I confess, I’m a speed freak, premature optimization type 
Still not that good with Google’s PageSpeed, i’ll fix those warnings soon (most of them, however, is from external hosts)
The essential plugins are:
- WP-Super-Cache: this one is trivial. Every WordPress blog should have this plugin enabled by default.
- Use Google Libraries: replace WordPress included javascript libraries with copies hosted on Google’s servers.
- WP-Minify: minify your files (HTML, CSS) then concatenate CSS files into one file. Javascript files served by Use Google Libraries are external and minified already.
combining with some tweaks in my WordPress theme and nginx.conf
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