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100% of the CPU used. Damage?

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Hello and Welcome!

The scheduled threat scans happen pretty quickly so I would say no... If you have the Premium version with all active protections turned on, I would only schedule a weekly Threat scan.  Full scans would take a lot more time (could be hours depending on how much data you have) which would put undue stress on your system IMO.

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12 minutes ago, mbmo said:

I'm referring to manual full system scans which on my computer take around a half hour (or less). I have the free version of Malwarebytes.

There really is no need to perform a FULL or CUSTOM SCAN with Malwarebytes Anti-Malware. Why?

Malwarebytes is designed to remove malware effectively with a THREAT SCAN (formerly QUICK SCAN) which checks memory, looks at the most prevalent places and known launch points for active malware infections. The THREAT SCAN also detects any running malicious files regardless of its location so even if the malware is running from a location not checked by the file system portion of the scan, the THREAT SCAN would still detect it. This check includes not only running processes, but also loaded modules such as .DLLs injected into other processes. Both scans use heuristics that bypasses polymorphic blackhat packers & encryption, MD5, check memory (loaded .exes and .dlls), unique strings, autostart load points and hotspots (everywhere current malware is known to load from) and multiple other malware checks which are not discussed in public to safeguard the program from malware writers who would use that information for nefarious purposes.

A Full Scan is generally only recommended for heavily infected systems...showing obvious indications (signs of infection and malware symptoms) that something is wrong.

You can reduce the CPU priority see the below screenshot. (scans will take longer) your choice.



scan speed.png

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