If you hear your computer's fans whirring more loudly than usual or notice a significant slowdown in performance, check your Task Manager. You might see that a process called Ntoskrnl.exe is using a large portion of your CPU's resources.
How to Fix Ntoskrnl.exe's High CPU Usage on Windows
Ntoskrnl.exe is a vital process for your Windows PC, but there are still ways to reduce how much CPU it uses up.