Deactivate unnecessary plugins
even you don’t insert specific functions of a plugin, it could be still referred by a post or page.
You can easily trace out by ‘Query Monitor’
Tune up CDNs like CloudFlare
The default option is minimal effort.
Page Rules – exempt wp-admin area.
Caching – Extend the period of ‘Browser Cache TTL’, more than a week.
Speed – check all ‘Auto Minify’ options
Tune-up w3 total cache
I got helped by this post
please refer to the above post for fine-tune.
For More Detailed Information. Always thanks for your contributions.