I had a software update which cured a super slow iPod browsing issue.
If you're out of warranty, the dealer might try and sting you for it if it's not a proven issue.
A fairly common known problem is the iDrive crashing or freezing, which can't be replicated ad-hoc but might help in getting the update if it's reported as an issue
Having said that, entering an address via the nav is pretty slow, as it's getting info from the DVD
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