- Very periodic, very predictable, always the same, tested with portal 2, monaco, shadow puppeteer, hammerwatch.
- Same regardless if I set the cpu at various min/max clock rates, always low cpu load e.g: 30% @90fps and 10% at 30fps.
- Fresh win8.1 fujitsu siemens T904 with i7-4600U, disabled some crapware but pretty clean out of the box.
It leads to long mouse and keyboard input lag during low fps periods. Seemingly longer than the drop in framerate should warrant.
It's like the scheduler just pauses a lot during the lag period, and doesn't schedule anything much to run.
The machine is very cool, the fan doesn't even run unless I also start some browser tasks in the background.
I have no clue how to solve this. I can see the very nice periodic (and always quite low) cpu load over all 4 hw threads (dualcore * hyperthread).
Screenshots with portal 2 / shadow puppeteer running, fixed cpu clock speed (@75%/50%) (from power settings)
same with or without multithreaded rendering and various other graphics settings, and same in monaco and hammerwatch game as well.
Has anyone seen something like this before? I'm not used to Win8, or Windows at all for that matter. My google-fu is weak, obviously.