Getting Lag, D/c after 4.01

[taka2010]

Here is my computer spec:

Asus M3A78-EM
AMD PhenomII 940 3G
MSI R4850 512MB (No PowerPlay)
Kingston 2Gx2
Windows XP Pro
Western 7200RPM 100G

I didn't have any problem to raid 25 player raids with " FULL EFFECT" but After 4.01, I'm always getting wow lag, why why why ?
Here is the SS of my Video setting:
img253.imageshack.us/i/10334130.jpg
img824.imageshack.us/i/75191496.jpg

Does Blizzard change the video card req after 4.01? should I get a better video card now or should I wait for cata? I'm looking computer set up that I can play with full effects in 25 players raids w/o lag
thanks a lot guys
PS: Sorry about my English if I did any mistake.

[TarzoEzio]

Well....i have no idea, but this should be a bug..i think, or it just meh just not working..still have no idea..

[Hyde]

Same problem. I do think it has something to do with my modem though.

[kleynach]

Try update ur Graphic card drivers. worked for me.

[taka2010]

My video card drivers is the newest already. does blizzard change the video card req after 4.01 ? or it's just a bug?

[taka2010]

Still getting lag by doing 25 raids ! FPS is still under 10 w/ basic effect and only recount/omen + tukuki UI.
Help !