Just fixes the 64 FPS limit on the Windows Source DS without running an external program. If you don't have this problem, then you don't need FPS Boost. Useful for server owners that are trying to take advantage of higher tickrates.
Downloads for the Orange box engine (CSS/DODS/TF2) can be found
here
Note: This is a Metamod: Source plugin and therefor needs to be added to your metaplugins.ini