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A friend of my self has a problem in heo4 like the game only runns on 1 fps since the 10 of march this year and reanstealt the game more then one´s and it still kannt be fixed ....
Sounds like your friend needs to post in the tech support forum.
 
that could be so many things. my first guess would be CPU overheating, since hoi4 is very heavy on CPU. tell him to install a temperature monitor and take a look if it's getting too hot
 
Does he have a laptop or at least a CPU with built in graphics? The game might run on the crappy GPU. Force the game to run on dedicated GPU.