if your plan is 768kbps you should have no problem, i have 860kbps and all is well with the ps3.
check your speed here and post it. you could try calling your provider and see if they could help.
edit: sorry if your location is not listed you could try here too
oh yea and if its possible for you to connect through ethernet do so, I find it better than the wireless and you might notice a small difference.
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