iDisk slows down file dialogues


I'm using a G4 cube, 768 MB Ram, OS X 10.4.2 and a .Mac trial membership.
iDisk is one of the features that I like about .Mac but performance seems to be very lousy.
I have automatic sync turned on and set its option to manual. I thought having a local copy of my iDisk would make things faster, but somehow it makes all "Save as" dialogues very very slow, last night I even fell asleep waiting for the dialogue to save an HTML file.
Has anyone experienced similar problems and maybe a fix for it?

Thanks a lot in advance