In Blender 2.92, I have
Prefetch Frames enabled in the Video Sequence Editor, and a
Memory Cache Limit of 16384 in the
Video Sequencer >
Memory Cache System settings. I've closed and reopened Blender and rebooted, but still don't see an orange stripe in the sequencer indicating that frames are being prefetched (and I do get some performance/framerate issues during playback).
Is there any reason prefetch would be working but not displaying the orange indicator stripe? Do I have to enable that in the display? Based on the performance issues it would seem that prefetch is just not working...
Edit: I should also say that I am splicing mp4's together that I recorded from my camera. It's a fairly simple setup...