Question
Photoshop Timeline preview resolution doesn't change
In Photoshop's Timeline, there's an option to chose the resolution of the playback preview.
It can be set to 100% or 50% or 25%.
However, it's been a few updates now that this resolution option doesn't work. Photoshop now only previews at 100%, even when choosing 50% or 25%. This can slow down the playback speed.

