Does anyone benchmark those packages? The nginx-extras contains ngx_lua module. While it is not as heavier as mod_php, it makes me think about the performance.
My use case: I'm doing a long polling feature. It now can hold 600 concurrent Drupal connections (tested with the live iPhone 5 event), but I want to push it further: don't bootstrap Drupal, keep those connection only in nginx with a Lua script. I have now two choices: 1/ switch the -light package to the -extras package, 2/ keep using the -light package, but proxy the long polling to another nginx instance with -extras package. (I still don't know how to install both in the same server, maybe I'll compile one, but it's not a problem).
Back to my question: do you have performance problem with the nginx-extras package? Especially when you use embedded Lua or embedded Perl.
Edit: I took a round and it seems that the embedded Lua is not really "embedded": it calls the external script on demand, so it won't hurt performance much, but I'm not sure, so my question.