Page Speed Analyzer
Analyze your HTML source code for page weight, resource efficiency, and render-blocking issues. Identify the factors that slow down your page and get actionable recommendations to improve load times.
- 8 performance checks covering document size, scripts, styles, and images
- Render-blocking resource detection for scripts in the <head> section
- All analysis runs locally in your browser -- your code stays private
How to Analyze Your Page Speed
Evaluate your page weight and resource efficiency in four straightforward steps.
Get Your Page Source
Right-click on your page and select "View Page Source" to get the raw HTML. Copy the entire content.
Paste the HTML
Paste your full HTML source into the analyzer. The tool examines the markup for resource efficiency signals.
Review the Analysis
The tool evaluates 8 performance categories including document size, script count, render-blocking resources, and image optimization.
Optimize and Re-test
Implement the recommendations for each failing or warning check, then re-test to verify improvements.
Get Your Page Source
Right-click on your page and select "View Page Source" to get the raw HTML. Copy the entire content.
Paste the HTML
Paste your full HTML source into the analyzer. The tool examines the markup for resource efficiency signals.
Review the Analysis
The tool evaluates 8 performance categories including document size, script count, render-blocking resources, and image optimization.
Optimize and Re-test
Implement the recommendations for each failing or warning check, then re-test to verify improvements.
Page Speed, Core Web Vitals, and Their Impact on SEO
Page speed has been a confirmed Google ranking factor since 2010, but its importance has only grown. The 2021 Page Experience update elevated Core Web Vitals -- Largest Contentful Paint (LCP), First Input Delay (FID, now replaced by Interaction to Next Paint), and Cumulative Layout Shift (CLS) -- to explicit ranking signals. Google made it clear: fast, stable, responsive pages get a ranking advantage over slow ones, especially in competitive SERPs where content quality is roughly equal.
Beyond rankings, page speed directly impacts the metrics that matter most to businesses. Amazon famously found that every 100ms of added latency cost them 1% in sales. Google found that when page load time increases from 1 to 3 seconds, the probability of bounce increases by 32%. At 5 seconds, that probability jumps to 90%. These numbers are not theoretical -- they represent real revenue and real users who chose to leave rather than wait.
Understanding Page Weight and Resource Budgets
Page weight is the total size of all resources needed to fully render your page: the HTML document, CSS stylesheets, JavaScript files, images, fonts, and any other assets. Every byte must be downloaded before the browser can display a complete page. On a fast broadband connection, the difference between a 500 KB page and a 3 MB page might be negligible. But on a mobile connection -- where the majority of web traffic originates -- that difference translates to seconds of additional load time.
Performance budgets are a practical framework for managing page weight. A performance budget sets maximum size limits for different resource categories: 200 KB for JavaScript, 100 KB for CSS, 500 KB for images, and so on. These budgets are not arbitrary -- they are calculated based on the load time you want to achieve on your target devices and connection speeds. For a 3-second load time on a 3G connection, your total page weight should stay under approximately 1 MB.
Render-Blocking Resources and Critical Rendering Path
The critical rendering path is the sequence of steps the browser takes to convert your HTML, CSS, and JavaScript into a visible page. External stylesheets and synchronous scripts in the <head> section are render-blocking -- the browser must download and process them before it can paint anything on screen. Every render-blocking resource adds to the time before First Contentful Paint (FCP), which is the moment users first see content appear.
The solution is to minimize render-blocking resources. For JavaScript, add the defer attribute to scripts that need DOM access, or async for independent scripts like analytics. For CSS, inline your critical above-the-fold styles (under 14 KB) directly in the HTML and load the full stylesheet asynchronously. This approach allows the browser to render the visible portion of the page in the first round trip, then load the remaining resources in the background.
Image Optimization and Lazy Loading
Images typically account for the largest share of page weight. Unoptimized images can easily add several megabytes to a page. Modern image optimization involves multiple strategies working together: compression (reducing file size without visible quality loss), format selection (WebP and AVIF offer 25-50% better compression than JPEG), responsive images (serving different sizes based on viewport width via srcset), and lazy loading (deferring off-screen images until they are about to enter the viewport).
The native loading="lazy" HTML attribute is now supported by all major browsers and is the simplest way to implement lazy loading. Apply it to every image below the fold. However, do not apply it to your Largest Contentful Paint (LCP) image -- typically the hero image -- because lazy loading defers the load, which directly hurts your LCP score. The LCP image should be eager-loaded, properly sized, and ideally preloaded with a <link rel="preload"> tag in the head.
Script and Stylesheet Management
Every external script and stylesheet adds an HTTP request, which on HTTP/1.1 connections means additional round trips. Even on HTTP/2 connections that support multiplexing, each resource still consumes bandwidth and CPU time for parsing and execution. The goal is to minimize the number of resources while ensuring each one is as small as possible.
Bundle your JavaScript into a minimal number of files, use tree-shaking to remove unused code, and split code by route so users only download what they need for the current page. For CSS, combine stylesheets, use PurgeCSS or similar tools to remove unused rules, and consider CSS-in-JS or utility frameworks that generate only the styles your components actually use. These optimizations are part of comprehensive technical SEO work that improves both Core Web Vitals scores and real-world user experience.
Frequently Asked Questions
Common questions about page speed, performance optimization, and SEO impact.
Want a full Core Web Vitals and performance audit?
Our technical SEO service includes real-user performance analysis, server-side optimization, image pipeline setup, and ongoing Core Web Vitals monitoring across your entire site.
Make Your Site Blazing Fast
Free tools identify the issues. Our technical SEO team delivers production-grade performance optimization with measurable Core Web Vitals improvements.