Malware hogging the memory

Hi, welcome to the Apple Users Community.

Please try this link for help with your issue

https://support.apple.com/guide/mac-help/protect-your-mac-from-malware-mh40596/mac

Malwarebytes is highly recommended

Best of luck

Please read the following user tip and restate your question/problem in detail: 

Writing an Effective Apple Support Communities Question - Apple Community  

What "malware" would that be?