My laptop (New, HP, Windows 10):
Has been slow and bogged down frequently. When I open task manager, I see 90% CPU, system interrupts is most of it. If it's important, usually once I open task manager, the CPU usage drops rapidly.
I've done these things:
1. Disable USB Root Hubs one by one. No change
2. Reboot into safe mode. No change
3. Disable your network adapters. No change.
4. Disable wireless altogether. No change.
I was looking at this page: https://superuser.com/questions/1378289/system-interrupts-process-using-high-cpu
and I've downloaded and run LatencyMon. I'm not sure if the Directx Graphics kernel is running high or not, I'm not sure what's normal. This is after a about a minute.