I used to have one of these and recently got an M1 Max machine - the performance boost is seriously incredible.
The throttling on those late-game intel macs is hardcore - at one point I downloaded Hot[1], which is a menu bar app that shows you when you're being throttled. It was literally all the time that the system was slowing itself down due to heat. I eventually just uninstalled it because it was a constant source of frustration to know I was only ever getting 50% performance out of my expensive dev laptop.
