>>1) When you say "tables open" you mean they are visible in the Data Session list? If so, what happens when you first do a DO FORM, and then type CLOSE DATA ALL? Is the MODI FORM slow again?
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>Yes, you could have them open in the same vfp session and visible in the Data Session list, but even if they are open in a different foxpro session, even in a fpw session, run-time, or design, doesn't matter. If the files are open in foxpro on the same machine, the effect is the same.

But, what about when open vfp, issue a DO FORM on the problem form, then issue CLOSE DATA ALL, and then try a MODI FORM on it? In other words, I only want to know if caching is affecting anything or not.

This is important to my testing & diagnosis attempt.