Free website performance audit
Check 11 factors that affect how fast your pages load. No signup required, results in under 60 seconds.
No signup required. Results in under 60 seconds.
What we check
Slow pages lose visitors. Large HTML, uncompressed responses, too many scripts, and unoptimized images all add seconds to load time. A performance audit shows you where the biggest wins are.
Page Size
Flags pages over 100 KB of HTML
JavaScript File Count
Warns when a page loads more than 10 script files
CSS File Count
Warns when a page loads more than 5 stylesheets
Response Compression
Checks that the server sends gzip or brotli compressed responses
Font Loading Strategy
Verifies font-display: swap or optional is used to prevent invisible text
Resource Hints (Preconnect)
Checks for preconnect hints to third-party origins
Render-Blocking Stylesheets
Flags stylesheets that block page rendering
Third-Party Scripts
Identifies external scripts that may slow down the page
Image Dimensions Set
Checks that images have width and height attributes to prevent layout shift
Image Lazy Loading
Flags below-the-fold images missing loading='lazy'
Responsive Images
Checks for srcset or picture elements for responsive image delivery
Example findings from a scan
Page size is 245 KB (warning threshold: 100 KB)
12 JavaScript files loaded (recommended max: 10)
No gzip or brotli compression detected
See how teams use SiteCurl:
Frequently asked questions
Does SiteCurl measure Core Web Vitals?
SiteCurl does not measure Core Web Vitals directly. It checks page size, compression, script count, image optimization, and other server-side performance factors.
How many performance checks does SiteCurl run?
SiteCurl runs 11 performance checks per page covering page size, scripts, stylesheets, compression, fonts, resource hints, render-blocking CSS, third-party scripts, and images.
Is this different from Lighthouse performance scores?
Yes. Lighthouse measures browser rendering metrics like LCP and CLS. SiteCurl checks server and markup-level performance factors that affect load speed.
Can I scan more than one page?
The free audit checks your homepage. With a paid plan, you can scan up to 50 pages per site and track performance over time.
Run a free performance audit