i have performed some upgrades to my computer as well (50 times faster internet, doubled the ram, new graphics card ect ect) and to think of it, it has kinda started since i have done that, i doubt it could be the answer but it is a possibility. i know about some techniques's of "deliberatly lagging" the game

as blanka or nosoul said ill tell one way i use it, attack your opponet into a corner and kick hardout continuously keeping them in the corner so they cant move, but whats is really happening is usually your partner has got away on there screen but not on yours because your are creating the lag with the continuos kicking, your opeenet usually sees you kicking away at nothing in the corner and uses there special move on you, knowing this and judging how long you have been there kicking furiously (leveling up hardcore i must add

) super jump all the way to the other side of the screen, when the opponet charachter (on your screen) resync's when your opponet (in there screen) does a special he will appear just infront of where you super jumped to (usually giving a chance to unleash all hell on them with your newly accuired levels) but now just causing you to freeze up and not being able to move at all.
every stratigy i have is now useless with this blocking/freezing crap ???
maybe its time to blow the dust off the ps2 and x-box when i wan to play a game ???