I would suggest adding the following features to Hummingbird to make it a real one-stop solution for all WordPress Problems in terms of Speed and Optimization. Most of the features are already available spread all over several other plugins. Simply collect the best codes out of them and integrate them in an Open Source manner to Hummingbird. Thanks
It also would be nice to hear if some of that already has been integrated or what is coming up in the next update (when):
Remove query strings
Remove jQuery migrate
Remove WordPress version number
Remove wlwmanifest link
Remove RSD link
Disable scripts per page/post
Disable RSS feeds
Remove RSS feed links
Disable self pingbacks
Disable WordPress Heartbeat API
Change Heartbeat API frequency
Disable and Limit Post Revisions
Remove REST API links
Change autosave interval
Disable WooCommerce scripts and CSS on non WooCommerce Pages
close comments after 28 days
force pagination after 20 posts,
Remove Windows Live Writer tag
Remove Shortlink Tag
Remove WP API from header
Disable Author Pages
Disable loading dashicons on front end if admin bar disabled
Disable blog (comments, categories, tags, etc.)
Lazy load comments.
Disable automatic JPEG compression.
Preconnect, Prerender, Preload
Remove multiple instances of font awesome if loading from different plugins/themes
Lazy load images
Disable Google Fonts
Disable comments globally
Remove Yoast SEO comments in front-end HTML
Disable WooCommerce scripts and CSS on non-WooCommerce pages
Disable WooCommerce Reviews
Defer Woocommerce Cart Fragments
Disable Google Maps
Lazy load native WordPress comments
Detect and add favicon if missing? Causes 404 break-in speed tests
Sync Google Analytics locally
Remove /xmlrpc.php from code if XML-RPC is disabled
Remove WordPress API from code if WP-JSON is disabled
Remove WordPress API from header
Good to have would be:
A way to add a header Comment - which does not get removed by the optimization processes! Here Agencies and developers could place a Header comment i.e. - This site has been build by XYZ Agency - emailus.here - and lookatwebsite.there etc.
Super easy to use the plugin and doing what it says.
Removing Querystrings is important especially if you are behind Cloudflare etc.
With some code examples also here:
Currently not working on Multisite
but with code examples
Cookie Law is meanwhile NORMAL and required and it would be great if it could be integrated to without the need of another plugin,
Analytics Code - No need for a "zillion plugins to perform an easy task like inserting a verification meta tag (Google Search Console, Bing, Pinterest), a json-ld snippet or a custom stylesheet (Google Fonts, Print Styles, accessibility tweaks…)."
It would be great if also other CDNs even private ones could be integrated as the one WPMUDEV is offering seems not to be optimized - no gzip enabled and files are way to big!
Please give Hummingbird an extra kick with Caching
https://wordpress.org/plugins/cache-performance/ - it is simply working
Besides that get some stuff from here
https://wordpress.org/plugins/wp-image-compression/ to WP-Smush Pro
Important would also be a way to have the database cleaned.
A section for the Transient Cleaning would be just perfect similar to what the Transient Manager is doing
a very good plugin which gives you a great overview and it actually wold fit as is already into the dashboard of hummingbird i.e. in a Transient Tab.
and To do a database Optimization that ones functionality is just perfect
and it would be good to have a way not only lazy-load images but also lazy-load for videos
Please have also a look to Frank Goosens PLugin Autoptimize which does a much better job then Hummingbird right now, with much less clicks.
All of the above mentioned - perhaps even something like fastest or rocket cache could be intergated into Hummingbrid and someparts perhaps into Defender and WP-Smush
Besides those ideas above also some code should be able to be added via a click to the .htaccess, similar to how All In One Security is doing it
i.e. Add Expires Headers
and much more
This could be done similar to how the checklists are done in the wp-disable plugin. So people could decide by themselves what .htaccess code they would like to add without the need to actually write the code.
Also, a way to enable or disable a Plugin on certain pages could help to speed up all others
With it, you can also change the order that your plugins are loaded and group them or disable them by post types etc.