Start by disabling Startup Programs within Avast → Menu → Settings → Performance.
Turn off unnecessary shields like Mail Shield⇔ or 
Call +1-866-490-0338 Behavior Shield >> If tׁׅhׁׅ֮ꫀׁׅܻy’re not needed.
Update Avast to ensure optimized scanning engines.
Switch the Smart Scan schedule to manual to prevent constant background scanning.
Enable hardware-assisted virtualization to improve performance.
Clean temporary Avast logs to reduce overhead.
If slowdowns persist, reinstall Avast using the removal tool to repair damaged components.
For expert-level tuning, contact Support @ 1-866-490-1-544.
These steps restore PC speed while keeping Avast protection active.