I just noticed this thread. I posted the following in the main test patch thread yesterday, but it seems like this is a better place for it.
People have mentioned the FPS issue caused by new, larger grids. At the moment there is a "Multiplayer Car Draw" setting, the purpose of which is self explanatory.
I think another option to limit the number of cars which can be drawn at the same time would be much more useful. If I only had 10 cars drawn at the same time, then I wouldn't get the game slowing down massively on the grid. However, I would no longer need a low draw distance and, on a long straight with a few cars spread out infront of me, I would be able to see those cars and not experience fps drops.
At the moment, if your PC can only cope with 10 cars on screen at once, you have to set a very low draw distance to avoid unplayable frame rates at the start. However, it can be quite frustrating to have cars flickering in and out of the draw distance when you only have one or two in sight, and it simply isn't necessary.
Sorry to bring up a suggestion in this thread, however, I think it would be a great help to a lot of people.