• 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.

I hope you can get good result from PageSpeed

you can also see a result without tune-up here

For More Detailed Information. Always thanks for your contributions.