Mine is a 6 years old mid-end PC running Linux, I use Arch btw.
As for your problem, N64 emulation is notoriously finicky, or it could be your drivers, check if they need updates, if it gets too heated could be the fans, it might be that it just need some cleaning (laptops are very delicate, take it to a professional), or, could be shaders as they tend to be the most demanding.
Windows likes to use far too many resources by just existing, and modern internet browsers are very resource hungry as well, that could be causing trouble as well.