Performance issues with mark this pair as not a duplicate when accessed from search

When the merge screen is accessed from a search the 'mark this pair as not a duplicated' can cause serious site load. This is simply because the url to which the browser is directed to afterwards is not 'reasonable'.

The user is redirected to civicrm/contact/dedupefind" q="reset=1&action=update&rgid=$rgid. Since they haven't come from a dedupe search rgid (why rgid?) is empty so they are redirected to civicrm/contact/dedupefind" q="reset=1&action=update&rgid= - which attempts to resolve all dedupe rules from the looks of it.

I don't think the correct url path is clear in this case - is it one of the 2 contacts. So, my currently thought is simply to not redirect if the rgid is not present.