Actually, I misread your earlier post. Yes, what Facebook does is progressive rendering, but I disagree that it's the ideal since it's still blocked by JS. The

Actually, I misread your earlier post. Yes, what Facebook does is progressive rendering, but I disagree that it's the ideal since it's still blocked by JS. The ideal is serving HTML from the server which can get content on the screen before JS downloads. "That is just built-in browser technology to achieve the same goal" - exactly. Tweetdeck does progressive rendering, but it avoids the simplest way of doing it and instead reinvents the technique with JavaScript. You can see what this does to performance.