I know most if not all of you may already know this, but ATI just released a preview of their catalyst 10.4a drivers. Since it's a preview it's not the full release but I haven't seen any issues with it so far.
Linky: http://support.amd.com/us/kbarticles/Pa ... otfix.aspx
This reduced my loading time on my Radeon 4890 from 36 seconds to 8 seconds when testing on my server. I highly suggest you give them a shot if you own a ATI Graphics card.
As per the link the fix in particular:
-ZLong load times for new maps in Battlefield: Bad Company 2 when using a Windows 7 / Windows Vista based system with an:
ATI Radeon HD 5xxx series graphics card
ATI Radeon HD 4xxx series graphics card
ATI Radeon HD 3xxx series graphics card
ATI Radeon HD 2xxx series graphics card