Every time i interact with the UI, usually the library interface, it has moments where it freezes for a second or two. Doesn't seem to be having a big spike in system monitor- tried turning off background shader processing yesterday and it stopped, but it came back today.
Solution
I might guess it's hardware acceleration in steam.
Old guide, but things should be in similar places. You can turn off hardware acceleration and see if it helps. But be warned, turning off hw acceleration will make things like gifs/videos more CPU heavy.
GPU Accelerated Rendering is a feature that Steam offers with almost all new generation games and some specific video editing apps. This feature improves the