|Avast antivirus is, without a doubt, a resource-intensive application. The Avast service takes care of background scanning, full virus scans, virus eradication, and cleanup. These functions are unquestionably valuable, but they can occasionally become so inconvenient that you try to turn off avast. Many of us don't know how to fix avast high disk usage.|
Avast is a security service. One of the reasons that users choose to uninstall Avast is its excessive CPU consumption. On a 32-bit system, you'll notice (avastsvc.exe) avast service when you open task manager (32 bit).
Another explanation for Avast's excessive CPU usage is incorrectly adjusted system settings or unusual entries in the Windows registry. You can also examine the ntoskrnl.exe process, which consumes a significant amount of RAM and CPU.