[wp-hackers] Plugin conflicts with latest version of Jetpack

[Jeff Morris]

Mike: no disrespect, but there's a whiff of BS about that G claim. 
First-page load equates to every time you F5/refresh. Nobody can get 
around that, so what is G on about?.
If you want to discuss the tarpit issue with WordPress plugins, lets 
talk about the fact that so many of them load everything including the 
kitchen sink into the server process despite most of it being 
irrelevant/redundant.

This guy has his eye on the ball:

http://www.dev4press.com/2012/blog/benchmark/plugins-performance-testing-2012-january/

And if WordPress itself can send HTTP headers, it stands to reason that 
so can any coder.