scheduler.lua

-- Run in LocalScript context.
-- Move mouse around to see Input event ordering in the output as well.

local RunService = game:GetService("RunService")
local UserInputService = game:GetService("UserInputService")

local lastT = 0

local function FmtTime()
	local t = time()
	local line = t ~= lastT
	lastT = t
	if line then
		print("------------------------")
	end
	return ("%.3f"):format(t)
end

-- Input
UserInputService.InputChanged:Connect(function(input)
	if input.UserInputType == Enum.UserInputType.MouseMovement then
		print(FmtTime(), "Input")
	end
end)

-- Hearbeat
RunService.Heartbeat:Connect(function()
	print(FmtTime(), "Heartbeat")
end)

-- Stepped
RunService.Stepped:Connect(function()
	print(FmtTime(), "Stepped")
end)

-- RenderStepped
RunService.RenderStepped:Connect(function()
	print(FmtTime(), "RenderStepped")
end)

-- Wait
while true do
	task.wait()
	print(FmtTime(), "Wait")
end