This is what we did for our customer to improve speed of page loading!

Steps are done by us to improve the speed of pages:-
– deleted extra folder
– deleted deactivated plugins
-> All In One WP Security
-> Better WordPress Minify
-> Force Regenerate Thumbnails
-> Multiple Featured Images
-> Jetpack by WordPress.com
-> Akismet
– update php version 5.4 to 7.0
– update wordpress version 4.7.13 to 5.2.1
– plugins update(Yoast SEO, WP Smush, Wordfence Security, Sucuri Security – Auditing, Malware Scanner and Hardening, Post Types Order, Google Analytics, Exploit Scanner, Category Order and Taxonomy Terms Order, Simple Page Ordering, Social Media Widget, WordPress Ad Widget, Really Simple CAPTCHA, Google XML Sitemaps, Custom Post Type UI, Jquery Validation For Contact Form 7, MailPoet Newsletters, Contact Form 7)
– pending(Advanced Custom Fields)
– update themes and delete extra(Twenty Fourteen, Twenty Thirteen, Twenty Twelve)
– optimize tables of database
– delete revisions of all pages
– Wordfence plugin setting was incomplete, we did and scan the site.

If you think your site need to improve the site speed please contact us.

Regards

SWG