view
permission exists, and is false, then all permissions for that content type/id are regarded as falseconfig.php options
;// limit number of permission-sets for different permission combination ids to help control memory usage
$config['permissionCache']['cache_limit'] = 3;
// time in seconds to cache entries for
$config['permissionCache']['cache_time'] = 7 * 86400;
// Prune 'false' entires, as this can be accurately represented with an absence
$config['permissionCache']['sparse'] = true;