WordPress vs Next.js: A Brutally Honest Speed Comparison
The Test Setup
We pulled 50 real-world WordPress sites and 50 Next.js sites from similar industries — local service businesses, SaaS landing pages, and e-commerce storefronts. No cherry-picking.
Each site was tested using Google Lighthouse (mobile, 4G throttling) and WebPageTest (Virginia, Cable connection). We measured three runs per site and averaged the results. Every test used a fresh, uncached visit to simulate a first-time user.
Tools Used
- Google Lighthouse v12 (mobile preset)
- WebPageTest (Dulles, VA — Cable)
- Chrome DevTools Performance panel
- CrUX data where available
The Results
The gap was staggering. Here's the summary:
| Metric | WordPress (avg) | Next.js (avg) | Difference |
|---|---|---|---|
| Time to First Byte | 1.2s | 0.05s | 24x faster |
| Largest Contentful Paint | 4.8s | 0.9s | 5.3x faster |
| Total Blocking Time | 820ms | 45ms | 18x faster |
| Cumulative Layout Shift | 0.18 | 0.02 | 9x better |
| Full Page Load | 7.2s | 1.4s | 5.1x faster |
Not a single WordPress site in our sample scored above 75 on Lighthouse mobile. The average was 38. The Next.js average? 96.
Why the Gap Exists
WordPress isn't slow because it's old. It's slow because of how it works:
- Plugin overhead: The average WordPress site loads 20-30 plugins, each adding database queries and JavaScript
- Database on every request: WordPress queries MySQL on every single page load unless you bolt on caching plugins
- Render-blocking resources: Most themes ship unoptimized CSS and JavaScript bundles
- No static generation: Every page is dynamically rendered by PHP, even if the content hasn't changed in months
Next.js, by contrast, pre-renders pages at build time. The HTML is served from a CDN edge node closest to the user. No database. No server processing. Just static files delivered at network speed.
What This Means for Your Business
Speed isn't a vanity metric. It directly impacts revenue:
- Bounce rate: 53% of mobile users abandon sites that take over 3 seconds to load
- Conversion rate: Every 100ms of improvement increases conversions by up to 8%
- Google ranking: Core Web Vitals are a confirmed ranking signal — slow sites get buried
- User trust: A slow site signals an outdated, unreliable business
If your WordPress site loads in 4-5 seconds, you're losing roughly half your visitors before they ever see your content.
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