Graeme, >> Without the perceptual table creation, a "high" quality >> profile is quite quick to create. (feels like a few minutes, haven't >> timed it) Adding the perceptual tables added between 1 and 2 *hours*, >> I think, including perceptual saturation tables. FWIW, patches = 3000, >> and platform >> is a 1GHz Pentium V, 1GB memory, and is running Windows XP. > Hmm. That's more than I would have imagined. I haven't noticed such a > dramatic slowdown with the change you mention. Perhaps if you sent > me the .ti3 and the options you used, I can take a look at it. I was mistaken. Without the perceptual tables, a high quality profile creation takes about 17 minutes. I haven't re-timed the operation when perceptual tables are included yet. Thanks for all the other info. Greg.