Your machine will have a resistance type foot controller. All resistance type foot controllers will get warm, some get hot. The slower you go, the hotter they will get as the electrical current is dissipated as heat.
You can install a modern resistance or electronic foot controller and that will take care of the problem.
If you sew slow a lot then an electronic controller such as Sew-Classic sells will do the trick.
I have one that I use and it works quite well. The only thing I don't like about it is it's made out of lightweight plastic and there's no substance to it. It has a tendency to scoot all over the place.
Joe