I read an article last year on "Speeding up Stack Exchange" that talked in depth about the 'multi-tenancy' nature of the (then) Stack Exchange 1.0 sites. I tried finding that link again today, and instead found the Twitter Trackbacks for it. The article itself brings up a 404, and it leads me to believe that the posts from blog.stackexchange.com weren't ported over, or if they were, there aren't any redirects issued for them.
You can view the old blog at http://stackexchange.tumblr.com/. I think the actual post you want is here: http://stackexchange.tumblr.com/post/459188139/speeding-up-stackexchange
We only migrated over the last few posts to blog.stackexchange.com, since they were the only ones actually still relevant in the new Stack Exchange.