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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
2
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
83
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.

561 ms

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

2.21 s

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

133 ms

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

0.069

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

1.70 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.

2.85 s

Page Load Progression

543 ms
1.1 s
1.6 s
2.2 s
2.7 s
3.3 s
3.8 s
4.3 s
Checks
15
7 PASS 4 REVIEW 2 FIX
F
Page Weight Budget
Action
9.7 MB transferred, 85 requests
FIX
9.7 MB transferred, 85 requests
Critical::
Page weighs 14.7 MB (9.7 MB transferred)
Warning::
Images are 1.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.2 MB
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::
85 HTTP requests
Info::
Estimated 2.0 g CO2 per page load
9.7 MB / 2.4 MB budget
9.7 MB transferred
85 requests
2.0 g CO2 per page load
Other 6.5 MiB 67%
Images 1.2 MiB 13%
Fonts 1.1 MiB 12%
JavaScript 653.2 KiB 7%
CSS 114.5 KiB 1%
HTML 33.5 KiB 0%
Other 27.4 KiB 0%
Other 864 B 0%
Other 765 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

D
JS Bundles
Action
14 scripts, 331 KB unused
FIX
14 scripts, 331 KB unused
Warning::
https://api.mapbox.com/mapbox-gl-js/v3.2.0/mapbox-...: 194 KB unused (57%)
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: 331 KB
331 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 KB194 KB (57%)✓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
46 images, 0 KB saveable
REVIEW
46 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.
46 images 1.2 MB
0 oversized -0 KB
13 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
JS Execution Cost
Action
1918ms total JS execution
REVIEW
1918ms total JS execution
Warning::
https://wikimediafoundation.org/_static/??/wp-cont...: 719ms CPU time
Warning::
Unattributable: 388ms CPU time
Warning::
https://api.mapbox.com/mapbox-gl-js/v3.2.0/mapbox-...: 382ms CPU time
Warning::
https://wikimediafoundation.org/: 308ms CPU time
Info::
https://wikimediafoundation.org/_static/??/wp-cont...: 61ms CPU time
Info::
Third-party scripts: 770ms (40% of total)

Main Thread Breakdown

Other 48% Script Evaluation 28% Style & Layout 14% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
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=1776363556j719ms76ms3ms1st
Unattributable388ms44ms0ms3rd
https://api.mapbox.com/mapbox-gl-js/v3.2.0/mapbox-gl.js?ver=3.2.0382ms283ms39ms3rd
https://wikimediafoundation.org/308ms31ms2ms1st
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=1776363555j61ms56ms0ms1st
https://wikimediafoundation.org/_static/??-eJyNzO0KgkAQheEbahvC1F/Rtag76eh+MbPr4t0nZhAR4d/D+xzIQXXeRXQRgkk9OYFMEwXU1KjAOBNmMNT+mM+jnOCQbxMZDeQo/jN2M9mzXp2IapxLjVGMwXNUr3K/evDm9fddHNCigAzEHhoRjAKaJILM/RVn5KX1ejlbcsdlxxSifBpynUl6rce9Gbyf3sXd3i51XRVVUZbV+ARJQoTP60ms25ms34ms1st
C
Page Weight Inventory
Action
85 resources · 9.7 MB · 331 KB savings available
REVIEW
85 resources · 9.7 MB · 331 KB savings available
Warning::
Page weight 8.7 MB over 1MB target
Got: 9.7 MB Expected: ≤ 1 MB
Info::
~331 KB of savings available
Info::
24 third-party resources (4% of weight)
Info::
6 resources over 200KB
85 resources · 9.7 MiB · 24 third-party 8.7 MiB over 1MB target
Media 67% · 6.5 MiB
Image 13% · 1.2 MiB
Font 12% · 1.1 MiB
JavaScript 7% · 653.2 KiB
CSS 1% · 114.5 KiB
Document 0% · 33.5 KiB
Other 0% · 27.7 KiB

~331.0 KiB of savings available

Remove unused JavaScript: 331.0 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
4% third-party, 0 ms blocking
PASS
4% third-party, 0 ms blocking
Info::
Third-party code accounts for 4% of page weight (426.5 KiB of 9.7 MiB)
Info::
Third-party blocking time is low (0 ms)
96%
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 500 ms 1.0 s 1.5 s 2.0 s FCP 561 ms LCP 2.2 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 — 85 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 — 65 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 — 84 ms — font-display: swap
inter.ttf ttf swap
Size 433 KB
Load time 85 ms
Start 305 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 65 ms
Start 334 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 84 ms
Start 334 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
85 requests over 1996ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 561 ms LCP 2.2 shttps://wikimediafoundation.org// https://wikimediafoundation.org/ — 200 — 33.5 KiB — 19 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 — 16 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 — 17 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 — 21 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 — 46 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 — 45 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 — 41 ms — h2https://wikimediafoundation.org/_static/??-eJzTLy/QzcxLzilNSS3WzwKiwtLUokoopZebmaeXVayjj0+Rbm5melFiSSpUsX2uraG5uYmZkZmFhVkWAK/BIi8=/_static/??-eJzTLy/QzcxLzilNSS3WzwK... https://wikimediafoundation.org/_static/??-eJzTLy/QzcxLzilNSS3WzwKiwtLUokoopZebmaeXVayjj0+Rbm5melFiSSpUsX2uraG5uYmZkZmFhVkWAK/BIi8= — 200 — 34.8 KiB — 45 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 — 15 ms — h2https://wikimediafoundation.org/wp-content/uploads/2026/03/1024px-Bothrops_bilineatus_PN_Carrasco.jpg?resize=300,200/wp-content/uploads/2026/03/1024px-... https://wikimediafoundation.org/wp-content/uploads/2026/03/1024px-Bothrops_bilineatus_PN_Carrasco.jpg?resize=300,200 — 200 — 7.7 KiB — 37 ms — h2https://wikimediafoundation.org/wp-content/uploads/2026/02/Open-the-Knowledge-Journalism-Awards_Extended-Deadline.png?resize=300,169/wp-content/uploads/2026/02/Open-th... https://wikimediafoundation.org/wp-content/uploads/2026/02/Open-the-Knowledge-Journalism-Awards_Extended-Deadline.png?resize=300,169 — 200 — 11.7 KiB — 37 ms — h2https://wikimediafoundation.org/wp-content/uploads/2026/01/WP25_PRESS-RELEASE-GRAPHIC-1200X630.png?resize=300,158/wp-content/uploads/2026/01/WP25_PR... https://wikimediafoundation.org/wp-content/uploads/2026/01/WP25_PRESS-RELEASE-GRAPHIC-1200X630.png?resize=300,158 — 200 — 30.8 KiB — 37 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 — 5 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 — 24 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 — 15 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 — 9 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 — 21 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 — 32 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
40% of JavaScript execution is third-party
First-party Third-party 770ms · 340KB · $10/mo
Unattributable
Other
Costly
Execution 388ms
Transfer 0 KB
Monthly Cost $5/mo
api.mapbox.com
Other
Costly
Execution 382ms
Transfer 340 KB
Unused 57%
Monthly Cost $5/mo

These scripts may cost more than they're worth

  • Unattributable adds 388ms and costs ~$5/month
  • api.mapbox.com adds 382ms and costs ~$5/month

40% 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

Unattributable takes 388ms 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

api.mapbox.com takes 382ms 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

57% 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

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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