⟩ If you only had an hour (in one shot) to spend on WSO [web site optimization] for a given site each year, what would you do for that hour, and why?
I'd pick the low-hanging fruit. Eliminate excess (graphics, multimedia), cut your prose in half, and optimize the rest. (you could install mod_gzip etc. in less than an hour also). The main thing is to make sure that your home page loads quickly.