Sims 3 keep crashing either because of snow or i don't know?

QuasarMay​  You need to confirm in-game that the fps limit is being respected.  It should be with this Nvidia setting, but don't assume that.  The cheat fps on will put a counter in the upper-right corner.

Please test with NO snow on the ground as well.  Bring up the cheats console (ctrl-shift-C) and enter testingcheatsenabled true , then shift-click the ground and select Seasons to see various options to change the season and weather.  Set the snow depth to zero in addition to forcing a sunny day.