ez wait

local o_clock = os.clock
local c_yield = coroutine.yield
local c_running = coroutine.running                        -- note for line 9:
local c_resume = coroutine.resume                          -- identical to "for Idx, data in pairs(Yields) do"

local Yields = {}
game:GetService('RunService').Stepped:Connect(function()   -- every frame it runs this:
	local Clock = o_clock()                                     -- the curtime is saved, with high precision (micro)
	for Idx, data in next, Yields do                            -- let's check on all the waits right now:
		local Spent = Clock - data[1]                                -- the elpsdtime is set to curtime minus starttime
		if Spent >= data[2] then                                     -- if the elpsdtime achieves the waittime, then:
			Yields[Idx] = nil                                             -- clear the sent data
			c_resume(data[3], Spent, Clock)                               -- resume the running function
		end                                                          -- end
	end                                                         -- end
end)                                                       -- end

return function(Time)
	Time = (type(Time) ~= 'number' or Time < 0) and 0 or Time   -- if given a bad time value, it doesn't wait
	table.insert(Yields, {o_clock(), Time, c_running()})        -- sends the starttime, waittime, and running function
	return c_yield()                                            -- stops the running function
end







Some more info (not part of the code):
Heya. This is a module for Luau (i.e. Roblox) that optimizes the wait() command. All of these lines of code were written by Pyseph, but I have marked them up for personal viewing. Here is where I found this:
https://devforum.roblox.com/t/custom-wait-the-best-solution-to-yielding/715274
Again, I didn't write this. This is Pyseph's work.

Suerte!