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0e1f616
(Get the code!)
I ran across this bug because bug #528925 makes this very evident. It seems to me this bug is actually in synaptic as that is another of the big CPU consumers in top and I can reproduce the same behavior by running "Reload" in synaptic. I'm guessing update-manager is actually calling synaptic to do the work.
I tried strace on synaptic and it seems to be doing poll() in a tight loop and getting EAGAIN repeatedly. It should probably be doing select() instead or at least sleeping for a little bit between invocations. No need to update the status bar as fast as possible, it only slows down actual work, like installing packages. :)
I grepped the synaptic source and couldn't find any calls to poll() so I guess it is being called inside a library. My gdb skills aren't enough to track that down.