I have a weird behavior on FB 3.0.2 32b, confirmed on 3 machines
(Win2012 R2, Win 10 CU, Win 10 AU). When I execute `isql -x
database.fdb` the first run is fast. When I execute it then again the
run is slow, like 5-10x slower. Then again fast and slow, fast, slow,
fast, slow etc.