Teste de Velocidade de Site — Ferramenta online grátis

Website Speed Test: Measure & Optimize Your Site Performance

Website speed directly impacts user experience, search engine rankings, and conversion rates. Google has confirmed that Core Web Vitals are ranking signals, making page speed optimization essential for any website owner, developer, or SEO professional. Our free Website Speed Test gives you instant insight into your site's load performance and actionable recommendations to improve it.

Why Website Speed Matters for SEO and Conversions

Research consistently shows that faster websites perform better across every measurable metric. A one-second delay in page load time can reduce conversions by up to 7%, and 53% of mobile users abandon sites that take longer than 3 seconds to load. Google's algorithm considers page experience signals, including Core Web Vitals, when determining search rankings. Sites that pass all three Core Web Vitals thresholds gain a ranking advantage over slower competitors.

Beyond SEO, speed affects user trust. A slow-loading website creates a perception of unreliability. E-commerce sites are particularly sensitive — Amazon found that every 100ms of added latency cost them 1% in sales. Whether you run a blog, SaaS product, online store, or corporate website, speed is a fundamental pillar of digital success.

Understanding Core Web Vitals

Google's Core Web Vitals consist of three metrics that measure real-world user experience. Largest Contentful Paint (LCP) measures how quickly the main content of a page becomes visible. The target is under 2.5 seconds. LCP is influenced by server response time, resource load time, render-blocking resources, and client-side rendering. Common fixes include optimizing your largest image or text block, using a CDN, and implementing server-side caching.

Interaction to Next Paint (INP), which replaced First Input Delay (FID) in March 2024, measures the responsiveness of your page to user interactions throughout the entire page lifecycle. A good INP score is under 200 milliseconds. Heavy JavaScript execution, long tasks, and excessive DOM size are the primary causes of poor INP scores.

Cumulative Layout Shift (CLS) measures visual stability by tracking unexpected layout shifts during the page lifecycle. A CLS score below 0.1 is considered good. Layout shifts typically occur when images lack dimensions, ads inject dynamically, fonts swap causing text reflow, or content is injected above existing content. Setting explicit width and height attributes on images and using the CSS aspect-ratio property are effective solutions.

What This Ferramenta Measures

Our browser-based speed test provides several layers of analysis. The fetch test measures the actual network response time from your browser to the target server, giving you a real-world TTFB approximation from your location. The URL analysis checklist examines whether the site uses HTTPS, whether it redirects properly between www and non-www versions, and provides hints about compression and protocol usage.

For deeper analysis, the manual PageSpeed score input allows you to enter your Google PageSpeed Insights score and receive tailored recommendations based on your performance tier. Sites scoring below 50 need fundamental infrastructure changes, while sites in the 50-89 range benefit from targeted optimizations like image compression and code splitting.

How to Improve Website Speed

The most impactful speed optimizations start with the server. Ensure your hosting provider offers modern hardware, HTTP/2 or HTTP/3 support, and is geographically close to your audience. Implement server-side caching with tools like Redis, Varnish, or built-in CMS caching plugins. Enable GZIP or Brotli compression, which typically reduces transfer sizes by 60-80% for text-based resources.

On the front-end, optimize images by converting to modern formats like WebP or AVIF, implementing lazy loading for below-the-fold images, and serving responsive images with srcset. Minify and bundle CSS and JavaScript, defer non-critical scripts, and inline critical CSS for above-the-fold content. Use font-display: swap for web fonts to prevent invisible text during loading.

A Content Delivery Network (CDN) is one of the highest-impact changes you can make. CDNs like Cloudflare, Fastly, or AWS CloudFront cache your static assets on edge servers worldwide, reducing latency for users regardless of their location. Many CDNs also provide automatic image optimization, minification, and HTTP/3 support.

Common Speed Killers to Avoid

Third-party scripts are often the biggest hidden performance drain. Analytics trackers, chat widgets, social media embeds, and advertising scripts each add DNS lookups, TCP connections, and JavaScript execution time. Audit your third-party scripts regularly and remove any that do not directly contribute to business goals. Consider loading non-essential scripts after user interaction rather than on page load.

Unoptimized images remain the most common speed issue across the web. A single uncompressed hero image can weigh several megabytes, dwarfing the rest of your page resources combined. Use automated image optimization in your build pipeline or deployment workflow. Ferramentas like Sharp, Squoosh, or ImageOptim can reduce image file sizes by 50-90% without visible quality loss.