Practical guides, benchmarks, and real-world tests to help you optimize LCP, INP, and CLS without the marketing fluff.
Engineering-first deep dives into the pillars of modern WordPress performance.
Master LCP, CLS, and INP with surgical optimization techniques.
View Guides arrow_forward dnsUnbiased, high-concurrency stress tests of popular WP hosts.
View Benchmarks arrow_forward boltObject cache, Full-page cache, and Edge delivery strategies.
View Analysis arrow_forward imageNext-gen formats, lazy loading, and priority fetch hints.
View Techniques arrow_forward shopping_cartScaling massive stores without sacrificing dynamic performance.
View Solutions arrow_forward bug_reportProfiling slow plugins and database bottlenecks like a pro.
View Debugging arrow_forwardThe latest laboratory reports and performance case studies.
Incident: 2,400 Duplicate Orders in 6 Hours Root cause: a Cloudflare “Cache Everything” page rule overrode WooCommerce no-store headers on /checkout/ and /order-received/. The CDN cached the order confirmation page and served it to multiple users. Fix: Cloudflare Cache Rules (bypass for WooCommerce) Lessons Learned Never use “Cache Everything” without explicit WooCommerce exclusions. Set Cache-Control:…
A definitive guide to fixing CLS caused by late-loading fonts, unconstrained images, and dynamic injected content.
Raw benchmarks comparing Object Cache Pro and LiteSpeed Cache across 5 hosting environments and 3 database types.
Unbiased performance metrics from our lab. Last updated: Oct 2024.
| Provider | TTFB (ms) | LCP (ms) | Load Time (s) | Uptime | Verdict |
|---|---|---|---|---|---|
| Kinsta (Standard) | 145ms | 840ms | 1.2s | 99.99% | Excellent |
| Rocket.net | 82ms | 720ms | 0.9s | 100% | Top Tier |
| WP Engine | 188ms | 910ms | 1.4s | 99.98% | Great |
| SiteGround (GrowBig) | 312ms | 1,450ms | 2.1s | 99.95% | Average |
We’ve organized our best content into learning paths based on your specific performance goals.
The 80/20 of performance: simple fixes with the biggest impact.
Data-driven hosting and tech stack recommendations for your next build.
Advanced debugging, server tuning, and custom performance code.
No fluff, no sponsored junk. Just benchmarks, profiling tips, and WordPress optimization code snippets.
“Most WordPress performance advice is outdated or surface-level. At CoreVitalsLab, we treat performance as an engineering discipline. We test every hypothesis in the lab so you don’t have to guess.”
Founder & Lead Performance Engineer