Resources: http://ey.io/opcaches
Transcript: https://support.cloud.engineyard.com/entries/27416486-Transcript-PHP-Performance-I-Everything-You-Need-to-Know-About-OpCode-Caches-Screencast
Slides: https://speakerdeck.com/dshafik/php-performance-i-everything-you-need-to-know-about-opcode-caches
Tutorial: https://support.cloud.engineyard.com/entries/26902267-PHP-Performance-I-Everything-You-Need-to-Know-About-OpCode-Caches
