A glimpse at the immense improvements on OpenSim 0.6.3: scripts can now be edited in-place (inside objects), region crossing is almost as flawless as on Second Life, several levels of cacheing will rezz almost everything in seconds, just like on SL, attachments don't get lost. The experiment was done using a cleared cache on Imprudence. You can hardly see a difference from the loading time on OpenSim — except for my hair attachment :) which took several minutes to rezz :)