Based on our record, Autoptimize seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
The issues your site are having are troublesome for most small site administrators: good score on Desktop load but lousy on Mobile load. There are also good paid options for someone to professionally optimize the site using the above plugins (e.g. link), but do due dillgence before you hand over the keys (admin login) to any budget service to work on your WordPress installation, as it can end in tears. Source: over 2 years ago
WP Fastest Cache - The fastest and easiest wordpress cache plugin.
code-prettify - Code Prettify is an embeddable script that makes source-code snippets in HTML prettier.
WP Rocket - WP Rocket offers a caching plugin for Wordpress.
highlight.js - Highlight.js is a syntax highlighter written in JavaScript. It works in the browser as well as on the server.
WP Super Cache - A very fast caching system for WordPress that produces static HTML files.
Apache Tika - Apache Tika toolkit detects and extracts metadata and text from different file types.