Website and subdomain on WordPress.
Recently, a full speed optimization was carried out (document attached).
PC version - the version works quickly, mobile — slow.
Sites are still on multi-hosting, migration to VPS has not been done.
On the main site — 38 plugins, on the subdomain slightly fewer.
It is necessary to achieve fast loading of the mobile version of the site and the subdomain.
Also, periodically in the admin panel when editing pages, an error Error establishing a database connection appears (photo attached) — After which the site does not open. It is necessary to resolve this and, if needed, fully reconfigure the VPS.
The task needs to be completed quickly after familiarization.
I will send more information in private messages.
*please do not comment on the task publicly. Thank you*