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Check WCAG color contrast ratios between any two colors
Inspect HTTP response headers for any URL
Analyze SSL/TLS certificate details and chain
Look up DNS records for any domain
Trace the full redirect chain for any URL
Real-user INP and Core Web Vitals from Google's Chrome UX Report.
RESTful API for programmatic website audits
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Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
995 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.85 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
46 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.093
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.98 s
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
Downloaded but never executed on this page.
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
~336.6 KiB of savings available
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Main Thread Breakdown
public, max-age=0, s-maxage=86400
Web fonts
5
212 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Fixing the unchecked items could save ~127 KB and ~254 ms
This site is hosted on green energy infrastructure
Provider: Something Familiar
cdnjs takes 360ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
75% of cdnjs's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
How third-party costs are calculated
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473 ms
947 ms
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2.8 s
3.3 s
3.8 s