I have a very weird problem with Niddertalbahn where framerate drops to 4fps from steady 30fps after reaching 9kmph, and its back to normal once i hit 8.9kmph for some weird reason. This happens after Höchst(Nidder) towards Stockheim. Can't confirm how long that happens as it's literally unplayable after Höchst(Nidder). it works fine before Höchst(Nidder).
