RA:APB launches a brand new version. Included in this update are many changes across the board, from changes to various weapons, to physics changes to some vehicles, tech level changes, new graphical effects and loads of performance tweaks. Too much to list here, really. You can check the whole list yourself here or at the previous news posting here on ModDB.
This version was primarily meant to be a balancing patch but increasing performance also became a focus. We've seen double-or-better performance pretty much across the board.