RBXPrintChangesAddsRemoves.lua

local mode = 0  -- 0 is ClassName, 1 is Name, 2 is parent, 3 is FullName
local printRate = 60  -- set to math.huge to disable
-- You can add a BindableEvent named PrintStats to this script and fire it to print stats

---

local changes = {}
local GetFullName = workspace.GetFullName
game.ItemChanged:connect(function(item, prop)
	local n = ""
	if mode == 2 then
		pcall(function()
			n = n..item.Parent.Name.."."
		end)
	end
	pcall(function()  -- Sometimes this will fire on RobloxLocked instances!
		n =
			(mode  == 0 and item.ClassName)
			or (mode <= 2 and tostring(item))  -- tostring works on RobloxLocked instances.
			or (mode == 3 and GetFullName(item))
	end)
	n = n.."."..prop
	changes[n] = (changes[n] or 0) + 1
end)
local adds = {}
game.DescendantAdded:connect(function(item)
	local n = ""
	if mode == 2 then
		pcall(function()
			n = n..item.Parent.Name.."."
		end)
	end
	pcall(function()  -- Sometimes this will fire on RobloxLocked instances!
		n =
			(mode  == 0 and item.ClassName)
			or (mode <= 2 and tostring(item))  -- tostring works on RobloxLocked instances.
			or (mode == 3 and GetFullName(item))
	end)
	adds[n] = (adds[n] or 0) + 1
end)
local removes = {}
game.DescendantRemoving:connect(function(item)
	local n = ""
	if mode == 2 then
		pcall(function()
			n = n..item.Parent.Name.."."
		end)
	end
	pcall(function()  -- Sometimes this will fire on RobloxLocked instances!
		n =
			(mode  == 0 and item.ClassName)
			or (mode <= 2 and tostring(item))  -- tostring works on RobloxLocked instances.
			or (mode == 3 and GetFullName(item))
	end)
	removes[n] = (removes[n] or 0) + 1
end)

local frms = 0

game:GetService("RunService"):BindToRenderStep("logFrames", Enum.RenderPriority.First.Value, function()
	frms = frms + 1
end)

local printFunc = function()
	do
		print(("\n"):rep(6).."Adds:")
		local t = {}
		local maxNameLength = 0
		for k, v in next, adds do
			maxNameLength = math.max(maxNameLength, #k)
			t[#t + 1] = {k, v}
		end
		table.sort(t, function(a, b)
			return a[2] < b[2]
		end)
		for i = 1, #t do
			local n = t[i][1]
			n = n..(" "):rep(maxNameLength - #n)
			print(" - ", n..": "..t[i][2]..";  "..(math.floor(t[i][2]/frms*10)/10).." per frame")
		end
	end
	do
		print(("\n"):rep(6).."Removes:")
		local t = {}
		local maxNameLength = 0
		for k, v in next, removes do
			maxNameLength = math.max(maxNameLength, #k)
			t[#t + 1] = {k, v}
		end
		table.sort(t, function(a, b)
			return a[2] < b[2]
		end)
		for i = 1, #t do
			local n = t[i][1]
			n = n..(" "):rep(maxNameLength - #n)
			print(" - ", n..": "..t[i][2]..";  "..(math.floor(t[i][2]/frms*10)/10).." per frame")
		end
	end
	do
		print(("\n"):rep(6).."Changes:")
		local t = {}
		local maxNameLength = 0
		for k, v in next, changes do
			maxNameLength = math.max(maxNameLength, #k)
			t[#t + 1] = {k, v}
		end
		table.sort(t, function(a, b)
			return a[2] < b[2]
		end)
		for i = 1, #t do
			local n = t[i][1]
			n = n..(" "):rep(maxNameLength - #n)
			print(" - ", n..": "..t[i][2]..";  "..(math.floor(t[i][2]/frms*10)/10).." per frame")
		end
	end
end

if script:FindFirstChild("PrintStats") then
	script.PrintStats.Event:connect(printFunc)
end

while wait(printRate) do
	printFunc()
end