Why Grow a Garden 2 lags
Grow a Garden 2 servers hold a maximum of 8 players — far fewer than Brookhaven or Blox Fruits, where crowded servers are the main cause of lag. That rules out "too many other players" as the problem here.
What Grow a Garden 2 does have is a lot of persistent, individually-tracked objects. Every seed you plant stays on your farm, growing through visible stages, even while you are offline. Decorations, crops at different growth stages, and guild-related items all accumulate over time and have to load in whenever you join your own farm or visit someone else's. The more built-up a farm is, the more there is to render on arrival.
This is the same category of problem as furniture-heavy houses in Adopt Me — more placed items means more rendering cost, regardless of how many players are around.
Reduce farm-loading lag
Set Roblox graphics to Manual, Quality Level 2, shadows off. Press Esc in-game, go to Settings. This reduces the rendering cost of each individual plant and decoration without making the game hard to read.
Give a farm 2 to 3 seconds to finish loading before you start moving or interacting, especially on a heavily built-up farm or right after joining. Moving immediately can make partially-loaded objects feel like stutter when they are really just still arriving.
Power plan and background apps
Set your power plan to High Performance. Press Win+R, type powercfg.cpl, press Enter, select High Performance. Close your browser before playing — background tabs compete for the same memory the game uses to stream in farm data.
Disable Xbox Game Bar
Press Win+I, go to Gaming, turn off Xbox Game Bar. Then Gaming, Captures, turn off background recording.
What to expect
On integrated graphics: 25–40 FPS on a lightly built farm, dropping into the teens on a heavily decorated one or right after joining while objects stream in. On a budget dedicated GPU: 45–60 FPS in most situations, with the same loading dip on join.