But a request to twitter blocking everything else would be an issue, right? Aside: haproxy, configured cleverly, can deal with limiting the number of concurren

But a request to twitter blocking everything else would be an issue, right? Aside: haproxy, configured cleverly, can deal with limiting the number of concurrent connections permitted to your app on a URL basis (or just about any other part of the request you can deconstruct) to allow your app to not get hung up on slow queries and keep fast queries going where you want them.