Just installed this script today, cpu usage went from 25-40% while watching music videos and such to about 6-30% Depending on the activity of the session such as loading a new page or just having a video playing in the background. So far no bugs or conflicts with other scripts/webpages, Very highly recommended especially if your CPU is a current bottle neck for your system.

Edit: I should add im using Brave browser, latest update on a windows 10 system running a AMD FX-6300.