The game has been updated to 0.2.1 which brings some long due optimisations to terrain and draw distance, before the update the game was really struggling on some lower end machines because of the draw length of grass & trees.
The best example was Snowfall, lots of trees and detail – well this has been adjusted on pretty much every level to improve frame-rate, if you’re still getting bad frame-rate or drops try dropping the launcher quality down on start-up as well as tweaking the resolution.
As always you can find these update details in your game directory and they’re also included below for your convenience!
0.2.1 http://grasssimulator.com/update/8432/changelog.txt
-removed old InControl plugin that was not setup
-changed terrain draw settings for grass and trees on snowfall & bad disco
-deleted a bunch of unused objects on range
-fixed player spawn placement on range (-Y)
-fixed player spawn placement on snowfall (-X -Y)
-removed unused cameras on bad disco
-turned on some small fog on bad disco to compensate for the terrain changes
-players where getting stuck sometimes on the range roof, so the roof is now hollow
-box collider disabled on range roof
-fixed some errors in the console that where constant
-cleaned up a few shaders and put the revolver back to normal map