Grass rework - all 7,500+ grass clumps in the world are now drawn from one batched system instead of being thousands of separate objects. The level carries around 80% fewer live objects, which should mean smoother frame rates, especially on lower end machines.

Grass draw distance - grass far from you is no longer rendered at all and streams in as you get close, so the game is not drawing fields you cannot see.

Grass still squashes - every clump still folds flat when you walk or drive over it and springs back up afterwards, same as before. It just costs a fraction of what it did.

Faster loading - the level file is much smaller without all that grass in it, so getting into the game should be quicker.