@Sivan : Yes, that's i think lot more better to work on individual parts ot have lot more speed. Does the terrain neightbours adjust their height smoothly with the chunck you modify ? You should have chunckc with more resolution perhaps ? we see a lot the polygons, just y taste and perhaps your game won't need that ?
@Realspawn : Their was a simple racing game without physic contribution. (But i don't remember where it was). Good work, looks pro.