Comment by Momquist

If you have a nvidia GPU, then it may well be the fault of the latest drivers (390.25), which have been buggy, and it's especially notable under Chrome/Chromium (video/audio stuttering, problems with vsync, general slowness, high CPU usage, etc..).

Arch has a recent thread about it: https://bbs.archlinux.org/viewtopic.php?id=234241