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https://ampproject.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
91
GRADE
A
FIX
1
REVIEW
3
PASS
11
INFO
2

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

Mobile Desktop
92
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
81
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
91
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.

2.60 s

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

2.71 s

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

17 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.

2.60 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.

3.66 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
11 PASS 3 REVIEW 1 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (290.4 KiB of 290.7 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
B
JS Execution Cost
873ms total JS execution
REVIEW
873ms total JS execution
Warning::
https://cdn.ampproject.org/v0.mjs: 389ms CPU time
Warning::
https://amp.dev/: 265ms CPU time
Info::
Unattributable: 219ms CPU time
Warning::
Third-party scripts: 873ms (100% of total)

Main Thread Breakdown

Script Evaluation 37% Other 30% Style & Layout 24% Rendering 4% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://cdn.ampproject.org/v0.mjs389ms305ms1ms3rd
https://amp.dev/265ms4ms1ms3rd
Unattributable219ms11ms0ms3rd
B
JS Bundles
14 scripts, 58 KB unused
REVIEW
14 scripts, 58 KB unused
Warning::
https://cdn.ampproject.org/v0.mjs: 34 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.ampproject.org/v0/amp-analytics-0.1.mj...: 25 KB unused (87%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 58 KB
58 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.ampproject.org/v0.mjs62 KB34 KB (54%)✓3rd
https://cdn.ampproject.org/v0/amp-analytics-0.1.mjs29 KB25 KB (87%)✓3rd
https://cdn.ampproject.org/v0/amp-animation-0.1.mjs16 KB—✓3rd
https://cdn.ampproject.org/v0/amp-base-carousel-0.1.mjs8 KB—✓3rd
https://cdn.ampproject.org/v0/amp-bind-0.1.mjs14 KB—✓3rd
https://cdn.ampproject.org/v0/amp-consent-0.1.mjs16 KB—✓3rd
https://cdn.ampproject.org/v0/amp-fx-collection-0.1.mjs5 KB—✓3rd
https://cdn.ampproject.org/v0/amp-geo-0.1.mjs4 KB—✓3rd
https://cdn.ampproject.org/v0/amp-install-serviceworker-0.1.mjs2 KB—✓3rd
https://cdn.ampproject.org/v0/amp-position-observer-0.1.mjs3 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

B
HTTP Caching
private
REVIEW
private
Info::
Cache-Control header is set
Got: private
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
A+
Page Weight Budget
291 KB transferred, 26 requests
PASS
291 KB transferred, 26 requests
Info::
Page weighs 874 KB (291 KB transferred)
Info::
26 HTTP requests
Info::
Estimated 0.06 g CO2 per page load
291 KB / 2.4 MB budget
291 KB transferred
26 requests
0.06 g CO2 per page load
JavaScript 165.3 KiB 57%
Images 52.0 KiB 18%
HTML 27.3 KiB 9%
Fonts 27.2 KiB 9%
Other 12.9 KiB 4%
Other 5.5 KiB 2%
Other 549 B 0%
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+
Image Optimization
3 images, 0 KB saveable
PASS
3 images, 0 KB saveable
Info::
All images are well-optimized
3 images 52 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
3 fonts (27 KB)
PASS
3 fonts (27 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

27 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 2.6 s LCP 2.7 shttps://amp.dev/static/fonts/poppins-v5-latin-700.woff2poppins-v5-latin-700.woff2 https://amp.dev/static/fonts/poppins-v5-latin-700.woff2 — 7.8 KiB — 46 ms — font-display: swaphttps://amp.dev/static/fonts/noto-sans-v7-latin-700.woff2noto-sans-v7-latin-700.... https://amp.dev/static/fonts/noto-sans-v7-latin-700.woff2 — 9.6 KiB — 48 ms — font-display: swaphttps://amp.dev/static/fonts/noto-sans-v7-latin-regular.woff2noto-sans-v7-latin-regu... https://amp.dev/static/fonts/noto-sans-v7-latin-regular.woff2 — 9.8 KiB — 37 ms — font-display: swap
poppins-v5-latin-700.woff2 woff2 swap
Size 8 KB
Load time 46 ms
Start 261 ms
Risk FOUT — text flashes from fallback to web font
noto-sans-v7-latin-700.... woff2 swap
Size 10 KB
Load time 48 ms
Start 261 ms
Risk FOUT — text flashes from fallback to web font
noto-sans-v7-latin-regu... woff2 swap
Size 10 KB
Load time 37 ms
Start 326 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
1
preload
2
dns-prefetch
—
prefetch
—

3 resource hints configured

A
Page Weight Inventory
26 resources · 291 KB · 58 KB savings available
PASS
26 resources · 291 KB · 58 KB savings available
Info::
Within 1MB page-weight target
Got: 291 KB
Info::
~58 KB of savings available
Warning::
25 third-party resources (100% of weight)
26 resources · 290.7 KiB · 25 third-party Within 1MB page-weight target
JavaScript 61% · 178.2 KiB
Image 20% · 57.0 KiB
Document 9% · 27.5 KiB
Font 9% · 27.2 KiB
Other 0% · 800 B

~58.5 KiB of savings available

Remove unused JavaScript: 58.5 KiB
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

Network Waterfall
26 requests over 750ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 2.6 s LCP 2.7 shttps://ampproject.org// https://ampproject.org/ — 302 — 249 B — 50 ms — h2https://www.ampproject.org/www.ampproject.org/ https://www.ampproject.org/ — 301 — 251 B — 13 ms — h2https://amp.dev/amp.dev/ https://amp.dev/ — 200 — 27.3 KiB — 146 ms — h2https://amp.dev/static/fonts/poppins-v5-latin-700.woff2amp.dev/static/fonts/poppins-v5-lat... https://amp.dev/static/fonts/poppins-v5-latin-700.woff2 — 200 — 7.8 KiB — 46 ms — h2https://amp.dev/static/fonts/noto-sans-v7-latin-700.woff2amp.dev/static/fonts/noto-sans-v7-l... https://amp.dev/static/fonts/noto-sans-v7-latin-700.woff2 — 200 — 9.6 KiB — 48 ms — h2https://cdn.ampproject.org/v0.mjscdn.ampproject.org/v0.mjs https://cdn.ampproject.org/v0.mjs — 200 — 62.3 KiB — 213 ms — h2https://cdn.ampproject.org/v0/amp-analytics-0.1.mjscdn.ampproject.org/v0/amp-analytics... https://cdn.ampproject.org/v0/amp-analytics-0.1.mjs — 200 — 29.5 KiB — 159 ms — h2https://cdn.ampproject.org/v0/amp-animation-0.1.mjscdn.ampproject.org/v0/amp-animation... https://cdn.ampproject.org/v0/amp-animation-0.1.mjs — 200 — 16.4 KiB — 198 ms — h2https://cdn.ampproject.org/v0/amp-base-carousel-0.1.mjscdn.ampproject.org/v0/amp-base-caro... https://cdn.ampproject.org/v0/amp-base-carousel-0.1.mjs — 200 — 8.1 KiB — 205 ms — h2https://cdn.ampproject.org/v0/amp-bind-0.1.mjscdn.ampproject.org/v0/amp-bind-0.1.... https://cdn.ampproject.org/v0/amp-bind-0.1.mjs — 200 — 13.6 KiB — 191 ms — h2https://cdn.ampproject.org/v0/amp-consent-0.1.mjscdn.ampproject.org/v0/amp-consent-0... https://cdn.ampproject.org/v0/amp-consent-0.1.mjs — 200 — 15.7 KiB — 205 ms — h2https://cdn.ampproject.org/v0/amp-fx-collection-0.1.mjscdn.ampproject.org/v0/amp-fx-collec... https://cdn.ampproject.org/v0/amp-fx-collection-0.1.mjs — 200 — 5.0 KiB — 216 ms — h2https://cdn.ampproject.org/v0/amp-geo-0.1.mjscdn.ampproject.org/v0/amp-geo-0.1.m... https://cdn.ampproject.org/v0/amp-geo-0.1.mjs — 200 — 3.6 KiB — 206 ms — h2https://cdn.ampproject.org/v0/amp-install-serviceworker-0.1.mjscdn.ampproject.org/v0/amp-install-s... https://cdn.ampproject.org/v0/amp-install-serviceworker-0.1.mjs — 200 — 2.4 KiB — 208 ms — h2https://cdn.ampproject.org/v0/amp-position-observer-0.1.mjscdn.ampproject.org/v0/amp-position-... https://cdn.ampproject.org/v0/amp-position-observer-0.1.mjs — 200 — 3.1 KiB — 211 ms — h2https://cdn.ampproject.org/v0/amp-selector-0.1.mjscdn.ampproject.org/v0/amp-selector-... https://cdn.ampproject.org/v0/amp-selector-0.1.mjs — 200 — 2.7 KiB — 208 ms — h2data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 64 64'%3E%3…www.w3.org/2000/svg' viewBox='0 0 6... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 64 64'%3E%3… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='%23fff' viewBox='0…www.w3.org/2000/svg' fill='%23fff' ... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='%23fff' viewBox='0… — 200 — 0 B — 0 ms — datahttps://amp.dev/static/fonts/noto-sans-v7-latin-regular.woff2amp.dev/static/fonts/noto-sans-v7-l... https://amp.dev/static/fonts/noto-sans-v7-latin-regular.woff2 — 200 — 9.8 KiB — 37 ms — h2https://amp.dev/manifest.jsonamp.dev/manifest.json https://amp.dev/manifest.json — 200 — 549 B — 105 ms — h2https://cdn.ampproject.org/rtv/012603032146000/v0/amp-auto-lightbox-0.1.mjscdn.ampproject.org/rtv/012603032146... https://cdn.ampproject.org/rtv/012603032146000/v0/amp-auto-lightbox-0.1.mjs — 200 — 2.9 KiB — 29 ms — h2https://cdn.ampproject.org/rtv/012603032146000/ww.mjscdn.ampproject.org/rtv/012603032146... https://cdn.ampproject.org/rtv/012603032146000/ww.mjs — 200 — 12.9 KiB — 29 ms — h2https://amp.dev/static/remote/https%253A%252F%252Fblog.amp.dev%252Fwp-content%252Fuploads%252F2021%252F12%252Funboxing-the-bento-component-library-768x384.pngamp.dev/static/remote/https%253A%25... https://amp.dev/static/remote/https%253A%252F%252Fblog.amp.dev%252Fwp-content%252Fuploads%252F2021%252F12%252Funboxing-the-bento-component-library-768x384.png — 200 — 52.0 KiB — 68 ms — h2blob:https://amp.dev/d25ae6bf-bc69-497f-a949-f7d5e4bcc333amp.dev/d25ae6bf-bc69-497f-a949-f7d... blob:https://amp.dev/d25ae6bf-bc69-497f-a949-f7d5e4bcc333 — 200 — -1 B — 20 ms — blobhttps://amp.dev/static/img/favicon.pngamp.dev/static/img/favicon.png https://amp.dev/static/img/favicon.png — 200 — 2.1 KiB — 157 ms — h2https://amp.dev/static/img/icons/icon-144x144.pngamp.dev/static/img/icons/icon-144x1... https://amp.dev/static/img/icons/icon-144x144.png — 200 — 2.9 KiB — 47 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 873ms · 90KB · €9/mo
cdn.ampproject.org
Other
Costly
Execution 389ms
Transfer 62 KB
Unused 54%
Monthly Cost €4/mo
amp.dev
Other
Costly
Execution 265ms
Transfer 27 KB
Monthly Cost €3/mo
Unattributable
Other
Costly
Execution 219ms
Transfer 0 KB
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • cdn.ampproject.org adds 389ms and costs ~€4/month
  • amp.dev adds 265ms and costs ~€3/month
  • Unattributable adds 219ms and costs ~€2/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

cdn.ampproject.org takes 389ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

54% of cdn.ampproject.org's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

amp.dev takes 265ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 219ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

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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