Don't know what kind of an issue it is but when I search for servers my game fps slows way down and it gets very clunky. My friend plays on a [censored]tier laptop than my computer and his looks for servers with a smooth screen. I can play the rest of the game in multiplayer, campaign, challenges, w/e and run perfectly smooth without issue. I can even record fraps on 1440x900 with max settings and its still smooth. Only problem is the server search screen for some reason. Here's my computer specs:

HP Pavilion
Windows 7 64 bit
6 GB RAM
Nvidia GeForce GTS 450

Me and everyone who I've asked has said the server browser is choppy, not sure if there is a fix at the moment.

ANOTHER ISSUE THAT PREVENTS ME FROM PLAYING THE GAME! You can't even browse the server menu properly! Fix this and the very very very very very bad performance with the ATI cards.

I find it strange how my room mates crappier laptop finds servers with a smooth screen, i'm like dumbfounded about what could be the problem.

I find it odd that the game was delayed not for the purpose of getting rid of these bugs.

I have the same issue, though I also get a transparent blue screen while in-game and the textures are all gridded. Mine is just riddled with problems. ) :

Game runs smoothly for me except for when I search for servers. Huge pain in the ass but certainly no game-breaker. I hope they fix it for me.

Browsing servers results in sever stutter/lag. Rest of the game runs perfectly.