Core Web Vitals Guides & Page Speed Blog

Server rack receiving streams of AI crawler requests

Original Data Sep 27, 2026 · 12 min

Do AI Crawlers Slow Your Site? We Counted Every Hit

933 AI crawler requests, 4.3 MB served. What GPTBot, ClaudeBot and PerplexityBot really cost a small site, and which bots to keep.

Single page app window with route transitions and metric gauges

Chrome News Sep 27, 2026 · 13 min

Soft Navigations: Core Web Vitals Finally Work in Single Page Apps

Chrome 151 measures LCP, CLS and INP on every route change in React, Next.js and Vue apps. How to track it and what CrUX still misses.

Web page wireframe with ad blocks measured by a scanning grid

Chrome News Sep 27, 2026 · 12 min

CrUX Ad Metrics: Chrome Now Publishes How Heavy Your Ads Are

Google added Ad Count, Ad Density and two Ad Weight metrics to CrUX on 15 September 2026. What they measure and how ads hit your vitals.

Many dim legacy PageSpeed audit rows dissolving into particles and flowing into a smaller set of bright consolidated Lighthouse insight rows

Reference Aug 15, 2026 · 14 min

The PageSpeed Warnings Google Deleted (And What Replaced Them)

Lighthouse 13 removed or renamed about 30 audits. The full map from every old warning name to what the report calls it now, and whether the fix still matters.

AI search engines ChatGPT Perplexity and Claude replacing Google search with website speed optimization

GAIO Feb 7, 2026 · 8 min

Google is No Longer Your Only Boss: The AI Bot Optimization Guide

Stop optimizing for 2010. ChatGPT, Perplexity, and Claude are the new gatekeepers. Learn how to make your website a magnet for AI bots with technical GAIO strategy.

Comparison of Core Web Vitals tools including PageSpeed Insights, GTmetrix and WebPageTest

Comparison Feb 7, 2026 · 10 min

7 Best Core Web Vitals Tools in 2026 (Free & Paid Compared)

We tested PageSpeed Insights, GTmetrix, WebPageTest, and more. Here's which tools actually help you fix LCP, CLS, and INP.

Performance engineer fixing Core Web Vitals on laptop with green gauges

Expert Guide Mar 10, 2026 · 8 min

Should You Hire Someone to Fix Core Web Vitals?

When DIY fails and it's time to call in a pro. What to expect, what it costs, red flags to avoid, and the right questions to ask.

LCP speedometer illustration showing Largest Contentful Paint optimization

LCP Fix Mar 10, 2026 · 10 min

How to Fix LCP Without Losing Your Mind

Your LCP is probably slow because of one image. Here's every fix from fetchpriority to CDN config with real code examples.

CLS layout shift illustration showing page elements jumping during load

CLS Fix Mar 10, 2026 · 9 min

How to Fix CLS: Stop Your Pages From Jumping

Images without dimensions, late-loading ads, font swaps. Here's every cause and fix for Cumulative Layout Shift.

INP illustration showing user clicking button with fast 200ms response time

INP Fix Mar 10, 2026 · 9 min

How to Fix INP: Why Your Buttons Feel Sluggish

INP replaced FID and broke a lot of passing scores. Here's how to break up long tasks, defer scripts, and fix slow interactions.

WordPress Mar 10, 2026 · 11 min

Core Web Vitals WordPress: Every Fix, Plugin by Plugin

WP Rocket settings, Elementor tricks, WooCommerce image fixes, plugin audits. The complete WordPress performance guide.

Core Web Vitals illustration showing LCP CLS and INP speedometer metrics

Guide Feb 6, 2026 · 7 min

Core Web Vitals: The Only Guide That Doesn't Waste Your Time

Forget the 47-page whitepapers. Here's what actually matters for your Google rankings — LCP, CLS, and INP explained like you're a human.

Image compression illustration showing JPEG to WebP size reduction

LCP Fix Feb 5, 2026 · 5 min

How to Compress Images Without Looking Like Crap

Your hero image is 3MB and it's killing your LCP. Here's how to shrink it to 100KB without making it look like a 2003 flip phone photo.

JavaScript defer illustration showing render-blocking scripts removed from critical path

INP Fix Feb 4, 2026 · 7 min

Deferring JavaScript: Stop Blocking Your Render

That innocent-looking analytics.js file is blocking your entire page from loading. Here's how to use defer and async to fix INP and LCP.

Lazy loading illustration showing images appearing progressively as user scrolls

LCP Fix Feb 3, 2026 · 4 min

Lazy Loading: Stop Loading Stuff Nobody Sees

Why load 47 images when users only see 3? Save bandwidth and improve LCP by loading images only when users actually scroll to them.

Illustration of a stylized capital letter F swapping with a fallback font during web page load

Font Loading May 2, 2026 · 10 min

Web Font Loading That Doesn’t Tank Your Vitals

Web fonts are the silent LCP killer. Preload, swap, size-adjust, and the variable font cheat code in one place.

Illustration of a server rack streaming data to a browser window with a stopwatch measuring fast response time

TTFB May 2, 2026 · 10 min

TTFB Truth: Why Server Response Eats Your LCP Budget

Time to First Byte burns half your LCP budget before render starts. Cut it with CDN, caching, HTTP/3, and edge functions.

Illustration of split screen between rendered above the fold web page and CSS code blocks with a green checkmark

Critical CSS May 2, 2026 · 10 min

Critical CSS Without the Crying

Inline what your hero needs, defer the rest. The 14 KB rule, the media print swap, and the auto extraction tools that work.

Illustration of a browser window with floating third party script tag chips being filtered through a shield

Third Party May 2, 2026 · 11 min

Third Party Scripts Are Eating Your Page Speed

Audit, defer, partytown, lazy load. The full 2026 playbook for taming GTM, Meta Pixel, chat widgets, and ads.

Illustration of a glowing browser window with arrow lines streaming toward it suggesting preload prefetch and preconnect resource hints

Resource Hints May 2, 2026 · 11 min

Resource Hints in 2026: Every Tag You Need

preconnect, preload, fetchpriority, Speculation Rules. When each helps, when each hurts, and how to audit yours.

Split screen showing mobile and desktop Core Web Vitals scores side by side

Mobile May 11, 2026 · 11 min

CWV Passing Desktop But Failing Mobile? Here’s Why

4x CPU throttling, viewport CLS, srcset failures, touch event INP. Why mobile and desktop scores diverge and exactly how to fix the gap.

Shopify store with glowing speed gauges and green LCP metrics

Shopify May 11, 2026 · 12 min

Shopify LCP: Fix It Without Touching a Single Line of Code

App-injected scripts, Dawn theme lazy-loading your hero, predictive search JS. The no-dev fixes and the Liquid code fixes in one place.

Lighthouse beacon PageSpeed Insights and WebPageTest tool icons compared side by side

Tools May 11, 2026 · 11 min

Lighthouse vs PageSpeed Insights vs WebPageTest: Which One to Trust

Lab vs field, real browsers vs emulation, the score that Google actually uses. Which tool tells the truth and when to ignore which number.

Timeline showing FID being replaced by INP as Core Web Vital metric in March 2024

INP May 11, 2026 · 11 min

INP vs FID: What Actually Changed and Why Your Site Might Be Failing Now

FID only measured your first click. INP measures every click, every tap, every keystroke. Here’s what changed and how to fix it.

Next.js May 11, 2026 · 12 min

Next.js Performance Guide 2026: LCP, CLS, and INP in the App Router Era

next/image priority prop, next/font for zero CLS, RSC vs client components, dynamic imports. Every App Router performance pattern explained.

CWV monitoring dashboard with LCP CLS and INP gauges and alert notifications

Monitoring May 11, 2026 · 11 min

Core Web Vitals Monitoring: Know When Your Score Tanks Before Google Does

CrUX API, Lighthouse CI GitHub Actions, web-vitals + GA4 RUM setup. Free monitoring options and paid tools honestly compared.

Shopping cart with green performance speed lines and product image checkmarks

E-Commerce May 11, 2026 · 12 min

E-Commerce Core Web Vitals: Why Product Pages Are Failing (And the Exact Fix)

Dynamic price CLS, add-to-cart INP, hero product image LCP, variant selector slow re-renders. Platform-specific fixes for Shopify, WooCommerce, and Magento.