settings.php alta performance (apc + memcache + authcache)

settings.php

<?php
# APC.
$conf['cache_backends'][] = 'sites/all/modules/contrib/apc/drupal_apc_cache.inc';
// $conf['cache_class_cache'] = 'DrupalAPCCache';
$conf['cache_class_cache_bootstrap'] = 'DrupalAPCCache';

# Memcache.
$conf['cache_backends'][] = 'sites/all/modules/contrib/memcache/memcache.inc';
$conf['lock_inc'] = 'sites/all/modules/contrib/memcache/memcache-lock.inc';
$conf['cache_default_class'] = 'MemCacheDrupal';
$conf['memcache_key_prefix'] = 'projeto_foo';
$conf['memcache_stampede_protection'] = TRUE;

# Authcache.
$conf['cache_backends'][] = 'sites/all/modules/contrib/authcache/authcache.cache.inc';
$conf['cache_backends'][] = 'sites/all/modules/contrib/authcache/modules/authcache_builtin/authcache_builtin.cache.inc';
$conf['authcache_p13n_frontcontroller_path'] = 'authcache.php';

# Cache de DB para forms.
$conf['cache_class_cache_form'] = 'DrupalDatabaseCache';