the PAL speedup is noticeable... mostly auditorially.
Although I do have to say, TNT often plays Jurassic Park sped up... but while trying to keep intact the audio "pitch" so it kinda warbles at times...
THAT is noticeable... I don't know how much they speed up the film but the speed up is extremely noticeable. Especially when you're use to the pacing in the regular NTSC version...