@jarunmb oh interesting! I have Sonoma on my 2015 MBP, I was worried upgrading would slow it down too much, in fact I've been thinking of factory resetting to the earliest possible os version
@brennan The 2015 MBP was a great model! Does that model have the glowing logo? Definitely worth investing the factory reset (if you can) to the original version to get your performance back, and then look at any security tweaks. Good luck!