Joomla site- memcache and First Contentful Paint (FCP) issues

Site is https://www,birminghamgoldcompany.co.uk

1/According to pagespeed the mobile site only scores 74 and there is LCP paint issues run the test and you will see. This needs fixing
2/ I wanted to use sitegrounds memcache BUT there is an issue with that and siteground suggested a developer To understand the issue please read this reply from siteground in relation to my query on memcache When I tried to install memcache I got 500 errors on all [ages.
As previously discussed, this is a PHP error due to the fact that $memcached_server_host is already declared once in the code. This is not related to any server-side configuration and it is related to the PHP code of the application.
Most likely the issue is that $memcached_server_host appears twice in the configuration.php file. There is a thread in the Joomla forum for a similar error here: https://forum.joomla.org/viewtopic.php?t=957617

Please show an understanding of these 2 issues in your reply. I dont want website design nor seo etc
I know this is a 1 hour job max to the right person and if it is done right then in future via pph I would ask that person to develop our website in the future



Best Regards,

Emanuil Kostadinov
Technical Support Team