Explanation
Removing the user-installed antivirus software program is the best way to resolve the issue of extremely slow performance caused by installing additional real-time protection antivirus software on a PC. Having more than one antivirus software program running at the same time can cause conflicts, resource consumption and performance degradation. Uninstalling one antivirus software program and installing a different one, activating real-time protection on both antivirus software programs, enabling the quarantine feature on both antivirus software programs and launching Windows Update are not effective ways to resolve the issue. Verified References:
https://www.comptia.org/blog/why-you-shouldnt-run-multiple-antivirus-programs-at-the-same-time
https://www.comptia.org/certifications/a