my Graphics Settings are

So, My problem with low fps is when I'm Playing in a server that has like 30 players, but it depends the track I'm playing on. I was playing at Hostile Hills one night with like 25-30 players and it was good, My fps were high, I had not lag problems but tonight when I was playing at FamMx Racetech Stadium with like 30 guys My fps were low. I have the medium resolution FamMX tracks. When Im Playing with like 10 guys at those sx tracks my fps are good but when I play with 15 guys or more my fps are getting lower and lower. So what can I do to get more fps at those sx tracks when I'm playing a 30 men race? I just want to play with a good graphics settings, I had played on High Fps settings since I donwload the game because I used to play on a laptop that was not good. But now i have my desktop and I know my processor is not the best. I think i have low fps at FAMMX tracks because they have a lot of shit around the track, no? xD
Well, I just would love to play with the best graphics settings my Pc can do but only if it doesn't affect when Im playing with 25 guys or more. so please help me because I don't have any idea of how put my graphics settings. But remember I have low fps only in those FAMMX tracks when there are 15 guys or more. Thank you


