Performance issue for "Show Unused Test Objects"

@ThanhTo here are the results from yesterday.
Also note that the Cancel button is read-only while the search is working so users
cannot break out of the search if needed.
Thanks Dave

Project #1:
33 Keywords
3066 Objects
353 test cases
“Finding Unused Test Objects” took 2 hours to find 2125 unused objects

Project #2:
23 Keywords
1053 Objects
85 test cases
“Finding Unused Test Objects” took 30 mins to find 7 unused objects