

You may be familiar with SharedUpgrades or SyncHostUpgrades
This mod is a combination of both, and it is not buggy, not laggy, not inefficient, and not partially implemented.
The code behind this mod only runs when a player consumes an upgrade, a player joins the game, or a level is loaded.
This is different behavior than the other mods, which run every frame to check for upgrades.
It was programmed and designed properly.