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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
94
GRADE
A
FIX
2
REVIEW
2
PASS
9
INFO
1

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
87
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
68
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
36
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

923 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

1.06 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

0 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

13.48 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.

1.06 s

Page Load Progression

2.8 s
5.7 s
8.5 s
11.3 s
14.2 s
17.0 s
19.8 s
22.7 s
Checks
14
9 PASS 2 REVIEW 2 FIX
D
Third-Party Impact
Action
98% third-party, 0 ms blocking
FIX
98% third-party, 0 ms blocking
Warning::
Third-party code accounts for 98% of page weight (24.1 KiB of 24.6 KiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-party
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
5 images, 0 KB saveable
REVIEW
5 images, 0 KB saveable
Info::
All images are well-optimized
5 images 7 KB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
25 KB transferred, 13 requests
PASS
25 KB transferred, 13 requests
Info::
Page weighs 27 KB (25 KB transferred)
Info::
13 HTTP requests
Info::
Estimated 0.01 g CO2 per page load
25 KB / 2.4 MB budget
25 KB transferred
13 requests
0.01 g CO2 per page load
Other 7.9 KiB 32%
HTML 7.4 KiB 30%
Images 6.7 KiB 27%
CSS 2.6 KiB 11%
0 2.4 MB 4.9 MB
Under budget
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
JS Execution Cost
No JS execution data
PASS
No JS execution data
Info::
No significant JS execution detected

Main Thread Breakdown

Other 54% Garbage Collection 20% Style & Layout 17% Script Evaluation 5%
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
JS Bundles
No JavaScript
PASS
No JavaScript
Info::
No JavaScript bundles
No JavaScript files loaded.
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
Page Weight Inventory
13 resources · 25 KB · 0 KB savings available
PASS
13 resources · 25 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 25 KB
Warning::
12 third-party resources (98% of weight)
13 resources · 24.6 KiB · 12 third-party Within 1MB page-weight target
Document 60% · 14.7 KiB
Image 27% · 6.7 KiB
CSS 11% · 2.6 KiB
Other 2% · 555 B
Network Waterfall
13 requests over 42287ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s FCP 923 ms LCP 1.1 shttps://history.com// https://history.com/ — 301 — 492 B — 5 ms — h2https://www.history.com/www.history.com/ https://www.history.com/ — 302 — 63 B — 32 ms — h2http://canalhistoria.es/canalhistoria.es/ http://canalhistoria.es/ — 307 — 0 B — 1 ms — http/1.1https://canalhistoria.es/canalhistoria.es/ https://canalhistoria.es/ — 307 — 0 B — 3.0 s — http/1.1http://canalhistoria.es/canalhistoria.es/ http://canalhistoria.es/ — 307 — 0 B — 2 ms — http/1.1https://canalhistoria.es/canalhistoria.es/ https://canalhistoria.es/ — 522 — 7.4 KiB — 19.5 s — h3https://canalhistoria.es/cdn-cgi/styles/main.csscanalhistoria.es/cdn-cgi/styles/mai... https://canalhistoria.es/cdn-cgi/styles/main.css — 200 — 2.6 KiB — 21 ms — h3https://canalhistoria.es/cdn-cgi/images/cf-icon-browser.pngcanalhistoria.es/cdn-cgi/images/cf-... https://canalhistoria.es/cdn-cgi/images/cf-icon-browser.png — 200 — 824 B — 20 ms — h3https://canalhistoria.es/cdn-cgi/images/cf-icon-ok.pngcanalhistoria.es/cdn-cgi/images/cf-... https://canalhistoria.es/cdn-cgi/images/cf-icon-ok.png — 200 — 1.3 KiB — 28 ms — h3https://canalhistoria.es/cdn-cgi/images/cf-icon-cloud.pngcanalhistoria.es/cdn-cgi/images/cf-... https://canalhistoria.es/cdn-cgi/images/cf-icon-cloud.png — 200 — 1.8 KiB — 27 ms — h3https://canalhistoria.es/cdn-cgi/images/cf-icon-server.pngcanalhistoria.es/cdn-cgi/images/cf-... https://canalhistoria.es/cdn-cgi/images/cf-icon-server.png — 200 — 1.7 KiB — 27 ms — h3https://canalhistoria.es/cdn-cgi/images/cf-icon-error.pngcanalhistoria.es/cdn-cgi/images/cf-... https://canalhistoria.es/cdn-cgi/images/cf-icon-error.png — 200 — 1.2 KiB — 27 ms — h3https://canalhistoria.es/favicon.icocanalhistoria.es/favicon.ico https://canalhistoria.es/favicon.ico — 522 — 7.3 KiB — 19.6 s — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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