I posted this on RallyeSim but I think it'd be worth posting here too Recently I built a new PC, and when I installed RBR and all the RSRBR jazz, my game lags. Every 2 seconds the game will lag for a split second, and it becomes very annoying! What's even more annoying is that I shouldn't be having any problems at all running a game like RBR with my rig. I've tried setting the affinity to just one core, messing with the graphics options, but nothing works. I've been at this for a couple weeks now so I'm hoping one of you here could help me out... I also just reinstalled RBR and tried it vanilla and it still lags. I've noticed that scenery density seems to be an issue. On the Newbobs stage, the first section there aren't many trees around so my game runs fairly smooth (though there's still noticeable lag), then when I hit the forested section the lag really kicks in. Here's my rig (pasted from the RSRBR tool) Processeur : Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz - Nb de core : 8 RAM : 8GB Carte graphique : NVIDIA GeForce GTX 580 Windows 7 64bit As you can see there's no reason why I'm getting any lag at all in this game, I run everything else I have at max settings no problem at all, I'm really perplexed about this. RBR is one of my favorite games and I can't enjoy it on my new PC!