My PC has become unusable when MBAM Premium 4.0 protection is activated (Windows 10 Pro - version 1909)
I have no other antivirus than Windows Defender.
Applications take several minutes to open.
Whatever the browser (Firefox is my default browser), pages are very long to open, Firefox freezes most of the time.
The task manager often indicates a 100% processor with a maximum on "System interruptions".
Malwarebytes blocks on an update or scan, I am forced to interrupt