Website Speed Test — Page Performance Checker
Test how fast your website loads. Get detailed performance metrics and recommendations to improve your page speed.
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✅ Free
By SwiftCalcTools Editorial Team · Formula verified
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How to Use Website Speed Test
- 1Enter the required values in the input fields above.
- 2Click the Calculate button or results update instantly as you type.
- 3View your results in the output panel below the inputs.
- 4Adjust any values to recalculate instantly.
Frequently Asked Questions
Studies show that 53% of mobile users abandon a site that takes more than 3 seconds to load. Aim for under 2 seconds for Time to First Byte (TTFB) and under 2.5 seconds for Largest Contentful Paint (LCP) — Google's Core Web Vitals threshold for "Good".
Core Web Vitals are Google's set of user experience metrics used as a ranking factor: LCP (loading speed, aim < 2.5s), FID/INP (interactivity, aim < 200ms), and CLS (visual stability, aim < 0.1). Sites that pass all three get a bonus in search rankings.
Common causes: large unoptimised images, too many HTTP requests, unminified CSS/JS, no browser caching, slow server/hosting, render-blocking resources, no CDN, large web fonts. Use PageSpeed Insights to identify which of these affect your site.
Key steps: compress and resize images (use WebP), enable GZIP/Brotli compression, minify CSS/JS/HTML, use a CDN, enable browser caching, defer non-critical JS, reduce server response time, and use lazy loading for images below the fold.