Can’t stress this one enough. When you’re developing, trying stuff out, making changes, all that is stored in the cache… Now all their ‘stuff’ has to load in each browser page load… for nothing. Also everytime a plugin is added or deleted or deactivated it is ALL CACHED. Failing to delete or reload that cache is the biggest sitespeed fail. Clear cache with WP Rocket before logging out of your site. When any changes are made to a website whether by clients or developers, the cache needs to be dumped and reloaded. Clear cache right before exiting and logging-out.

Learn WP Rocket… i.e. there is a DB tab on it especially good for WooCommerce users with tons of orders or older WP sites that are aged and have thousands of old revisions DB tables. In two clicks those are gone on that tab speeding things up. Here’s how to do that.

You can leave them there inactive if you want, but leaving unused plugins active is generally frowned upon in the community of speed hacks because every plugin loads on every page… read that again

Hummingbird in particular is bad and is usually part of that behemoth WPDev GUI that sits there doing zip loading analytics for the site. Always delete that plugin…and Hummingbird and install Wp Rocket instead.

Videos should only ever load once per client then store in browser cache. Here’s how to do that, and images shouldn’t be sized with the browser, but by hand to match the view port size on screen – no larger. Imagify – Already installed on WP Rocket can help as well.