That's why I downsample a copy of the final 16x12 tif file to jpeg for upload. Only thing I have found is that windows viewer in XP doesn't always like LZW compressed tif files. Makes errors in it's display of them. I use ThumbsPlus to do my image library functions so it's not much of an issue for me though.

Pass no temptation lightly by, for one never knows when it may pass again!