Why does the server get really laggy when more than one player is in the game?

[dreamy ledge]

The game runs really smooth when its just one person, but it gets laggy when another player joins, and Im planning on having 8 people per server.

Parts: 3k parts
Instances: 240k

My game is also a merging game where you merge fruits and whenever you click, a fruit spawns. Maybe the game lags because the script.Touched event fires a lot.

[dreamy ledge]

Update: I think its only the physics simulation thats lagging

[lone oxide]

if you have so many unanchored parts it will lag

[dreamy ledge]

i dont think i have that many unanchored parts