Slow load times and poor responsiveness were hurting operations. This case shows how our WordPress speed optimization process improved Core Web Vitals and overall UX.
About the site’s problems
We audited with PageSpeed Insights/Lighthouse and GTmetrix to locate bottlenecks (as part of our Google PageSpeed optimization approach).
- GTmetrix performance: 59%
- PageSpeed (mobile): 26
- PageSpeed (desktop): 53
Key issues: overloaded server (high TTFB), unused functionality, render-blocking CSS/JS, and missing caching. We also set success targets: LCP ≤ 2.5s, INP ≤ 200ms, CLS ≤ 0
What we changed (method & actions)
WP Rocket setup
Configured page/browser caching and preloading to deliver static responses quickly and stabilize first views. This supports better LCP and Speed Index.
Perfmatters for load control
Disabled nonessential features (emojis, embeds, jQuery Migrate, etc.) to cut requests and main-thread work, reducing script weight and improving INP.
Fonts & third-party requests
Removed render-blocking font calls during initial paint; prioritized system/self-hosted fonts to reduce external handshakes and layout shifts (CLS).
Professional code cleanup
- JavaScript: minified and delayed noncritical scripts (defer/async) to keep the first paint unblocked.
- CSS: removed unused rules, generated critical CSS for above-the-fold, then loaded the rest asynchronously.
- Transport: tuned delivery with HTTP/3 and Brotli/gzip (for HTML/CSS/JS) and cache headers; CDN-ready if needed.
We validate in Lighthouse/PageSpeed (lab) and watch field data (CrUX / Search Console → Core Web Vitals) so wins hold up for real users.
Results
Desktop PageSpeed: 53 → 93 (Core Web Vitals improved; smoother UX and better SEO signals).
Mobile PageSpeed: 26 → 75 (faster first content, lower input delay)—reinforced by a phones-first focus consistent with our mobile optimization for WordPress websites
| Core Web Vitals | Scores before WordPress Website Optimization | Scores after WordPress Website Optimization |
| Desktop Google Pagespeed | 53 | 93 |
| Mobile Google Pagespeed | 26 | 75 |
| Mobile LCP (Largest Contentful Paint) | 17.6 sec | 1,4 sec |
| Desktop LCP (Largest Contentful Paint) | 3.4 sec | 0.8 sec |
| Mobile FCP (First Contentful Paint) | 4.9 sec | 1.4 sec |
| Desktop FCP (First Contentful Paint) | 1.2 sec | 0.5 sec |
| Mobile Speed Index | 24.6 sec | 3 sec |
| Desktop Speed Index | 5.6 sec | 0.9 sec |
After optimization, the Core Web Vitals was significantly improved, which had a positive effect on the perception of the site by search engines and users. If you have a slow website and want to speed it up, please contact us. We will audit and solve performance problems together!
