Slow and unpredictable Mac performance: Is there a virus?

There are times where my computer works very fast. Other times, it really struggles. My WiFi service shows to be very good.


[Re-Titled by Moderator]

Original Title: Is there a way to tell if I have a virus on my Mac? The functionality is really very temperamental.

MacBook Pro 15″, macOS 15.6

Posted on Sep 12, 2025 02:36 PM

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1 reply

Sep 12, 2025 06:25 PM in response to EdJr96

Consider downloading and running this little "discovery" utility, Etrecheck. It changes NOTHING. Etrecheck was developed by a senior contributor here, and uses mostly system calls and simple tests to collect often-needed information.


it contains little tests for speeds of devices, CPU utilization, memory usage, energy usage and a digest of recent problems, in one easy to use package. it does not even need to be Installed. Because less can be learned when your Mac is running great, best time to run is when your problems are actually occurring, if possible.


if you follow the directions faithfully, its report (pre-laundered of all personally-identifiable information) can be "Shared" to the System ClipBoard, then Pasted into an ‘Additional Text’ window in a reply on the forums.


Use Etrecheck Pro for free:

http://Etrecheck.com


The amount of data you get can be daunting. If you POST your report, some Readers here are willing to look over those reports, and can provide valuable insights.


Then start a reply on the forums, click the 'additional text' icon, and PASTE


Slow and unpredictable Mac performance: Is there a virus?

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