Defer JavaScript without breaking your site.

JavaScript is the single biggest cause of slow interactions and high Total Blocking Time on WordPress. Every synchronous script in the head pauses HTML parsing. Every long task on the main thread blocks user input. Every third-party tag — analytics, Pixel, chat widget, A/B test, heatmap — competes for the same single thread that the user is trying to scroll and tap on.

The default WordPress setup makes this much worse than it needs to be. Themes and plugins enqueue dozens of scripts synchronously. Page builders ship 200KB of JavaScript even on pages that need none of it. Tag managers fire ten third-party scripts before the page has even painted. The result is a site that scores 95 on a Mac in DevTools and feels broken on a real phone on 4G.

The fix is per-script deferral with a manual whitelist. We audit every enqueued script, identify which are render-blocking, which can defer safely, which need async, and which need to load behind user interaction. Sliders, lightboxes and lazy galleries get deferred. Analytics and Pixel get async. Chat widgets get lazy-loaded on idle or on hover. The heaviest third-party scripts get pushed to a Web Worker via Partytown so they can't block the main thread at all.

The testing is where most generic plugins fail. We test every key template — home, product, category, blog, checkout — after each change, watch for broken sliders, missed form submissions, and shifted layouts, and tune the rules until everything works. The deliverable is a faster site that still functions correctly, documented so future plugin additions can be handled the same way.