PHP Realpath Cache is low on capactiy
PHP resolves the real path of files that are opened, scripts that are compiled
via require/include and caches these mappings in realpath cache for some
seconds (default 120 seconds). This cache should be large enough to hold
realpath mappings of all files that the application needs. The cache can be
increased from its default 8094 using the
realpath_cache_size INI setting.