we've had some issues on Exchange 2007 where the disk is being thrashed by SCR on the secondary server as a result of windows search being misconfigured on desktops. SCR queue over 1000 objects seems to be the smoking gun...
get-storagegroupcopystatus -server server1.domain standbymachine server2.domain |where-object {_.ReplayQueueLength -gt 1000}
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