>Does it perform the same if you use enginebehavior 80?

Yes, it is not a factor.

>When you say "optimized" I guess you are basing this on the response obtained and not on VFP's SYS(3054) return.

Yes, visually, as when I can see that is returns the result in 0.00 second as oppose to showing a progress bar, then, we can really see it is fast.