PHP 5.4 + xcache -> PHP 5.6 + Zend OpCache memory usage

In relatively unscientific tests, it seems moving from PHP5.4 with xcache to PHP 5.6 with Zend’s OpCache can lead to approximately 50% memory reduction.

(xcache was set to have a 64mb size, Zend OpCache is also using 64mb of memory).

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