv.lua b/lua/d3bot/1_navmesh_sv.lua
index 23f9f9d5..1ac75f8a 100644
--- a/lua/d3bot/1_navmesh_sv.lua
+++ b/lua/d3bot/1_navmesh_sv.lua
@@ -15,29 +15,68 @@ return function(lib)
 		return file.Exists(lib.GetMapNavMeshPath(mapName), "DATA")
 	end
 	
-	util.AddNetworkString(lib.MapNavMeshNetworkStr)
-	function lib.UploadMapNavMesh(plOrPls)
-		local rawData = util.Compress(lib.MapNavMesh:Serialize()) or ""
-		local dataLen = rawData:len()
-		local maxChunkSize = 2^16 - 10 -- Leave 10 bytes for other stuff than the data.
+	local uploadQueue = {}
+	local uploadWorker = nil
+	local uploading = false
+	
+	local NextTick = 0
+	local function MapNavMeshUpload()
+		if NextTick > CurTime() then return end
+		NextTick = CurTime() + 0.2
 
-		for i = 1, dataLen, maxChunkSize do
-			local dataLeft = dataLen + 1 - i
-			local chunkSize = math.min(maxChunkSize, dataLeft)
-			local subDataComp = string.sub(rawData, i, i + chunkSize - 1)
+		local running, err = D3bot.Async.Run(uploadWorker, function(worker)
+			local rawData = util.Compress(lib.MapNavMesh:Serialize()) or ""
+			local dataLen = rawData:len()
+			local maxChunkSize = 2^16 - 10 -- Leave 10 bytes for other stuff than the data.
+			
+			for i = 1, dataLen, maxChunkSize do
+				local dataLeft = dataLen + 1 - i
+				local chunkSize = math.min(maxChunkSize, dataLeft)
+				local subDataComp = string.sub(rawData, i, i + chunkSize - 1)
+	
+				net.Start(lib.MapNavMeshNetworkStr, false)
+				net.WriteBool(false)
+				net.WriteUInt(chunkSize, 16)
+				net.WriteData(subDataComp, chunkSize)
+				net.Send(worker:GetData())
 
+				coroutine.yield()
+			end
+			
+			-- Finish the transfer.
 			net.Start(lib.MapNavMeshNetworkStr, false)
-			net.WriteBool(false)
-			net.WriteUInt(chunkSize, 16)
-			net.WriteData(subDataComp, chunkSize)
-			net.Send(plOrPls)
+			net.WriteBool(true)
+			net.WriteUInt(0, 16)
+			net.Send(worker:GetData())
+		end)
+
+		if err then
+			print(string.format("D3bot: Navmesh upload worker failed: %s", err))
+		end
+
+		if not running then
+			if not uploadQueue[1] then
+				hook.Remove("Think", "d3bot.MapNavMeshUpload")
+				uploading = false
+			elseif uploadWorker:GetFinished() then
+				uploadWorker = D3bot.Async.CreateWorker()
+				uploadWorker:SetData(table.remove(uploadQueue, 1))
+				uploading = true
+			end
 		end
+	end
 
-		-- Finish the transfer.
-		net.Start(lib.MapNavMeshNetworkStr, false)
-		net.WriteBool(true)
-		net.WriteUInt(0, 16)
-		net.Send(plOrPls)
+	util.AddNetworkString(lib.MapNavMeshNetworkStr)
+	
+	function lib.UploadMapNavMesh(plOrPls)
+		uploadQueue[#uploadQueue + 1] = plOrPls
+
+		if not uploading then
+			uploadWorker = D3bot.Async.CreateWorker()
+			uploadWorker:SetData(table.remove(uploadQueue, 1))
+			hook.Add("Think", "d3bot.MapNavMeshUpload", MapNavMeshUpload)
+			uploading = true
+		end
 	end
 	
 	file.CreateDir(lib.MapNavMeshDir)
diff --git a/lua/d3bot/2_mapnavmeshui_cl.lua b/lua/d3bot/2_mapnavmeshui_cl.lua
index d8222d83..799afb61 100644
--- a/lua/d3bot/2_mapnavmeshui_cl.lua
+++ b/lua/d3bot/2_mapnavmeshui_cl.lua
@@ -60,6 +60,7 @@ return function(lib)
 		if isEnabled then
 			nodeVisualProperties = {}
 			hook.Add("Think", hooksId, function()
+				if not lib.MapNavMesh then return end
 				cursoredItemOrNil = lib.MapNavMesh:GetCursoredItemOrNil(LocalPlayer())
 				
 				local smartDraw = D3bot.Convar_Navmeshing_SmartDraw:GetBool()
@@ -96,6 +97,7 @@ return function(lib)
 				
 			end)
 			hook.Add("PostDrawOpaqueRenderables", hooksId, function(bDrawingDepth, bDrawingSkybox)
+				if not lib.MapNavMesh then return end
 				if forceDrawInSkyboxCounter > 1 then
 					forceDrawInSkybox = true
 					print("D3bot: Force drawing of navmesh in skybox, it won't draw correctly otherwise.")
@@ -408,6 +410,7 @@ return function(lib)
 				end
 			end)
 			hook.Add("HUDPaint", hooksId, function()
+				if not lib.MapNavMesh then return end
 				local smartDraw = D3bot.Convar_Navmeshing_SmartDraw:GetBool()
 				local maxDrawingDistanceSqr = math.pow(math.min(D3bot.Convar_Navmeshing_DrawDistance:GetInt(), 500), 2)
 				if maxDrawingDistanceSqr <= 0 then maxDrawingDistanceSqr = 500*500 end
diff --git a/lua/d3bot/sh_async.lua b/lua/d3bot/sh_async.lua
index 9fd2eac6..456864af 100644
--- a/lua/d3bot/sh_async.lua
+++ b/lua/d3bot/sh_async.lua
@@ -5,30 +5,74 @@ local ASYNC = D3bot.Async
 ---Runs the given function asynchronously.
 ---This can be used to run blocking functions *seemingly* parallel to other code.
 ---There is no parallelism, so ASYNC.Run has to be called until it returns false, which means the function has ended, or has panicked.
----@param state table @Contains the coroutine and its state. Initialize and reuse an empty table for this.
+---@param worker table @Contains the coroutine and its state. Use a table created with D3bot.CreateWorker()
 ---@param func function @The function to call asynchronously.
 ---@return boolean running
 ---@return string | nil err @The error message, if there was any error.
-function ASYNC.Run(state, func)
+function ASYNC.Run(worker, func)
 	-- Start coroutine on the first call.
-	local cr = state[1]
+	local cr = worker:GetCoroutine()
 	if not cr then
 		cr = coroutine.create(func)
-		state[1] = cr
+		worker:SetCoroutine(cr)
 	end
 
 	-- Resume coroutine, catch and print any error.
-	local succ, msg = coroutine.resume(cr)
+	local succ, msg = coroutine.resume(cr, worker)
 	if not succ then
 		-- Coroutine ended unexpectedly.
-		print(string.format("D3bot: %s failed: %s.", cr, msg))
+		worker:SetFinished()
 		return false, string.format("%s failed: %s", cr, msg)
 	end
 
 	-- Check if the coroutine finished. We will never encounter "running", as we don't call coroutine.status from inside the coroutine.
-	if coroutine.status(cr) ~= "suspended" then
+	if not cr or coroutine.status(cr) ~= "suspended" then
+		worker:SetFinished(true)
 		return false, nil
 	end
 
+	worker:SetActive(true)
+
 	return true, nil
 end
+
+---Defers the given function to be later run asynchronously. This does not immediately start running
+---This can be used to run blocking functions *seemingly* parallel to other code.
+---There is no parallelism, so ASYNC.Run has to be called until it returns false, which means the function has ended, or has panicked.
+---@param worker table @Contains the coroutine and its state. Use a table created with D3bot.CreateWorker()
+---@param func function @The function to call asynchronously.
+---@return boolean created
+function ASYNC.Defer(worker, func)
+	-- Start coroutine on the first call.
+	local cr = worker:GetCoroutine()
+	if not cr then
+		cr = coroutine.create(func)
+		worker:SetCoroutine(cr)
+	end
+
+	-- Check if the coroutine finished. We will never encounter "running", as we don't call coroutine.status from inside the coroutine.
+	if not cr or coroutine.status(cr) ~= "suspended" then
+		worker:SetFinished(true)
+		return false
+	end
+
+	return true
+end
+
+local WORKER = {}
+WORKER.__index = WORKER
+AccessorFunc(WORKER, "cr", "Coroutine")
+AccessorFunc(WORKER, "active", "Active")
+AccessorFunc(WORKER, "finished", "Finished")
+AccessorFunc(WORKER, "data", "Data")
+
+---Creates a new worker structure for use with 
+---@return table worker
+function ASYNC.CreateWorker()
+	-- cr			the coroutine
+	-- active		shows if the worker has started, it will be set to nil when finished by ASYNC.Run
+	-- finished		shows if the worker has finished, it will be true if the couroutine finishes successfully
+	-- data			ambiguous persistent data (for organization)
+	local newWorker = { cr = nil, active = false, finished = false, data = nil }
+	return setmetatable(newWorker, WORKER)
+end