Welcome Nikita. If you increase your RAM, P5 will run better. But, in my experience, it will always run worse than P4/ProPack. P4 is much smoother, faster, easier and more fun to use. Also easier to learn. IMO, the P5 renderer is not noticeably better than the P4 renderer unless you use the advanced materials of P5, which are pretty hard to get a grip on even for an experienced Poser user. Plus, those features slow the renderer to a crawl...if it works at all. Trust me, it's a huge drag to sit around waiting to see what every single change you make will look like. There is no "area render" in either version...you have to render the whole scene. A lot of people say their P5 problems were fixed with the latest Service Release (SR4). That's not been my experience. I've found one bug fixed in that release but loading and render times have increased for me. I still stick to what I've advised others before: even if everything worked fine in P5, there's no way a beginner needs (or will even use) the add-ons it comes with. Without those add-ons, P5 is P4 with ProPack. Go with P4 and by the time you get proficient with it, Poser Six may be out. By CL's own words, P6 will focus on stability and workflow. I don't think they'd have said that unless they knew P5 has stability and workflow problems. But, if you have your heart set on P5, go with it (just make sure you up your RAM). It will be slow and clunky compared to P4 but since you've never used P4, you won't know what smoothness, speed and fun you're missing.