FastCraft is a sophisticated mod which improves the client and server performance significantly without any game play changes. FastCraft is useful for anything, even fast PCs and servers benefit.

The mod is optional on both server and client, meaning that it can be installed on both server and client, just the client or just the server. Even mismatched versions between server and client are fine. It is recommended to always use the latest version on both sides however.

FastCraft doesn't require any configuration since it is supposed to be fully transparent to the user. To install FastCraft just drop it into your mods folder with Minecraft Forge installed.

Optimizations/tweaks FastCraft applies are very broad and include the following:

FPS improvements (client), benefits depend heavily on PC, mods and the world
TPS / simulation improvements through faster code and better algorithms
Lag spike elimination from world generation, light calculations and chunk loads
RAM savings of around 200 MB for a decent amount of mods
Faster chunk loading (client/server) and rendering (client)
Faster game startup
Minor network bandwidth reduction in some scenarios

Note that even if you may not notice any immediate effect, FastCraft does a lot against lag spikes that may only happen sporadically or with specific setups/builds.

Due to bugs there can be rare instances where FastCraft actually slows the game down, in this case please contact me so I can eliminate these issues. I also release preview builds of FastCraft frequently, try them if you experience issues or want to help development.