Hi,
I think, this is not Oracle or Oracle driver problem, but somewhere in vfp,

private pnID
pnID=10

with Microsoft driver:
sqlexec(,"select * from blabla where id=?pnID")
or
sqlexec(,"select * from blabla where id="+transform(pnID))
give the same speed

but with Oracle is the speed with "=?pnID" option much slower (100x) ..