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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
3
REVIEW
3
PASS
9
INFO
2

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

Mobile Desktop
33
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
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.
92
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.

8.02 s

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

14.12 s

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

1.24 s

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

0.026

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

8.02 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.

14.83 s

Page Load Progression

479 ms
957 ms
1.4 s
1.9 s
2.4 s
2.9 s
3.4 s
3.8 s
Checks
17
9 PASS 3 REVIEW 3 FIX
F
Page Weight Budget
Action
8.9 MB transferred, 60 requests
FIX
8.9 MB transferred, 60 requests
Critical::
Page weighs 14.0 MB (8.9 MB transferred)
Info::
Fonts are 1.1 MB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 1.1 MB
Warning::
JavaScript is 653 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 653 KB
Info::
60 HTTP requests
Info::
Estimated 1.9 g CO2 per page load
8.9 MB / 2.4 MB budget
8.9 MB transferred
60 requests
1.9 g CO2 per page load
Other 6.5 MiB 73%
Fonts 1.1 MiB 13%
JavaScript 653.2 KiB 7%
Images 473.4 KiB 5%
CSS 114.5 KiB 1%
HTML 33.5 KiB 0%
Other 27.6 KiB 0%
Other 864 B 0%
Other 765 B 0%
0 2.4 MB 4.9 MB
Over budget

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

F
JS Execution Cost
Action
5913ms total JS execution
FIX
5913ms total JS execution
Warning::
https://api.mapbox.com/mapbox-gl-js/v3.2.0/mapbox-...: 2771ms CPU time
Warning::
Unattributable: 988ms CPU time
Warning::
https://wikimediafoundation.org/: 804ms CPU time
Warning::
https://wikimediafoundation.org/_static/??/wp-cont...: 775ms CPU time
Info::
https://wikimediafoundation.org/_static/??/wp-cont...: 229ms CPU time
Warning::
Third-party scripts: 3822ms (65% of total)

Main Thread Breakdown

Other 39% Script Evaluation 35% Style & Layout 16% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://api.mapbox.com/mapbox-gl-js/v3.2.0/mapbox-gl.js?ver=3.2.02771ms1178ms172ms3rd
Unattributable988ms154ms0ms3rd
https://wikimediafoundation.org/804ms69ms6ms1st
https://wikimediafoundation.org/_static/??/wp-content/themes/shiro/assets/dist/shiro-43ac71ac3ddf0c85495a.js,/wp-includes/js/jquery/jquery.form.min.js,/wp-includes/js/jquery/ui/core.min.js?m=1776363556j775ms242ms8ms1st
https://wikimediafoundation.org/_static/??/wp-content/plugins/mailchimp/assets/js/mailchimp.js,/wp-content/plugins/wikimedia-wordpress-annual-report-plugin/build/blocks/map/view.js?m=1776363555j229ms214ms1ms1st
https://wikimediafoundation.org/_static/??-eJyNzO0KgkAQheEbahvC1F/Rtag76eh+MbPr4t0nZhAR4d/D+xzIQXXeRXQRgkk9OYFMEwXU1KjAOBNmMNT+mM+jnOCQbxMZDeQo/jN2M9mzXp2IapxLjVGMwXNUr3K/evDm9fddHNCigAzEHhoRjAKaJILM/RVn5KX1ejlbcsdlxxSifBpynUl6rce9Gbyf3sXd3i51XRVVUZbV+ARJQoTP186ms105ms80ms1st
https://wikimediafoundation.org/_static/??-eJzTLy/QzcxLzilNSS3WzwKiwtLUokoopZebmaeXVayjj0+Rbm5melFiSSpUsX2uraG5uYmZkZmFhVkWAK/BIi8=97ms54ms11ms1st
https://piwik.wikimedia.org/piwik.js63ms55ms7ms3rd
D
JS Bundles
Action
14 scripts, 332 KB unused
FIX
14 scripts, 332 KB unused
Warning::
https://api.mapbox.com/mapbox-gl-js/v3.2.0/mapbox-...: 195 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://wikimediafoundation.org/_static/??-eJyNzO0...: 90 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://piwik.wikimedia.org/js/container_HBF2fCC3....: 26 KB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://wikimediafoundation.org/_static/??-eJzTLy/...: 21 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 332 KB
332 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://api.mapbox.com/mapbox-gl-js/v3.2.0/mapbox-gl.js?ver=3.2.0340 KB195 KB (58%)✓3rd
https://wikimediafoundation.org/_static/??-eJyNzO0KgkAQheEbahvC1F/Rtag76eh+MbPr4t0nZhAR4d/D+xzIQXXeRXQRgkk9OYFMEwXU1KjAOBNmMNT+mM+jnOCQbxMZDeQo/jN2M9mzXp2IapxLjVGMwXNUr3K/evDm9fddHNCigAzEHhoRjAKaJILM/RVn5KX1ejlbcsdlxxSifBpynUl6rce9Gbyf3sXd3i51XRVVUZbV+ARJQoTP159 KB90 KB (59%)✓1st
https://piwik.wikimedia.org/js/container_HBF2fCC3.js32 KB26 KB (84%)✓3rd
https://wikimediafoundation.org/_static/??-eJzTLy/QzcxLzilNSS3WzwKiwtLUokoopZebmaeXVayjj0+Rbm5melFiSSpUsX2uraG5uYmZkZmFhVkWAK/BIi8=35 KB21 KB (62%)✓1st
https://wikimediafoundation.org/_static/??/wp-content/themes/shiro/assets/dist/shiro-43ac71ac3ddf0c85495a.js,/wp-includes/js/jquery/jquery.form.min.js,/wp-includes/js/jquery/ui/core.min.js?m=1776363556j31 KB—✓1st
https://wikimediafoundation.org/_static/??/wp-content/plugins/mailchimp/assets/js/mailchimp.js,/wp-content/plugins/wikimedia-wordpress-annual-report-plugin/build/blocks/map/view.js?m=1776363555j3 KB—✓1st
https://wikimediafoundation.org/wp-includes/js/jquery/ui/datepicker.min.js?ver=1.13.311 KB—✓1st
https://wikimediafoundation.org/wp-includes/js/dist/script-modules/block-library/navigation/view.min.js?ver=b0f909c3ec791c3832101 KB—✓1st
https://wikimediafoundation.org/wp-content/plugins/hm-mega-menu-block/build/view.js?ver=8795d8d7cb03f34c22ae1 KB—✓1st
https://wikimediafoundation.org/wp-includes/js/dist/script-modules/interactivity/index.min.js?ver=66c613f68580994bb00a16 KB—✓1st

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

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

C
Image Optimization
Action
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Warning::
https://wikimediafoundation.org/wp-content/themes/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://wikimediafoundation.org/wp-content/themes/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
21 images 473 KB
0 oversized -0 KB
10 legacy format
2 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
Page Weight Inventory
Action
60 resources · 8.9 MB · 332 KB savings available
REVIEW
60 resources · 8.9 MB · 332 KB savings available
Warning::
Page weight 7.9 MB over 1MB target
Got: 8.9 MB Expected: ≤ 1 MB
Info::
~332 KB of savings available
Info::
24 third-party resources (5% of weight)
Info::
6 resources over 200KB
60 resources · 8.9 MiB · 24 third-party 7.9 MiB over 1MB target
Media 73% · 6.5 MiB
Font 13% · 1.1 MiB
JavaScript 7% · 653.2 KiB
Image 5% · 474.8 KiB
CSS 1% · 114.5 KiB
Document 0% · 33.5 KiB
Other 0% · 27.7 KiB

~332.2 KiB of savings available

Remove unused JavaScript: 332.2 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
5% third-party, 0 ms blocking
PASS
5% third-party, 0 ms blocking
Info::
Third-party code accounts for 5% of page weight (426.7 KiB of 8.9 MiB)
Info::
Third-party blocking time is low (0 ms)
95%
First-party Third-party
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+
Font Loading
3 fonts (1167 KB)
PASS
3 fonts (1167 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

1167 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 8.0 s LCP 14.1 shttps://wikimediafoundation.org/wp-content/themes/shiro/assets/src/fonts/inter.ttfinter.ttf https://wikimediafoundation.org/wp-content/themes/shiro/assets/src/fonts/inter.ttf — 433.2 KiB — 33 ms — font-display: swaphttps://wikimediafoundation.org/wp-content/themes/shiro/assets/src/fonts/montserrat.ttfmontserrat.ttf https://wikimediafoundation.org/wp-content/themes/shiro/assets/src/fonts/montserrat.ttf — 261.6 KiB — 52 ms — font-display: swaphttps://wikimediafoundation.org/wp-content/themes/shiro/assets/src/fonts/inter-italic.ttfinter-italic.ttf https://wikimediafoundation.org/wp-content/themes/shiro/assets/src/fonts/inter-italic.ttf — 472.5 KiB — 68 ms — font-display: swap
inter.ttf ttf swap
Size 433 KB
Load time 33 ms
Start 330 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
montserrat.ttf ttf swap
Size 262 KB
Load time 52 ms
Start 331 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
inter-italic.ttf ttf swap
Size 472 KB
Load time 68 ms
Start 331 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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)

Fixing the unchecked items could save ~934 KB and ~1868 ms

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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
—
dns-prefetch
1
prefetch
—

1 resource hints configured

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
HTTP Caching
max-age=300 (5 minutes)
PASS
max-age=300 (5 minutes)
Info::
Cache-Control header is set
Got: max-age=300, must-revalidate
Info::
Effective TTL: 5 minutes (max-age=300)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=300, must-revalidate

DirectiveValueMeaning
max-age300Cache for 5 minutes
must-revalidate—Must recheck with server after expiry
Effective TTL: 300 seconds
Network Waterfall
60 requests over 1972ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 8.0 s LCP 14.1 shttps://wikimediafoundation.org// https://wikimediafoundation.org/ — 200 — 33.5 KiB — 65 ms — h2https://wikimediafoundation.org/wp-includes/blocks/navigation/style.min.css?m=1774626884g/wp-includes/blocks/navigation/styl... https://wikimediafoundation.org/wp-includes/blocks/navigation/style.min.css?m=1774626884g — 200 — 2.6 KiB — 65 ms — h2https://wikimediafoundation.org/wp-includes/blocks/social-links/style.min.css?m=1774626884g/wp-includes/blocks/social-links/st... https://wikimediafoundation.org/wp-includes/blocks/social-links/style.min.css?m=1774626884g — 200 — 1.8 KiB — 39 ms — h2https://wikimediafoundation.org/wp-content/plugins/wikimedia-wordpress-annual-report-plugin/build/blocks/map/style-index.css?m=1776363555g/wp-content/plugins/wikimedia-wordp... https://wikimediafoundation.org/wp-content/plugins/wikimedia-wordpress-annual-report-plugin/build/blocks/map/style-index.css?m=1776363555g — 200 — 2.3 KiB — 37 ms — h2https://wikimediafoundation.org/_static/??/wp-includes/css/dashicons.min.css,/wp-content/plugins/wikimedia-wordpress-annual-report-plugin/build/frontend.css?m=1776363555/_static/??/wp-includes/css/dashico... https://wikimediafoundation.org/_static/??/wp-includes/css/dashicons.min.css,/wp-content/plugins/wikimedia-wordpress-annual-report-plugin/build/frontend.css?m=1776363555 — 200 — 51.4 KiB — 54 ms — h2https://api.mapbox.com/mapbox-gl-js/v3.2.0/mapbox-gl.css?ver=6.9.4api.mapbox.com/mapbox-gl-js/v3.2.0/... https://api.mapbox.com/mapbox-gl-js/v3.2.0/mapbox-gl.css?ver=6.9.4 — 200 — 5.2 KiB — 19 ms — h2https://wikimediafoundation.org/_static/??-eJx1zEEKwjAQQNELGQcpTVfiWdJkSIYmkyGTGnp7XYgo6Pbz+DDE+ModuYPkPRIrDNpIMJAz0vBOOCDT+iObTLydveoJPi49YUEFTdQqOFXsCoG0g/Yj45sT+7yHJ1xz9ZtCQheI40sV4r9SXHOxOUnf9laul2Wxk53m2T4AqrtQCg==/_static/??-eJx1zEEKwjAQQNELGQcpTVf... https://wikimediafoundation.org/_static/??-eJx1zEEKwjAQQNELGQcpTVfiWdJkSIYmkyGTGnp7XYgo6Pbz+DDE+ModuYPkPRIrDNpIMJAz0vBOOCDT+iObTLydveoJPi49YUEFTdQqOFXsCoG0g/Yj45sT+7yHJ1xz9ZtCQheI40sV4r9SXHOxOUnf9laul2Wxk53m2T4AqrtQCg== — 200 — 50.6 KiB — 57 ms — h2https://wikimediafoundation.org/_static/??-eJzTLy/QzcxLzilNSS3WzwKiwtLUokoopZebmaeXVayjj0+Rbm5melFiSSpUsX2uraG5uYmZkZmFhVkWAK/BIi8=/_static/??-eJzTLy/QzcxLzilNSS3WzwK... https://wikimediafoundation.org/_static/??-eJzTLy/QzcxLzilNSS3WzwKiwtLUokoopZebmaeXVayjj0+Rbm5melFiSSpUsX2uraG5uYmZkZmFhVkWAK/BIi8= — 200 — 34.8 KiB — 60 ms — h2https://wikimediafoundation.org/wp-content/plugins/lottie-lite/build/lottie.css?m=1776363555g/wp-content/plugins/lottie-lite/bui... https://wikimediafoundation.org/wp-content/plugins/lottie-lite/build/lottie.css?m=1776363555g — 200 — 597 B — 42 ms — h2https://wikimediafoundation.org/wp-content/uploads/2026/03/1024px-Bothrops_bilineatus_PN_Carrasco.jpg?resize=768,512/wp-content/uploads/2026/03/1024px-... https://wikimediafoundation.org/wp-content/uploads/2026/03/1024px-Bothrops_bilineatus_PN_Carrasco.jpg?resize=768,512 — 200 — 28.3 KiB — 56 ms — h2https://wikimediafoundation.org/wp-content/uploads/2026/02/Open-the-Knowledge-Journalism-Awards_Extended-Deadline.png?resize=600,338/wp-content/uploads/2026/02/Open-th... https://wikimediafoundation.org/wp-content/uploads/2026/02/Open-the-Knowledge-Journalism-Awards_Extended-Deadline.png?resize=600,338 — 200 — 27.9 KiB — 59 ms — h2https://wikimediafoundation.org/wp-content/uploads/2026/01/WP25_PRESS-RELEASE-GRAPHIC-1200X630.png?resize=768,403/wp-content/uploads/2026/01/WP25_PR... https://wikimediafoundation.org/wp-content/uploads/2026/01/WP25_PRESS-RELEASE-GRAPHIC-1200X630.png?resize=768,403 — 200 — 202.5 KiB — 61 ms — h2https://wikimediafoundation.org/wp-content/themes/shiro/assets/src/images/logo-stacked-reverse.svg/wp-content/themes/shiro/assets/src... https://wikimediafoundation.org/wp-content/themes/shiro/assets/src/images/logo-stacked-reverse.svg — 200 — 3.0 KiB — 7 ms — h2https://wikimediafoundation.org/wp-content/themes/shiro/assets/src/images/Wikipedia-logo-stacked-reverse.svg/wp-content/themes/shiro/assets/src... https://wikimediafoundation.org/wp-content/themes/shiro/assets/src/images/Wikipedia-logo-stacked-reverse.svg — 200 — 44.2 KiB — 16 ms — h2https://wikimediafoundation.org/_static/??-eJyNzO0KgkAQheEbahvC1F/Rtag76eh+MbPr4t0nZhAR4d/D+xzIQXXeRXQRgkk9OYFMEwXU1KjAOBNmMNT+mM+jnOCQbxMZDeQo/jN2M9mzXp2IapxLjVGMwXNUr3K/evDm9fddHNCigAzEHhoRjAKaJILM/RVn5KX1ejlbcsdlxxSifBpynUl6rce9Gbyf3sXd3i51XRVVUZbV+ARJQoTP/_static/??-eJyNzO0KgkAQheEbahvC1F/... https://wikimediafoundation.org/_static/??-eJyNzO0KgkAQheEbahvC1F/Rtag76eh+MbPr4t0nZhAR4d/D+xzIQXXeRXQRgkk9OYFMEwXU1KjAOBNmMNT+mM+jnOCQbxMZDeQo/jN2M9mzXp2IapxLjVGMwXNUr3K/evDm9fddHNCigAzEHhoRjAKaJILM/RVn5KX1ejlbcsdlxxSifBpynUl6rce9Gbyf3sXd3i51XRVVUZbV+ARJQoTP — 200 — 159.2 KiB — 25 ms — h2https://wikimediafoundation.org/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed366793375/wp-includes/js/dist/i18n.min.js?ve... https://wikimediafoundation.org/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed366793375 — 200 — 2.5 KiB — 20 ms — h2https://wikimediafoundation.org/_static/??/wp-content/themes/shiro/assets/dist/shiro-43ac71ac3ddf0c85495a.js,/wp-includes/js/jquery/jquery.form.min.js,/wp-includes/js/jquery/ui/core.min.js?m=1776363556j/_static/??/wp-content/themes/shiro... https://wikimediafoundation.org/_static/??/wp-content/themes/shiro/assets/dist/shiro-43ac71ac3ddf0c85495a.js,/wp-includes/js/jquery/jquery.form.min.js,/wp-includes/js/jquery/ui/core.min.js?m=1776363556j — 200 — 31.1 KiB — 31 ms — h2https://wikimediafoundation.org/wp-includes/js/jquery/ui/datepicker.min.js?ver=1.13.3/wp-includes/js/jquery/ui/datepicke... https://wikimediafoundation.org/wp-includes/js/jquery/ui/datepicker.min.js?ver=1.13.3 — 200 — 11.4 KiB — 22 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
65% of JavaScript execution is third-party
First-party Third-party 3822ms · 361KB · $51/mo
api.mapbox.com
Other
Costly
Execution 2771ms
Transfer 340 KB
Unused 58%
Monthly Cost $37/mo
Unattributable
Other
Costly
Execution 988ms
Transfer 0 KB
Monthly Cost $13/mo
piwik.wikimedia.org
Other
Optional
Execution 63ms
Transfer 22 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • api.mapbox.com adds 2771ms and costs ~$37/month
  • Unattributable adds 988ms and costs ~$13/month

65% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

api.mapbox.com takes 2771ms 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

58% of api.mapbox.com'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

Unattributable takes 988ms 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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