brotherhood_of_LAN - 11:34 pm on Aug 11, 2013 (gmt 0)
Server must render the response (< 200 ms)
Clearly you would want to avoid any external calls to other servers... like social buttons.
The thing to bear in mind when Google offers advice, is it seems to be 50% about what users want, and 50% about how it can save them resources spidering your site.
Saying that, the web as a whole would likely be served quicker following some of their practical advice.