Internet slow after avast browser cleanup

Hi guys.
It happens every time! I click on browser clean up and the everything goes to hell! My browser is slow and the pages gets stuck. VERY annoying. I’ve been using avast since forever.
Avast kept saying virus detected. Malware, but when I ask for details, it tells me my computer is secured and to upgrade. But when I open my browser it says threat detected. opening the avast page on my desktop, says system secured…until next time…Help. I cleaned up my browser and now I’m frustrated.
Thanks guys

Please post in the correct forum next time.
https://forum.avast.com/index.php?topic=53253.0