Chosen Solution
My Mini (Late 2012 - 2.3 I7/Dual 1TB server version) is constantly hot. I have had graphics issues when it gets hot but it will also get very slow. Any suggestions on what could be the issue?
I think you’ll need to do a bit more diagnosing here. How about running this app: TG Pro it will allow you to see what the built-in thermal sensors temps are as well as tell you if the systems fan cooling effectively or not. Take a full screenshot of the main display so we can see what it shows. Paste it into a fresh answer.