I haven’t played simultrans, but I wonder if it feels less janky on a 120 Hz or 240 Hz monitor, since both of those values are evenly divisible by 40. Compared to playing on a 60 Hz display or other non-multiple of 40 refresh rate monitors.
Ever heard of little games called Diablo 1 and 2? People spent billions of hours playing those on displays with framerates faster than 25 for 2 decades.