There is no way I won’t reference by name, some people might need it asap 
Plugin Organizer - A plugin to disable plugins on individual pages and change the order that they are loaded in. (This helps with Pagespeed, for example you might have some unnecesaary plugins you don’t want to load in a specific page)
Asset CleanUp - Works superbly if combined with the above plugin, Additionally, you might wanna use a plugin on a script/styles bases (It reduces HTTP request)
Fast Velocity Minify - And if this is combined with the above two, it’s gonna make your page speed as light as possible (Use with caution, you might destroy a lot of stuff )
Google Analytics - An alternative to Jetpack - view visitor reports right in your Wordpress admin dashboard, and or Analytics Dashboard
Lazy Loader - Lazy loading plugin that supports images, iFrames, video and audio elements and uses lazysizes.js. With a manual modification of the markup, it is also possible to lazy load background images, scripts, and styles.