Do M1 Macs slow down over time, and if so, is there a fix?

Please do not provide a link to that garbage for further examination. 🙂

Over the years I have found that not all, but 90% of problems are due to Users installing third-party AV, Cleaning, Optimizing and other types of Crap-ware on their Mac's. Or... they think that a Mac can have a million and half App's open and running at the same time.

For a good tool to measure your Mac's performance now and down the road.

Download and run EtreCheck Pro from the developer, at > https://etrecheck.com/en/index.html

Then save and/or post your report, as per > How to use the Add Text Feature When Post… - Apple Community

While I do not have an M1 MacMini, I do have an M1 MacBook Air that has the same M1 that is in the Mini and 512GB SSD that I bought a few weeks after the M1 Macs came out in November 2020 and it is just as fast now as it was then.

Actually in some cases it is actually faster as many of the apps that were originally Intel now have native M1 versions.

You're welcome. Glad to hear that the M1 scored well on your initial project. It should serve you well for many many years, if you don't try and turn it into an MS PC.

Just for future reference, this isn't the place to repeat, verify or discuss rumors.