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 GuidesUnbiased, high-concurrency stress tests of popular WP hosts.
View BenchmarksObject cache, Full-page cache, and Edge delivery strategies.
View AnalysisNext-gen formats, lazy loading, and priority fetch hints.
View TechniquesScaling massive stores without sacrificing dynamic performance.
View SolutionsProfiling slow plugins and database bottlenecks like a pro.
View DebuggingThe latest laboratory reports and performance case studies.
Time to First Byte (TTFB) is the time between a browser requesting your page and receiving the first byte of the response. Google considers anything under 800ms “Good” for TTFB — but in practice, anything above 200ms will hurt your LCP score and, indirectly, your rankings. This guide covers every cause of slow TTFB in…
Cloudflare APO (Automatic Platform Optimization) is one of the most impactful single changes you can make to WordPress performance. Unlike traditional CDNs that only cache static assets (images, CSS, JS), APO caches your entire HTML pages at Cloudflare’s 300+ global edge locations. I tested it on 5 different WordPress sites over 3 weeks. Here’s what…
WP Rocket and LiteSpeed Cache are the two most popular WordPress caching plugins — but they serve very different use cases. I tested both on identical hardware with identical WordPress setups over 4 weeks. Here’s exactly what the data shows. Quick Summary WP Rocket LiteSpeed Cache Price $59/year (1 site) Free Requires LiteSpeed server? No…
Unbiased performance metrics from our lab. Historical Data (Aug 2026).
| 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