If you want a bit more of an explanation, gentoo takes ages to install itself and the prerequisites for a lot of other stuff, however, after that, it can easily be one of the fastest linux distros out there due to how nearly everything is compiled for YOUR system.
Oh, so now it makes sense why it is a stufflord of a operating system.
I didn't want to try to derail this topic, so I think everyone should continue on to the main problem here.
@OP, did you try to check if the fan was fine?