usually in the 50s? my max fps has been 13, really. but the laptop is a bit older, one i used to have in the garage. i can't complain about the graphics, Zwift looked awful when i was using it on the same machine too so i am not bothered.
IndiVelo is not bad really, especially considering it is free (for now). there are a few places where the grade changes are...unusual. like one moment i am at 2%, then it changes to 5, then 8 then 12 all in just a few peddle strokes. i have never encountered that in real life except for one place.
i no longer use IndieVelo since i've restarted my Rouvy subscription. I have no issues with Rouvy aside from all the button clicking and the whack-a-mole like interface they have.