>The batch process modify the structure of every table on a database. The primary keys (c 6) is being converted to I (autonum), dropping some fields, adding others, etc. Is very simple.
>All tests has the same result with 1 or 2 secods. the diference between vfp7 and vfp9 is the same.

It is possible that 9 does a bit more checking on the table integrity than 7 did. As a rule, any new version was more strict about detecting what may be wrong with a table. More checking, more processor time.