Saw your comment in a closed topic so can’t respond there.
Snow in TS3 caused terrible lag on my (quite powerful) PC and it had an ugly graphical glitch - holes at the edges of the streets where you could look through the ground. I really hope TS4 brings some improvement.
I’ll leave the lag because that issue clearly is so experience based that nothing sensible can be said about it (it hasn’t caused lag on the two computers I played Seasons on, are you sure it was the snow?), but the glitch you’re describing I’ve only witnessed in Bridgeport. Did you see it in other worlds? Because I haven’t. Snow in Aurora Skies has a glitch as well (a different one).