Problem: tall signatures (y'know, the stylish little art bits & photos attached to the bottom of some posters' messages) are making the message board become v-e-r-y l-o-n-g. So, following a thread often takes several pages, 1/2 of which is scrolling through tall signatures. Also, biggers signatures take longer to load, so pages come up slower.
Solution: please try to limit the vertical height (# of pixels) as much as possible: ideally less than 60, but in no case over 100. They can be as horizontally w-i-d-e as 600 pixels, but just watch out for that vertical height.