How much do your games slow down as your career goes on?

I've played some long careers but never really noticed any in play slow down.. There is some slow down when saving and loading, but other than that it's pretty much remains at the same pace it was first season

also, just realised I referred to a video games processing speed as it's 'pace'

I've definitely been playing this game too much

It's dependent on the muscle of your pc, and how many leagues you load/what detail you run. My dad has suffered crippling speed issues on his PC in a career game with too many leagues and a sub-standard rig. Becomes more prone to crashes and game-breaking bugs too.