MsMpEng.exe can slow down your PC by consuming 100% CPU.
- Add Exclusion: Go to Windows Security -> Virus & threat protection -> Manage settings -> Exclusions. Add the
MsMpEng.exefile. - Reschedule Scans: Use Task Scheduler to ensure Windows Defender only scans when you are not using the PC.
- Use a Light Browser: Browsing with AdsPower also helps manage background processes more efficiently if you are a power user.