It seems like images are reloaded everytime I switch pages in the forum. I am on a slow line right now and the Nim logo top-left is "flowing" in every page load.
I would suggest to implement some expiration headers or at least supporting "if-modified" or "etags" it that is missing. I may even help with that if it is really missing.
If that is running though a reverse proxy one might configure it such that the static stuff is not served by the forum software itself.
P.S.: I did _not check the forum or whats really going on as I miss the tools for this right now.
OK. I would go with simple "if-modified-since" and "expires" at first (for static content mostly).
That should be pretty straight forward. I am interested in Jester but did not look into it so far. I may contribute something after I got my normal work "in shape" for the week. Nim is just to tempting. Good that I can mostly decide alone what technologies we use in the future ... hehe.