I have the same problem. But I would say more - it's not just video playback. It feels like whole embedded chromium works terribly slowly.
In my case:
Problems:
Some other related issue is https://github.com/ValveSoftware/steam-for-linux/issues/4653.
But, I explicitly disabled compositing. It doesn't help.
It used to work well in a past, unfortnately I cannot pinpoint the time where it stopped working well. I tried Steam Beta but it behaves identically.
Hello @garrett85, @reavertm, are either of you still experiencing this issue on an up to date system?
Closing pending feedback.
When viewing video game preview in the Steam client the playback is very slow to load and no more than a few seconds at a time will play before it has to buffer. This issue does not exist when view the same video game previews on the Steam site in my browser, only in the client.
OS = Linux Mint.