FM12 Relational Search Too slow

[James Gill]

I have an extremely simply relationship in Filemaker 12

Authorization -> AuthorizationLineItems

The authorization table has about 20k records and the AuthorizationLineItem table has about 90k records. When performing a search on an indexed calculation field directly on the AuthorizationLineItem table this search takes less than a second. However, when searching that field same indexed field through the above relationship from the Authorization table, the search takes in excess of 5 seconds to complete.

Is there some fundamental issue with the above relationship that I'm not aware of, or is Filemaker 12 WAY slower when it comes to related searches when compared to Filemaker 11?