Okay so many people seem to have had this issue with their GPD win and @Maniac
's solution for turning of the intel thermal processes in the BIOS have worked for some and have, unfortunately, not worked for others.
I recently started experiencing crashes on Grid Autosport which I was playing off of a flash disk and after a couple of days of searching on the internet, I tried all kinds of solutions by configuring the game and changing display settings etc, none of which worked until this solution came up on some forum:http://boards.dingoonity.org/gpd-windows-devices/grid-autosport-crash-on-gpd-win/
I had previously managed to diagnose through xperf that the high system SPU usage was due to the touchscreen driver
(see here- http://boards.dingoonity.org/gpd-windows-devices/post-hibernate-cpu-usage-any-reliable-fix/
) but wasn't sure of what my next step should be.
Anyway, cutting to the chase, here's what you need to do:
Go to the task manager-> services-> open services-> Touch Keyboard and Handwriting Panel Service-> Stop (or preferably, disable) this service et voi-f**king-la!
CPU usage will stay put at 0-1 % (could be little higher based on how many processes you've got going on your device) even after resuming from sleep/ hibernate.
I hope this helps fix the issue for some people- as we learnt from other possible solutions, the causes for high system CPU can be many but this is definitely one fix.
EDIT- I shoudl point out that with this service disable you'll lose access to on-screen keyboard-- didn't matter sh*t to me but just putting it out there.