Just got this from the official site, but any part with 8+ fairies onscreen at once lags horribly - the final spell of the game with the ring of fairies was getting about 20 fps throughout. It's moderately better in window than fullscreen, and 16bit than 32bit, but it can't hold 60 fps regardless. Turning off DirectDraw in the config does solve it, but then it looks like total garbage.
Computer is above all requirements shown on the site, and I'm in Japanese locale (real, not AppLocale). I tried setting compatibility to XP SP 3 too, but that didn't change anything.