How do i make a part face another part?

I've recently been trying to create a script that'll make one part face another indefinitely. When i have been looking for an answer for this question the most popular answer seems to be a bit like this:

part1.CFrame = CFrame.new(part1.Position, part2.Positon)

But it doesn't seem to work anymore. Then i tried using math.atan2 to solve my problems but it heavily lags the game trying to do it atleast 10 times per second.

Is there any simple solutions that i've missed?