Autoptimize
WP Fastest Cache
WP Rocket
WP Super Cache
WP-Optimize
W3 Total Cache
Cachify
Hyper Cache
Event Espresso
Yoast
Jackmail
WP Rocket
Wordfence
The SEO Framework
Gravity Forms
MemberMouse
Autoptimize Event EspressoEvent Espresso might be a bit more popular than Autoptimize. We know about 1 link to it since March 2021 and only 1 link to Autoptimize. 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
Don't know if it makes complete sense for your use case but https://eventespresso.com/ is pretty powerful - I'd recommend checking it out. Source: over 2 years ago
WP Fastest Cache - The fastest and easiest wordpress cache plugin.
Yoast - Yoast offers plugins to improve SEO and optimize web sites and blogs.
WP Rocket - WP Rocket offers a caching plugin for Wordpress.
Jackmail - A newsletter plugin for Wordpress.
WP Super Cache - A very fast caching system for WordPress that produces static HTML files.
WP-Optimize - All-in-one WordPress plugin that does database cleaning, image compression, and site caching.