>with SET ANSI ON ? ( i have not VFP9 )

No, SET ANSI was OFF in VFP8 and VFP9.

With SET ANSI ON VFP8 is a little bit faster - 0.007 and VFP9 is much faster - 0.008 because query became optimazible:

Rushmore optimization level for intermediate result: none
Rushmore optimization level for intermediate result: none
Rushmore optimization level for intermediate result: none
Joining intermediate result and intermediate result using temp index