Compared to other forum software this site feels slower to me when switching from one page to another. I dont mean the different content (which has to load from a database I assume) but more the constant parts like graphics, header/footer and sidebar.
Could it be, that you dont allow client side caching? I have yet to take more closed look to our SQUID server but it seems to me that I always load the whole page directly from you instead of using locally cached copies for the non-changed parts
it seems that now also compression is no longer available so the pages are not compressed during transfer.