My WordPress admin slowness
I have an issue is my wordpress admin loading slowness
1) My multisite is hosted on my dedicated server and my server only have one site are hosted on my server.
2) I've increased my site memory up to 2GB
3) I've 35 plug- in installed on my site
4) I've been tried to deactivated all my plug in and re-activated it one by one, wont work.
5) When I'm editing on my back end sometimes i got "An error occurred while establishing a database connection" and i refresh it again it will going be fine.
6) I have installed Heartbeat Control, WP Rocket,WP Super Cache - Clear all cache,WP-Memory-Usage,WP-Optimize plug-in to speed up my site.
7) My site is just new it is under construction not open for public so that is no any data and post on my site yet.
Can you help me to take a look my site what is the problem ?