You will first have to identify the underlying cause and then choose the appropriate fix. Thus a sole fix wouldn’t resolve the issue either. There’s no single reason behind the high CPU usage on a Windows 11 PC. This not just affects the system performance, but a heated system can damage the various components. The system will heat up while the CPU fan works on full throttle. Apart from that, any webpage you open will take a lot longer. When your system’s CPU usage is high, it leads to apps lagging, being unresponsive, or crashing altogether. Execute these quick and simple fixes to resolve the high CPU usage issue. A high CPU usage affects the performance and heats the system.