Oxygen plugins installed: Oxygen, gutenberg integration, oxyextras, hydrogen

*if using callrail JS then you need to enable restapi

Under tools - schedule database optimization for :

Options >General 

Options > Assets

!(test deferring js) can cause issues

SETTING: Delay JS - ALL SCRIPTS 

Exclude: 

jquery-

jquery-migrate

/component-framework/vendor/aos/aos.js

AOS.init

oxygen_init_pro_menu

oxy-pro-menu-show-dropdown

oxygen_init_burger

oxy-pro-menu-dropdown-icon

callrail

js-extra

oxy-shape-divider

(document).ready

Enable: DELAY TIME OUT

Preloading

ENABLE: Instant pages on

Preload font files (local in perfmatters folder) example: https://domain.com/wp-content/cache/perfmatters/domain.com/fonts/iJWHBXyXfDDVXbF6iGmd8WD07oB-.woff2

DNS prefetch external links

Lazy Loading

(exclude images like logo, and above the fold images) AND/ OR test Exclude Leading images…

! IF using imagify and using the setting <picture> rewrite & "Add missing image Dimensions" is causing issues

Then Try adding CSS code: img { max-width:100%; height: auto;}

Fonts

Local Google fonts, on

CDN

test connection with cdn , we have seen higher TTFB due to latency of cdn

Analytics

See perfmatters documentation for up to date advice. https://perfmatters.io/docs/local-analytics/