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blazing fast.
Actionable performance guides with code examples.
Fix Core Web Vitals for Next.js, React, Astro, Nuxt, and more.
Vite 8 and Rolldown: What Actually Changes for React Apps
Vite 8 swaps Rollup for Rolldown, a Rust-based bundler. Learn what gets faster, what stays the same, and how to migrate a React app without breaking your production bundle.
Best Image Optimization Tools for Next.js and React Sites
A practical guide to Next.js image optimization, React image CDNs, WebP/AVIF, LCP hero images, Cloudinary, ImageKit, Imgix and build-time compression.
CSS vs JavaScript Animations: Which Is Faster for Core Web Vitals?
CSS animations are not automatically faster than JavaScript. Learn which animation properties hurt INP and CLS, when to use CSS, when JavaScript is safer, and how to ship smooth 60fps UI.
Astro Image Optimization: Fix LCP Without the Guesswork
Your Astro site's LCP is slow because of images. Here's how to fix it — from the lazy loading trap to Astro 6.1's codec-specific Sharp defaults, with measurable before-and-after results.
Next.js First Load JS: Which Imports Every Route Pays For
We measured when a module lands in the chunk every Next.js route downloads. It is not about how many routes import it — three of four routes can import a 205kB module and the fourth pays nothing.
Astro Performance: Zero JS by Default But Still Slow?
Astro ships zero JavaScript by default via islands architecture — so why do sites still get slow? Causes: client:load overuse, hydration, and heavy images.
Which Third-Party Scripts Hurt Core Web Vitals? (LCP & INP)
Find which analytics, chat, ads, and tracking scripts hurt LCP and INP. Audit third-party JavaScript, defer non-critical tags, and reduce main-thread blocking.
MUI Performance: What Path Imports Actually Fix (And What They Don't)
We benchmarked barrel vs path imports in MUI. Production bundles came out identical. The real cost is a 5.2x slower dev load, and 83% of it is six icons.
Next.js vs Nuxt Performance 2026: Benchmarks & When Each Wins
Which is faster — Next.js or Nuxt? We compare SSR throughput, build times, bundle sizes, and Core Web Vitals with real benchmark data, and show when each wins.
4 Things Making Your Vite Dev Server Slow (We Measured Each Fix)
We built a 3,000-component Vite fixture and benchmarked the four standard fixes. One is 9.5x; one barely matters once you've done the first. The order matters.
How to Use AI to Fix Core Web Vitals Issues
Learn how to use ChatGPT, Claude, and other AI tools to diagnose and fix LCP, CLS, and INP problems. Includes practical prompts and workflows for developers.
Best AI-Powered Website Performance Tools in 2026
A practical comparison of AI-enhanced performance monitoring tools including DebugBear, Vercel Analytics, SpeedCurve, and more. Find the right tool for your workflow.
Do You Still Need useMemo in React 19? Here's When It Matters
The React 19 Compiler handles memoization automatically—but not always. Learn the 4 cases where useMemo and useCallback still matter.
Nuxt Performance Optimization: Fix Core Web Vitals Issues
Nuxt site not hitting performance targets? Learn how to optimize images, fonts, data fetching, and component loading for better Core Web Vitals scores.
Next.js Performance Optimization: Fix Core Web Vitals Issues
Next.js site running slow? Learn how to fix common performance mistakes with Images, Server Components, fonts, and code splitting for better Core Web Vitals.
How to Improve Interaction to Next Paint (INP) Score
Failing INP after it replaced FID? Learn what causes slow interactions and how to optimize JavaScript, event handlers, and third-party scripts.
How to Fix Cumulative Layout Shift (CLS) and Stop Page Jumping
Layout shifts ruining your Core Web Vitals? Learn what causes CLS and how to fix it with code examples for images, fonts, ads, and dynamic content.
How to Improve LCP: Discovery Is an Offset, Bytes Are a Slope
We measured one hero image at six weights across five delivery methods, plus a real Next.js build. Preload changed nothing on a visible <img>. A missing sizes prop cost 1,660 ms - more than every other fix here combined.
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