More portage questions

I added the metadata/some-cat to the rsync_exclude list by prefacing every 
entry with an '*'. Vastly increased the 2nd phase of sync'ing and cleared up 
some storage. I gather that the the cached files end up in 
"/var/cache/edb/dep/usr/portage/". Would purging the rsync_exclude entries here 
cause any problems?  I'm guessing that `emerge -S` searches would be faster as 
there are less entries to check. There's also the storage issue as well. Thanks
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