There seems to be a lot of reflective textures on this map and weird lighting effects, could this be what is causing this FPS drop?
You have a screenshot? There are no reflective textures or odd lighting so it sounds to me like hardware artifacting. Usually happens when your gpu is about to die, overheating or has been overclocked too high. What is your gpu temp when playing?
Humm I think I didn't express myself correctly. I just created a local server to test it out and it's not the map itself that has reflective textures, it's the mechs and vehicles. There is so much reflection due to the intense light on this map that the mechs get all shiny... I was wondering if that could be causing an issue with FPS...
Funny thing too, locally my FPS was never below 50 most of the time (I hit 35 a few times when turning fast towards something with a lot of lighting).
So bottom line, I think the issue is (assumption here, and a guess) that when there are too many players and vehicles near each other, that my client is having a hard time to process all the reflection created by light shininy on them.
the fact that everybody running on low has no problems at all may be an indication that this could be a potential issue... if my logic makes sense...