ZF2 Optimize for high traffic

Question

My ZF2 application seems to be extremely slow when more than 3 users are using it at the same time.

I profile my code with xdebug and webgrind and non of my function

Answer 1

If you are using Doctrine, don't forget to add a cache for annotations. This drastically improve performance (when I activate this cache I divide nearly by two the loading time). If you are using DoctrineORMModule:

'doctrine' => array(
    'driver' => array(

        'cache' => array(
            'class' => 'Doctrine\Common\Cache\ApcCache'
        ),

        'configuration' => array(
            'orm_default' => array(
                'metadata_cache' => 'apc',
                'query_cache'    => 'apc',
                'result_cache'   => 'apc'
            )
        ),
    )
)

However, it's quite inconvenient while developing because you must clear the cache whenever your mapping change.