PHP Opcache Explained by Julien Pauli (video from PHP UK Conference 2014)
The title says it all. A VERY deep explanation on how OpCache works. If you never heard of this excellent
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PHP’s HipHop outperforms PHP 5.5 with Zend OPCache and Nginx by 15-20 times
A very interesting benchmark on www.alexfu.it shows excellent comparisons of plain PHP on Nginx (PHP 5.3 I think) PHP on