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Enterprise, Performance

WordPress PageSpeed 41 to 94: Core Web Vitals Case Study

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Client

B2B SaaS Company (White-Label — Digital Agency Partner)

Timeline

3 weeks

Scope

PageSpeed score increased from 41 to 94 (mobile); TTFB reduced to 148ms

Stack

Software / Marketing Technology

The Challenge

A rapidly growing B2B SaaS company was experiencing a significant loss of leads due to mobile load times consistently exceeding 6 seconds. This slow performance led to a drop in their Google Ads Quality Score, resulting in a 34% increase in cost-per-click, while their organic rankings for high-intent keywords began to decline. A third-party audit identified the root causes of this performance issue, including an unoptimized Elementor build, 14 render-blocking scripts, uncompressed image assets totaling over 40MB, and a complete lack of server-side caching.

Our Approach

Server Layer
Configured Redis object caching on the client's Kinsta environment, enabled Nginx FastCGI page caching, and tuned PHP-FPM worker pools to handle peak traffic without queue build-up.
Network Layer
Deployed Cloudflare CDN with custom cache rules for static assets, implemented HTTP/2 push for critical CSS, and enabled Brotli compression globally.
Application Layer
Refactored Elementor templates to eliminate render-blocking CSS/JS, converted all images to WebP format with responsive srcset attributes, implemented lazy loading, and deferred third-party scripts.
Database Layer
Optimized MySQL queries identified via slow query logging, removed transient bloat, and implemented scheduled database maintenance routines.

The Challenge

41 to 94
Google PageSpeed Insights mobile score: 41 → 94
1.8s to 148ms
TTFB reduced from 1.8s to 148ms (below HackProofWP's sub-200ms target)
5.9s to 1.4s
Largest Contentful Paint (LCP) improved from 5.9s to 1.4s
CLS
Cumulative Layout Shift (CLS) reduced to 0.02
CPC by 19%
Google Ads Quality Score improved by 2 points, reducing CPC by 19%
CTR 20% Increase
Organic click-through rate increased 28% within 60 days of deployment
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