save for web very slow

Hi

am running PS CS2 on a very hi spec win XP machine

everything else in PS is running super fast - but when I "save for web" there is a fixed delay of about 5 seconds while the file location dialogue box comes up (even for small images).

I am saving to a network but I don't get the delay when I'm saving the psd - can anyone offer any advice?

Thanks in advance

Well, the answer is 'I am saving to a network'.

yes but why don't I get the same delay when saving the PSD?

Luck!