I have the 14" M1 Max 10/32 core/64GB. I am using it for video editing using Adobe Premiere, Photoshop and After Effects.
For just light use - web browsing, reading mail - it is actually cold if I put it on my lap.
For all the heavy stuff it will get warm, which is actually nice and comfortable if it is on my lap! Performance Core temps will get up to 147 degree F and the fans will kick in running at about 2400-2700 but I can't hear them running. When just browsing the web core temps sits at 109 degrees F.
I don't know what the others, who claim it is getting hot, are talking about. I had a 2020 13" i7 and it got HOT! I could not hold it on my lap when I was pushing it. As for memory leaks - I have not had a single problem with that and I tried to overload it. It runs smooth and fast.