Most slow WordPress sites are slow for a handful of boring reasons. You do not need a week-long audit to find them. This is the 20-minute order I follow, and it works on any WordPress site.

Minutes 0-4: Measure before you touch anything

Run the homepage and one inner page (a post or product page) through PageSpeed Insights and note the mobile Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS) and Interaction to Next Paint (INP). Screenshot the numbers. Without a baseline you cannot tell whether a change helped.

Minutes 4-8: Images

Images are the most common cause of a slow LCP. Check whether the hero image is huge, not compressed, or lazy-loaded (the top image should not be lazy-loaded). Serve WebP or AVIF, set width and height attributes, and make sure the theme is not loading a full-size file into a small slot.

Minutes 8-12: Plugins and theme weight

Open the Network tab and sort by size and by time. List every plugin that loads CSS or JavaScript on pages that do not use it (sliders, form plugins, page-builder add-ons). Deactivate what you do not need and unload scripts per page where you can. Two plugins that do the same job is a common find.

Minutes 12-15: Caching and hosting

Confirm page caching is on and that logged-out visitors get a cached page (check the response headers). Check the PHP version, since an old one is a free speed-up when plugins support the newer one. Look at time to first byte: if it is high even with caching, the host or the database is the bottleneck, not the front end.

Minutes 15-18: Fonts, third-party scripts and layout shift

Limit web fonts to the weights you actually use and preload the main one. List third-party scripts (chat widgets, trackers, embeds) and delay anything that is not needed for first paint. Give embeds and ads reserved space so the layout does not jump.

Minutes 18-20: Write down what you found

Re-test, compare against your baseline, and write a short list: what was fixed, what is left, and who owns it. That list is what a client or a boss actually wants to read.

Get the checklist

I keep this as part of a free 15-point SEO quick audit checklist you can print or copy: free checklist on Gumroad. It is pay-what-you-want.

I have run MGN Ventures, an SEO, WordPress and UI/UX studio, since April 2026. Questions or a step you do differently? Leave a comment.