Lighttpd

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You probably want to configure lighttpd to serve static content instead of PHP.

If your machine is powerful enough, you might configure php-fpm to handle more connections in parallel instead of being limited to 8.

well the problem is not PHP; i host multiple domains but this one has only static content.
I'm starting to think that its the some chormium browser that is limiting to 8 the maximum parallel downloads ?

However when using "google hosting" services via HTTPS they have SPDY and chromium seems to download more files in parallel (almost all!).

I started to compare speed of my VPS with lighttpd against this google service... but maybe i'm comparing apples vs bananas.

I wanna also make clear that i've no PHP problem with wheezy+xcache... performance are very good about PHP scripts!

Only 8 parallel download are started.

You might be talking about a single browser.

The number of downloads in parallel is less important than total throughput.

lighttpd does not support SPDY or HTTP/2, though that may happen in the more distant future, so the number of parallel downloads for a single client will be the number of connections the client makes to the server.

Seeing php-fpm in 'top' is likely unrelated if you have configured lighttpd to serve the static content.

Aye definitively seems a browser thing
i was incorrectly comparing HTTP+lighttpd with HTTPS+google+SPDY.

Using server status i figure it out that the PHP was a request for another domain that has PHP,
so just ignore it.

Sorry!