A small update: I switched to Windows 11 over the holidays and I have been using it for 3 weeks now. While there are many annoyances with the user interface or the absence of settings you were allowed to change before, most of the performance parts were just that it "feels" slower.
But now I can report one massive verifiable performance hit:
- I regularly have to record screen-casts. I always first record them using my GPU in 4K resolution and in "h264" format (only 1-2% CPU load). After that I use FFMPEG and my CPU to scale them down to Full-HD and encode them into the "x265" format.
- On Windows 10 FFMPEG is able to do the CPU-only encoding with a speed of "4.35x", which means it takes around 21 minutes to encode the 90 minute source video to "x265".
- On Windows 10 my total CPU load is at 50% (50% of the cores at 100% load, FFMPEG doesn't use SMT cores for optimal cache usage)
- On Windows 11 the same procedure only gets to speed "1.69x" which means it takes around 53 minutes to encode the same 90 minute source video.
- On Windows 11 my total CPU load just gets to 20% (50% of the cores are used, but all of them are just at 35-50% load)
Wasn't Windows 11 supposed to have an
improved scheduler? I think I will switch back to Windows 10 the next time I have a few free days.