I'm new to Rush. When editing a set of 4K 30fps clips on my desktop I constantly get jittery / frozen playback when editing. I've noticed that this happens only during high CPU usage. Jumping forwards, backwards and rewinding triggers the high CPU usage. Even stepping forward/backwards frame by frame several times will trigger high CPU. If I wait until the CPU usage drops to zero, I can make a few edits before high CPU starts again. But there is a lot of waiting. Exported video playback is just fine.
The only suggestion I've seen here is to set preview quality to low which I've done.
I'm using a Windows 10 desktop. It's a powerful computer: Intel Xeon, dual-processor, 6 physical cores per CPU, hyperthreading, so 24 logical processors. Quad channel memory. I have a decent but not super-powerful graphics card. Rush does not seem to make any use of the graphics card, and uses less than half of the PC's RAM.
I know 4K is demanding, but I don't see how it would be possible to edit at all on a phone, tablet or slower PC. Am I missing something?
Desktop version, Hardware or GPU, Performance, Preview