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VBR suggested the following
(in a post for GT5)
"Do not listen to music in GT5 whilst racing! Having the BGM on not only makes your PS3 work harder (maybe contributing to lag), but it can actually cause you to get disconnected from online rooms, it's a known bug with User BGM. Turn all music down to 0 in the Options menu, including menu music, before attending."
This makes sense to me. Asking a busy system to do
less "stuff" can't hurt. My online and offline experiences are great in GT6 which may in part be due to the fact that I have never turned any music on. I don't see frame rate issues and tearing. This may be because I'm not sensitive to such issues and am not looking for them, in which case, ignorance is bliss.