I have both U30 and W17 installed on the same HDD of the same computer. I've spent time to be sure both versions are using the same settings (also applied Scawen's LOD magical math formula).
Now in single player mode, AS National, on the starting grid W17 had about 10 FPS less than U30 but has about 15-20 FPS more on the back straight. Vsync is OFF in both LFS and the video drivers, no FPS limit applied in LFS.
So is it about LOD or hi res mirrors ? In all cases disabling all mirrors gives in a huge FPS boost, of course.
Maybe, for testing purposes, put back on the option to disable hi res mirrors ?
Many players have complained about that since patch V. For a while we thought that the anti cheat tyres barrier we have added was the culprit one but removing it didn't help.
http://www.lfsforum.net/showthread.php?t=16019
I still believe that, with the current netcode, priority should be given to race events and not to players connecting or leaving.
Especially when the countdown for a new race has started it should never be stopped by a player connecting to the server, it sometimes takes ages to get enough votes to start a new race on populated servers.