Free website performance audit
Check the factors that affect how fast your pages load. No signup required, results in under 60 seconds.
No signup required. Results in under 60 seconds.
423,000+ checks run and counting
What we check
Slow pages lose visitors. Large HTML, no compression, too many scripts, and big images all add load time. Even a one-second delay can drop conversion rates. A quick audit shows you where the biggest wins are so you can fix what matters most.
Speed affects more than just user experience. Search engines use page speed as a ranking factor. Faster pages get more traffic and keep more visitors. Fixing speed issues often costs nothing and takes less than an hour.
Flags pages over 100 KB of HTML. Large pages take longer to download, especially on mobile.
Warns when a page loads more than 10 scripts. Each file adds a request that slows the page.
CSS File Count
Warns when a page loads more than 5 stylesheets. Fewer files mean fewer round trips.
Checks that the server sends gzip or brotli responses. Compression cuts file sizes by 60 to 80 percent.
Font Loading Strategy
Verifies font-display is set to swap or optional. Without it, text stays invisible while fonts download.
Checks for preconnect hints to outside servers. These save time by starting connections early.
Flags stylesheets that block page display. Moving or deferring them lets content show up faster.
Spots outside scripts that may slow the page. Each one adds a call you do not control.
Checks that images have width and height set. Without them, the page jumps around as images load.
Flags below-the-fold images missing loading='lazy'. Lazy loading saves data and speeds up first paint.
Checks for srcset or picture elements. These serve the right image size for each screen.
Surfaces site-level loading and responsiveness issues. This helps connect technical speed fixes to real user experience metrics.
These key speed checks cover common issues that slow down websites. From large pages to missing compression, each fix can cut seconds off load time. Run a scan to see where your site stands.
You do not need to be a developer to understand the results. Each finding tells you what is slow and what to do about it. Many fixes are simple server settings or image tweaks.
What to fix first
- Page Size: Flags pages over 100 KB of HTML. Large pages take longer to download, especially on mobile.
- JavaScript File Count: Warns when a page loads more than 10 scripts. Each file adds a request that slows the page.
- CSS File Count: Warns when a page loads more than 5 stylesheets. Fewer files mean fewer round trips.
How to use this audit
- Run the scan and identify which warnings appear across several pages, not just one template.
- Fix the problems that affect visibility, trust, or conversion first, then move on to polish items.
- Re-scan after each batch of changes so you can confirm the issue count actually drops.
Why this matters in the full scan
This category is most useful when you review it alongside the other six. A site can look good in one area and still lose traffic or trust because another area is weak. SiteCurl keeps these checks together so teams can work from one prioritized report instead of juggling separate tools.
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:
Deep dives for common findings:
Frequently asked questions
Does SiteCurl measure Core Web Vitals?
SiteCurl surfaces Core Web Vitals speed signals alongside server and markup factors. For full browser-lab CWV diagnostics, use Lighthouse or PageSpeed Insights.
How many performance checks does SiteCurl run?
SiteCurl runs key speed checks across page-level and site-level signals, including page size, scripts, stylesheets, compression, fonts, resource hints, CSS blocking, third-party scripts, images, and Core Web Vitals.
Is this different from Lighthouse performance scores?
Yes. Lighthouse measures browser metrics like LCP and CLS. SiteCurl checks server and markup factors that affect load speed. They work well together.
Can I scan more than one page?
The free audit checks your home page. With a paid plan, you can scan up to 100 pages per site and track speed over time.
What is the most common speed issue?
Large page sizes and missing compression are the two most common issues. Both are easy to fix with server config changes.
Will fixing these issues improve my search ranking?
Speed is a search ranking factor. Faster pages also keep more visitors on your site, which helps search engines see your content as useful.
Run a free performance audit