Hello,
All PHP versions have received a very large number of new extensions available, one Essential: OPcache (best optimizer for all and memcached now), and which is now compatible with all PHP versions (before it was only in PHP 5.5) .
PHP 5.6 + OPcache or memcached are now the new standards of performance as long as your site is compatible.
https://support.yoorshop.hosting/knowledgebase/5/Technologies-supportees.html
Warning : do not enable extensions unnecessarily, as this can cause conflicts/slow downs...