CSRSS Using 100% GPU Freezing PC

Over the past couple of weeks I have been experiencing either severe lagging or complete freezing of my pc. In task manager the culprit seems to be Client Server Runtime Process (gpu 0 - 3d), which is located in the Windows 32 folder as CSRSS, using upto 100% of the gpu. This seems to happen randomly, even when the pc is idle.

When I use the mouse wheel for scrolling on a website, then the Client Server Runtime process immediately uses the gpu at between 30% and 40%. I turned of hardware acceleration in Firefox, but this doesn't seem to have made a difference. Anyway, the pc will sometimes freeze without a browser open.

I am also sometimes get 100% CPU from System Interrupts.

During this time there have been updates from Windows and Nvidia (GeForce GTX950).

Windows 10, version 21H1 (OS build 19043.1237)

It sounds like you may have gotten some malware; those processes should not be taking that much resources. Download the free version of Malwarebytes https://www.malwarebytes.com/mwb-download install it then run a custom scan include all hard drives on your PC. Malwarebytes Basics - How to Scan for Viruses & Other Malware - YouTube

Thanks jgtech. I already use Malwarebytes, it's found nothing. Although a while ago, Windows quarantined a Lodi trojan. Perhaps some malware is still lurking undetected. I'll try a couple of other antimalware progs when I return at the end of the month.