should be good

benches/visual/spawn.bench.lua

@@ -2,41 +2,37 @@
 --!native
 
 local ReplicatedStorage = game:GetService("ReplicatedStorage")
-local rgb = require(ReplicatedStorage.rgb)
 local Matter = require(ReplicatedStorage.DevPackages.Matter)
-local jecs = require(ReplicatedStorage.Lib)
 local ecr = require(ReplicatedStorage.DevPackages.ecr)
+local jecs = require(ReplicatedStorage.Lib)
+local rgb = require(ReplicatedStorage.rgb)
 local newWorld = Matter.World.new()
 local ecs = jecs.World.new()
 
-
 return {
 	ParameterGenerator = function()
 		local registry2 = ecr.registry()
 
 		return registry2
-	end,
+	end;
 
 	Functions = {
 		Matter = function()
 			for i = 1, 1000 do
 				newWorld:spawn()
 			end
-		end,
+		end;
-
 
 		ECR = function(_, registry2)
 			for i = 1, 1000 do
 				registry2.create()
 			end
-		end,
+		end;
-
 
 		Jecs = function()
 			for i = 1, 1000 do
 				ecs:entity()
 			end
-		end
+		end;
-
+	};
-	},
 }

lib/init.lua

@@ -470,9 +470,10 @@ function World.query(world: World, ...: i53): Query
 		local withoutComponents = {...}
 		for index = #compatibleArchetypes, 1, -1 do
 			local archetype = compatibleArchetypes[index][1]
+			local records = archetype.records
 			local shouldRemove = false
 			for _, componentId in withoutComponents do
-				if archetype.records[componentId] then
+				if records[componentId] then
 					shouldRemove = true
 					break
 				end
@@ -634,15 +635,23 @@ function World.observer(world: World, ...)
 				end
 
 				local queryOutput = {}
+				local length = 0
+
 				local row = change.offset
 				local archetype = change.archetype
 				local columns = archetype.columns
 				local archetypeRecords = archetype.records
 				for _, id in componentIds do
-					table.insert(queryOutput, columns[archetypeRecords[id]][row])
+					local value = columns[archetypeRecords[id]][row]
+					if value == nil then
+						continue
 					end
 
-				return archetype.entities[row], unpack(queryOutput, 1, #queryOutput)
+					length += 1
+					queryOutput[length] = value
+				end
+
+				return archetype.entities[row], unpack(queryOutput, 1, length)
 			end
 		end;
 	}