Blog
Web performance guides, Core Web Vitals explainers, and speed optimization tutorials.
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PerformanceCI/CDPerformance Budgets
Website Performance Budgets: A Developer's Guide
Performance budgets set maximum constraints on page weight, timing, and request counts. Learn how to set them, enforce them in CI, and use them to prioritize work.
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CI/CDLighthouseGitHub Actions
How to Add Lighthouse to Your CI/CD Pipeline
Automate Lighthouse performance testing in GitHub Actions, GitLab CI, or CircleCI to catch regressions before they reach production.
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Core Web VitalsSEOGoogle Rankings
Core Web Vitals and Google Rankings Explained
Exactly how Google uses Core Web Vitals data for ranking, where to find your real metrics, and how to fix failing scores before they cost you organic traffic.
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SEOPerformanceCore Web Vitals
How Page Speed Affects SEO Rankings
Google confirmed page speed as a ranking factor in 2010 and expanded it with Core Web Vitals in 2021. Here's exactly how site speed affects your organic rankings.
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LighthousePerformanceBenchmarks
What Is a Good Lighthouse Performance Score?
Lighthouse scores range from 0–100. But what score should you actually aim for, and how much does it matter? Here's an honest answer.
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PerformanceBenchmarksCore Web Vitals
How Slow Is Too Slow? Website Speed Benchmarks
What's a good page load time? What LCP is acceptable? Use these benchmarks to understand where your site stands and what to aim for.
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PerformanceCI/CDChecklist
Pre-Deploy Performance Checklist
A practical checklist to run before every production deploy to catch performance regressions before your users do.
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AgenciesClient ReportingPerformance
How to Share Website Speed Reports with Clients
Clear performance reports build client trust and justify optimization work. Learn how to create, present, and explain speed test results to non-technical clients.
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AgenciesPerformanceClient Reporting
Website Performance Testing for Digital Agencies
How agencies can make performance testing a repeatable part of their workflow — from client audits to pre-launch testing to ongoing monitoring and reporting.
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E-commerceCore Web VitalsPerformance
Core Web Vitals for E-commerce: What Matters Most
E-commerce sites have unique performance challenges. Learn which Core Web Vitals matter most for product pages, category pages, and checkout flows.
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WordPressPerformanceCMS
WordPress Performance: Complete Speed Audit Guide
WordPress powers 40% of the web, but it's often slow by default. Learn how to audit your WordPress site and fix the most common performance bottlenecks.
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ShopifyE-commercePerformance
Website Speed Test for Shopify Stores
Slow Shopify stores lose sales. Learn how to test your store's performance, understand the unique constraints of Shopify, and improve LCP and Core Web Vitals.
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PerformanceFontsCLS
How to Optimize Web Fonts for Performance
Web fonts can block rendering and cause layout shifts. Learn how to load fonts efficiently using preloading, font-display, variable fonts, and system font fallbacks.
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PerformanceCDNTTFB
How to Use a CDN to Speed Up Your Website
A CDN distributes your content to servers around the world, reducing latency for all users. Learn how CDNs work, what they speed up, and how to get started.
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ToolsComparisonWebPageTest
WebPageTest Alternatives for 2026
WebPageTest is powerful but complex. Here are the best alternatives for developers who need detailed web performance diagnostics without the steep learning curve.
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ToolsLighthousePageSpeed Insights
Google PageSpeed Insights vs Lighthouse: Key Differences
PageSpeed Insights and Lighthouse both give you performance scores — but they're not the same tool. Learn exactly what makes them different and when to use each.
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ToolsComparisonGTmetrix
GTmetrix vs Google PageSpeed Insights: Which Should You Use?
GTmetrix and PageSpeed Insights are both popular speed testing tools — but they measure different things. Here's when to use each, and what each actually tells you.
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ToolsComparisonDebugBear
DebugBear Alternative: Free Website Speed Testing
Looking for a free DebugBear alternative? debugutils.dev gives you Lighthouse scores, Core Web Vitals, waterfall, filmstrip, and LCP analysis — no account required.
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ToolsSpeed TestingComparison
Best Website Speed Test Tools in 2026
Comparing the top website speed testing tools: debugutils.dev, Google PageSpeed Insights, GTmetrix, WebPageTest, and DebugBear. Which one should you use?
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PerformanceImagesJavaScript
How to Implement Lazy Loading on Your Website
Lazy loading defers off-screen images and content until users scroll near them. Learn how to implement it natively and where to be careful.
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PerformanceWaterfallDiagnostics
How to Audit Your Website's Request Waterfall
The request waterfall reveals exactly what your browser loads, in what order, and how long it takes. Learn to read it and use it to find the bottlenecks slowing down your page.
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CLSCore Web VitalsPerformance
How to Fix Cumulative Layout Shift (CLS)
Layout shifts frustrate users and hurt your Google rankings. Learn how to diagnose exactly which elements are shifting and apply targeted fixes to reach a CLS score under 0.1.
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TTFBPerformanceCaching
How to Improve TTFB with Server-Side Caching
A slow TTFB puts a floor on every other performance metric. Learn how full-page, edge, and object caching can cut your server response time to milliseconds.
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JavaScriptPerformanceTBT
How to Reduce JavaScript Bundle Size
Large JavaScript bundles are the #1 cause of slow TBT and high INP. Learn how to audit your bundle, remove unused code, and split it for faster load times.
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PerformanceImagesLCP
How to Optimize Images for Web Performance
Images are the biggest contributor to page weight and slow LCP. Learn how to choose the right format, compress effectively, serve responsively, and use lazy loading.
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PerformanceJavaScriptCSS
How to Fix Render-Blocking Resources
Render-blocking CSS and JavaScript delay the first paint of your page. Learn how to identify and eliminate them to dramatically speed up FCP and LCP.
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LighthousePerformanceSEO
What is a Lighthouse Score? (And Why It Matters)
Lighthouse scores your website on Performance, Accessibility, Best Practices, and SEO. Learn how each score is calculated, what the numbers mean, and how much weight to give them.
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PerformanceFCPLoading
What is FCP (First Contentful Paint)?
FCP marks the point when the browser renders the first piece of content. Learn what it means, how it differs from LCP, and how to speed it up.
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PerformanceTBTJavaScript
What is TBT (Total Blocking Time)?
TBT measures how long the main thread is blocked and unable to respond to user input. Learn what causes high TBT and how to reduce it to improve page responsiveness.
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PerformanceTTFBServer Performance
What is TTFB (Time to First Byte)?
TTFB measures how long it takes for the browser to receive the first byte of the page response. Learn why it matters, what causes a slow TTFB, and how to fix it.
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Core Web VitalsCLSPerformance
What is CLS (Cumulative Layout Shift)?
CLS measures how much your page shifts unexpectedly during load. Learn what causes layout shifts, how they're scored, and how to eliminate them for a better user experience.
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Core Web VitalsLCPPerformance
What is LCP (Largest Contentful Paint)?
LCP measures how quickly the main content of a page loads. Learn what it means, what counts as the LCP element, what causes a slow LCP, and exactly how to fix it.
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Core Web VitalsSEOPerformance
Core Web Vitals: The Complete Guide for Developers
Understand LCP, CLS, and INP — the three Core Web Vitals that Google uses to measure real-world page experience. Learn what each metric means.
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Speed TestingPerformanceGetting Started
How to Run a Free Website Speed Test (and Actually Understand the Results)
Most speed tests give you a score and nothing else. Here's how to run a proper test and read the results so you know exactly what's slow and how to fix it.