This is only for people who still like using P4 Pro-Pack and ALSO have the latest P-5 updates. I have only tried this on XP and Win2K, and don't know how this affects Poser "Artist" (or original Poser 4) and how this might work on a MAC, since I don't own one. While migrating my huge Poser collection to faster SATA drives on a newer XP machine (Athlon 64) from my Win2K (P-III) machine using ATA drives, I discovered a few quick ways to greatly SPEED-UP my beloved Poser Pro-Pack. The upgrade consists of basically copying three P5 "dll's" over into Pro-Pack- asi32_13.dll imageIOEngineWin.dll imageIOUtilities.dll You should see about a 50% speed-up in Pro-Pack loading time and probably about the same in Rendering speed. This Speed-Up is of course HUGELY noticable on an Athlon 64 where my primary problem however was that the older Poser Pro-Pack dll's seemed to have a problem with my SATA drive. Basically this was where PP would say something like "Not enough Disk Space to render" when I was trying to render a 2048x2048 image and had 200 Gigabytes of FREE SPACE! So- the dll upgrades fixed that and another problem PP was having with virtual memory (I have 1.5 Gig of fast RAM)... So especially if you are using a new XP machine with fast drives and RAM, these dll's seem to fix the problems and bring good-old Pro-Pack really up to speed. My PP loading time on my XP machine (with 32 Gigs of Libraries) is only a few seconds. Rendering a 2048x2048 with all boxes checked (shadows, etc.) is around 10-12 seconds!