Hehe, this thread isn't new to these forums.
(But to be honest, I can't find the first thread about it with a quick search either.)
Yes, the loading times on the customisation are quite long. But then again the items look very detailed, too. No plain items like in All Points Bulletin.
I guess on PCs with good RAM they won't take nearly as long (and remember: RAM is a very big problem on consoles). But on consoles you probably have to install the game to your HDD to decrease the loading times slightly.