Blog
Performance news, deep dives, and case studies. Updated weekly.
Original Data
Core Web Vitals in April 2026: The Data
Original analysis of CrUX data reveals 55.7% of origins now pass all three Core Web Vitals. SVG visualizations of year-over-year trends, framework CWV pass rates, CMS comparisons, and mobile vs desktop performance gaps across millions of origins.
Analysis
The State of Web Performance in 2026
10 million URLs analyzed from the HTTP Archive. Trends in framework adoption, mobile performance, and the growing gap between static and dynamic sites.
Comparison
Next.js vs Remix: Performance Showdown
Head-to-head CWV benchmarks for the two dominant React meta-frameworks.
Data & Analysis
Industry Analysis
Google's 2026 Core Web Vitals Update: What Changed and What to Do About It
Where Core Web Vitals stand two years after INP replaced FID: the subtle threshold clarifications, why INP is the hardest metric left, and how the rise of AI search reshapes what engineering teams should prioritize.
Industry Analysis
How AI Search Engines Evaluate Web Performance
Generative search engines pick citations differently than ten-blue-links ranking. A rigorous look at the retrieval -> rerank -> cite pipeline and why fast, schema-rich pages win 3x more citations in AI Overviews.
Original Data
Core Web Vitals in April 2026: The Data
55.7% of origins pass all three CWV. Year-over-year trends, framework rankings, CMS pass rates, and mobile vs desktop analysis with SVG visualizations.
Analysis
The State of Web Performance in 2026
We analyzed 10 million URLs from the HTTP Archive to understand where the web stands on Core Web Vitals.
Checklists
Announcements and roundups
Announcement
30 days, 105 pages, one thesis -- launch recap
The official wrap-up of our 30-day launch sprint: every section we shipped, every milestone we hit, and what month two looks like.
Roundup
Best of WebVitals.tools Q1 2026
A curated reading list -- the 12 must-read posts from our launch month, organized by topic. Read this if you only have an afternoon to get smart on web performance in 2026.
Framework Comparisons
Comparison
CDN Comparison 2026: Cloudflare vs Fastly vs Akamai vs Bunny vs Vercel Edge
Five major CDNs benchmarked on PoP coverage, regional TTFB, cache hit ratio, image optimization, and edge compute. Real numbers, not marketing claims.
Comparison
Vercel vs Netlify: 2026 Performance Showdown
A head-to-head look at edge networks, ISR, image optimization, cold starts, build performance, and Speed Insights across the two leading Jamstack hosts.
Comparison
Static vs Server-Side Rendering: Web Performance in 2026
SSG, ISR, SSR, and edge SSR compared on TTFB, LCP, hydration cost, INP, freshness, scaling, and SEO. Which rendering model wins for your workload?
Comparison
Lighthouse vs WebPageTest: Which Performance Tool Should You Use in 2026?
Lab vs synthetic accuracy, CWV measurement parity, real-device testing, automation, multi-step flows, filmstrips, and CI integration compared in detail.
Comparison
Next.js vs Remix: Web Performance Comparison 2026
Head-to-head Core Web Vitals benchmarks for the two dominant React meta-frameworks. LCP, CLS, INP, and TTFB data from real production sites.
Comparison
React vs Vue: Core Web Vitals Head-to-Head 2026
Data-driven comparison of React 19 and Vue 3.5 across LCP, CLS, INP, and TTFB. Benchmark data from 50,000 production origins.
Comparison
WordPress vs Shopify: Which Is Faster in 2026?
Core Web Vitals data from 700,000 origins reveals the real speed difference between WordPress and Shopify — and how to close the gap.
Case Studies
Case Study
How We Reduced LCP by 60%: A Step-by-Step Case Study
Detailed walkthrough of optimizing a Next.js e-commerce site's LCP from 4.8s to 1.9s. Covers image optimization, font loading, critical CSS, and third-party script management.
Case Study
Shopify CWV Case Study: +17% Conversions, $1.2M Mobile Revenue
Shopify Plus store cut LCP 4.7s to 1.9s and INP 312ms to 124ms in 12 weeks. Result: +17% mobile conversions, -24% bounce, $1.2M added annual revenue.
Tutorials
Tutorial
How to Measure Core Web Vitals: A Complete Guide
Step-by-step instructions for measuring LCP, CLS, and INP using Chrome DevTools, Lighthouse, PageSpeed Insights, CrUX, and the web-vitals JavaScript library.
Tutorial
How to Set Up Performance Monitoring
Build a real user monitoring (RUM) pipeline from scratch using the web-vitals library, Google Analytics 4, and open-source dashboards.
Tutorial
How to Optimize Images for Web Performance
A practical guide to modern image formats, responsive images, lazy loading, CDN delivery, and automated optimization pipelines that improve LCP and CLS.
Tutorial
How to Lazy Load Everything: Images, Videos, Components & More
Master lazy loading for images, iframes, video, fonts, JavaScript bundles, and React/Vue components with real code examples and performance measurements.
All Posts
Core Web Vitals
INP Optimization: Lessons from 50 Production Sites
We audited 50 production React and Vue applications and found the same INP patterns recurring across all of them.
Tooling
The Best Web Performance Testing Tools in 2026
A comprehensive comparison of Lighthouse, WebPageTest, SpeedCurve, Calibre, and the new generation of RUM tools.
Images
AVIF vs WebP: The 2026 Performance Comparison
We tested AVIF and WebP across 1,000 images at various quality levels. Here's when each format wins.
Architecture
Edge Rendering vs. SSG: A TTFB Comparison
When is edge rendering faster than static generation? We benchmarked both approaches across 12 global locations.
CSS
Critical CSS in 2026: Still Worth the Effort?
With HTTP/2 multiplexing and modern browsers, does inlining critical CSS still improve LCP? We tested it.
December 2025 Core Update: Performance Impact Analysis
How the latest Google core update changed the weighting of Core Web Vitals signals, and what it means for your site.