Hi jaydiva, I'm not sure on any limits, but I would keep things to a minimum. Bryce has to load all of the presets each time you start the program, so the more you have the slower Bryce can get. Also, these files can grow to 100s of MB for each preset. This really can cause your hard drive to become fragmented, which can also cause your computer to start running slower. My rule of thumb is if I am going to use the object for many pictures, then it stays in a preset, otherwise I create it in one of my temporary preset folders and when I am done, I export it. That way I can use it again if I want, but it is not slowing things down. Materials though, I tend to keep all of them in presets. So far I have 4 folders with 14 presets in each folder. These are the ones you really need to keep organized. I don't know how many times I have searched through the presets looking for a water material only to find it in the misc preset! Now I have four presets just for water - clear water, ocean water, foamy water, and weird water. Peggy

LVS - Where Learning is Fun!  
http://www.lvsonline.com/index.html