Terri Theurer from Yahoo spoke about some of the technical things you can do to optimize your blog. Yahoo saw that almost 60% of their visitors are arriving with an empty cache. That is they are loading all elements of the page from the web server, not their local cache. There was a thought that with the increase of broadband use that the browsing experience would be faster, but it's sometimes the opposite. Designers are developing heavier pages, combine this with an empty cache and you have long load times.

The other thing to think about is mobile users, they need an extremely fast download.

(Disclosure: Yahoo is a client, I have done design and development work for them)