Instance.new() with parent argument

local instance_new,queue = Instance.new
local mutex = Instance.new("BindableEvent")
coroutine.resume(coroutine.create(function()
    while true do
        mutex.Event:wait()
        coroutine.yield()
        for obj,parent in pairs(queue) do
            obj.Parent = parent
        end queue = nil
    end
end))
Instance = {
    new = function(class,parent)
        local obj = instance_new(class)
        if not parent then return obj end
        if queue then
            queue[obj] = parent
        else
            queue = {[obj]=parent}
            mutex:Fire()
        end return obj
    end;
}

-- localize, otherwise indexing might influence results
local oldNew,newNew = instance_new,Instance.new
-- easier to clean up
local model = Instance.new("Folder",workspace)
-- needed for a quick test at the bottom
local wall

local t = tick()
for i=1,100 do
    wall = oldNew("Part")
    wall.Anchored = true
    wall.Size = Vector3.new(10,10,1)
    wall.CFrame = CFrame.new()
    wall.Parent = model
end
print(tick()-t)

model:ClearAllChildren() wait(1) -- clean up

local t = tick()
for i=1,100 do
    wall = oldNew("Part",model)
    wall.Anchored = true
    wall.Size = Vector3.new(10,10,1)
    wall.CFrame = CFrame.new()
end
print(tick()-t)

model:ClearAllChildren() wait(1) -- clean up

local t = tick()
for i=1,100 do
    wall = newNew("Part",model)
    wall.Anchored = true
    wall.Size = Vector3.new(10,10,1)
    wall.CFrame = CFrame.new()
end
print(tick()-t)

local diff = tick()-t -- correction below

print(wall.Parent)
local t = tick()
wall.Changed:wait()
print(wall.Parent,tick()-t)

wait() model:Destroy() -- clean up

--[[ Output (ran several times)
0.00055575370788574
0.079145908355713
0.00058746337890625
nil
Folder 0.0012581348419189

0.0005803108215332
0.07579493522644
0.00054287910461426
nil
Folder 0.00094771385192871

0.00053167343139648
0.078535318374634
0.00054073333740234
nil
Folder 0.0022518634796143

0.00056672096252441
0.079301595687866
0.00054311752319336
nil
Folder 0.001467227935791

0.00053739547729492
0.075802326202393
0.00056886672973633
nil
Folder 0.0021722316741943
--]]