queri - I VERY much doubt that the size of Runtime is of any relevance at all. Mine is about 90 000 (Yes, 90 thousand) files and 25 Gig or so and it has no significance for Poser5 (didn't for P4 either) except for one thing: When I click on the libraries, it takes a second sometimes before the popup window pops up. Not always, just sometimes. P4 2,53 GHz, 1 Gig RAM, Win2KPro :] Fish