The settings are around middle of the road with a few turned up (textures, game objects, and effects I think). I've tried tweaking them and restarting but it didn't seem to change anything on these maps. I'm assuming it's probably a combination of the map introducing more objects, particles, and effects throughout the match but was curious to see if anyone else noticed this.
Some specs:
Radeon 7850 2gb (no overclock)
6gb DDR3 system RAM
4x i7 @ 2.8ghz
I'm going to try playing with overclocking a little to see if that improves just my overall experience (SP and MP).