Have you tried increasing the rate of the particle emitters instead of making multiple of them?
Also, a cheap thing you can do is add a part that constantly floats above the player’s camera. Add the snow particles so that they fall from that part. You can even set it so if the camera is under a part, the snow stops.
The issue with particles is they would only be seen in a small area around each player. If another player joins they’d see their particle plus the ‘extra’ ones around other players.
Many people use a single local gui on each player’s screen with the image moving down. There are probably a few posts you could search about snow or rain effects. The good thing about this is it won’t lag the server at all.