Case Study: WordPress Performance Optimization

A client approached me with a slow WordPress site. They were using LiteSpeed Cache, but the performance metrics were far from optimal:

• LCP: 6.5 s
• FCP: 3 s

What was done

1. LiteSpeed Cache reconfiguration
   LiteSpeed was used only for page caching, while other advanced optimization options were disabled to avoid conflicts.
2. Perfmatters plugin added and configured
   • Remove Unused CSS to reduce unnecessary code
   • Local Fonts to load fonts faster without external requests
   • Preload for key images
   • Delay JavaScript to defer non-critical scripts
3. Optimized workflow
   LiteSpeed handles caching only, while Perfmatters manages fine-tuned optimizations, improving page rendering and speed.

Results

• LCP: 6.5 s → 2.2 s
• FCP: 3 s → 1.7 s

Takeaway

Separating caching and fine performance optimizations can significantly improve Core Web Vitals without plugin conflicts, especially on dynamic or resource-heavy WordPress sites.

Written by Anton, founder of OSWOptimize and an SEO & Web Performance expert with 15+ years of experience optimizing WordPress sites, improving Core Web Vitals, and increasing search rankings.

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