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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
3
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
76
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
45
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.
82
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.

1.65 s

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

2.59 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.

2.12 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.

2.62 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
15
7 PASS 3 REVIEW 3 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 (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
73 resources · 1.5 MB · 85 KB savings available
FIX
73 resources · 1.5 MB · 85 KB savings available
Warning::
Page weight 537 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~85 KB of savings available
Warning::
72 third-party resources (100% of weight)
73 resources · 1.5 MiB · 72 third-party 537.4 KiB over 1MB target
Image 46% · 714.4 KiB
Font 28% · 445.0 KiB
JavaScript 20% · 308.4 KiB
CSS 4% · 65.0 KiB
Document 2% · 24.1 KiB
Other 0% · 4.5 KiB

~84.9 KiB of savings available

Remove unused JavaScript: 84.9 KiB
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
Page Weight Budget
1.5 MB transferred, 73 requests
REVIEW
1.5 MB transferred, 73 requests
Info::
Page weighs 2.4 MB (1.5 MB transferred)
Info::
Fonts are 445 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 445 KB
Info::
73 HTTP requests
Info::
Estimated 0.32 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
73 requests
0.32 g CO2 per page load
Images 712.8 KiB 46%
Fonts 445.0 KiB 28%
JavaScript 308.4 KiB 20%
CSS 65.0 KiB 4%
HTML 20.5 KiB 1%
Other 5.8 KiB 0%
Other 3.3 KiB 0%
Other 551 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

B
Image Optimization
27 images, 0 KB saveable
REVIEW
27 images, 0 KB saveable
Info::
All images are well-optimized
27 images 691 KB
0 oversized -0 KB
26 legacy format
0 missing dimensions CLS risk
B
JS Bundles
13 scripts, 85 KB unused
REVIEW
13 scripts, 85 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-6QZX...: 63 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ajax.googleapis.com/ajax/libs/jquery/1.10....: 22 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 85 KB
85 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-6QZXQMZZ6C144 KB63 KB (44%)✓3rd
https://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js?ver=1.10.133 KB22 KB (68%)✓3rd
https://www.niemanlab.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?11 KB—✓3rd
https://a.mailmunch.co/app/v1/site.js9 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js11 KB—✓3rd
https://www.niemanlab.org/wordpress/wp-content/plugins/niemanlab-exit-popup/assets/popup.js?ver=6.91 KB—✓3rd
https://www.niemanlab.org/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js4 KB—✓3rd
https://static.chartbeat.com/js/chartbeat.js16 KB—✓3rd
blob:https://www.niemanlab.org/5b424a01-50cc-464f-be99-0719ba1ad6b7-0 KB—✓3rd
https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js33 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

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
421ms total JS execution
PASS
421ms total JS execution
Info::
https://www.niemanlab.org/cdn-cgi/challenge-platfo...: 137ms CPU time
Info::
Unattributable: 111ms CPU time
Info::
https://www.niemanlab.org/: 108ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-6QZX...: 65ms CPU time
Warning::
Third-party scripts: 421ms (100% of total)

Main Thread Breakdown

Script Evaluation 53% Other 23% Style & Layout 12% Script Parsing & Compilation 6% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.niemanlab.org/cdn-cgi/challenge-platform/scripts/jsd/main.js137ms130ms2ms3rd
Unattributable111ms5ms0ms3rd
https://www.niemanlab.org/108ms16ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=G-6QZXQMZZ6C65ms52ms13ms3rd
A+
Font Loading
12 fonts (445 KB)
PASS
12 fonts (445 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

445 KB total

Render-blocking

0

of 12

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 1.6 s LCP 2.6 shttps://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-sans-pro-book.woff2freight-sans-pro-book.w... https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-sans-pro-book.woff2 — 12.2 KiB — 25 ms — font-display: swaphttps://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-sans-pro-bold.woff2freight-sans-pro-bold.w... https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-sans-pro-bold.woff2 — 12.6 KiB — 39 ms — font-display: swaphttps://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-sans-pro-book-italic.woff2freight-sans-pro-book-i... https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-sans-pro-book-italic.woff2 — 13.3 KiB — 37 ms — font-display: swaphttps://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-display-pro-bold.woff2freight-display-pro-bol... https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-display-pro-bold.woff2 — 26.0 KiB — 70 ms — font-display: swaphttps://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-text-pro-book.woff2freight-text-pro-book.w... https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-text-pro-book.woff2 — 13.7 KiB — 62 ms — font-display: swaphttps://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-text-pro-bold.woff2freight-text-pro-bold.w... https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-text-pro-bold.woff2 — 13.4 KiB — 37 ms — font-display: swaphttps://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-sans-pro-light.woff2freight-sans-pro-light.... https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-sans-pro-light.woff2 — 12.0 KiB — 57 ms — font-display: swaphttps://www.niemanlab.org/wordpress/wp-content/themes/Labby/resources/fontawesome-free-6.7.2/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.niemanlab.org/wordpress/wp-content/themes/Labby/resources/fontawesome-free-6.7.2/webfonts/fa-brands-400.woff2 — 116.4 KiB — 89 ms — font-display: swaphttps://www.niemanlab.org/wordpress/wp-content/themes/Labby/resources/fontawesome-free-6.7.2/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.niemanlab.org/wordpress/wp-content/themes/Labby/resources/fontawesome-free-6.7.2/webfonts/fa-solid-900.woff2 — 155.1 KiB — 90 ms — font-display: swaphttps://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-text-pro-book-italic.woff2freight-text-pro-book-i... https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-text-pro-book-italic.woff2 — 13.8 KiB — 63 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 42.0 KiB — 9 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff2 — 14.4 KiB — 8 ms — font-display: swap
freight-sans-pro-book.w... woff2 swap
Size 12 KB
Load time 25 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
freight-sans-pro-bold.w... woff2 swap
Size 13 KB
Load time 39 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
freight-sans-pro-book-i... woff2 swap
Size 13 KB
Load time 37 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
freight-display-pro-bol... woff2 swap
Size 26 KB
Load time 70 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
freight-text-pro-book.w... woff2 swap
Size 14 KB
Load time 62 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
freight-text-pro-bold.w... woff2 swap
Size 13 KB
Load time 37 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
freight-sans-pro-light.... woff2 swap
Size 12 KB
Load time 57 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 116 KB
Load time 89 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-solid-900.woff2 woff2 swap
Size 155 KB
Load time 90 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
freight-text-pro-book-i... woff2 swap
Size 14 KB
Load time 63 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 9 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 8 ms
Start 2.1 s
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)

Fixing the unchecked items could save ~136 KB and ~272 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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
73 requests over 2141ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.6 s LCP 2.6 shttps://niemanlab.org// https://niemanlab.org/ — 301 — 839 B — 1.0 s — h3https://www.niemanlab.org/www.niemanlab.org/ https://www.niemanlab.org/ — 200 — 20.5 KiB — 28 ms — h3https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-sans-pro-book.woff2www.niemanlab.org/wordpress/wp-cont... https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-sans-pro-book.woff2 — 200 — 12.2 KiB — 25 ms — h3https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-sans-pro-bold.woff2www.niemanlab.org/wordpress/wp-cont... https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-sans-pro-bold.woff2 — 200 — 12.6 KiB — 39 ms — h3https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-sans-pro-book-italic.woff2www.niemanlab.org/wordpress/wp-cont... https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-sans-pro-book-italic.woff2 — 200 — 13.3 KiB — 37 ms — h3https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-display-pro-bold.woff2www.niemanlab.org/wordpress/wp-cont... https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-display-pro-bold.woff2 — 200 — 26.0 KiB — 70 ms — h3https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-text-pro-book.woff2www.niemanlab.org/wordpress/wp-cont... https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-text-pro-book.woff2 — 200 — 13.7 KiB — 62 ms — h3https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-text-pro-bold.woff2www.niemanlab.org/wordpress/wp-cont... https://www.niemanlab.org/wordpress/wp-content/themes/Labby/webfonts/freight-text-pro-bold.woff2 — 200 — 13.4 KiB — 37 ms — h3https://www.niemanlab.org/wordpress/wp-content/themes/Labby/quickconcat.php?files=newfront-styles-simple.css,niemanlab-shared.css,animate-custom.css,resources/fontawesome-free-6.7.2/css/fontawesome.min.css,resources/fontawesome-free-6.7.2/css/brands.min.css,resources/fontawesome-free-6.7.2/css/solid.min.css,resources/fontawesome-free-6.7.2/css/regular.min.css,SIMPLE-shared.css&qwerdlzpwww.niemanlab.org/wordpress/wp-cont... https://www.niemanlab.org/wordpress/wp-content/themes/Labby/quickconcat.php?files=newfront-styles-simple.css,niemanlab-shared.css,animate-custom.css,resources/fontawesome-free-6.7.2/css/fontawesome.min.css,resources/fontawesome-free-6.7.2/css/brands.min.css,resources/fontawesome-free-6.7.2/css/solid.min.css,resources/fontawesome-free-6.7.2/css/regular.min.css,SIMPLE-shared.css&qwerdlzp — 200 — 49.9 KiB — 89 ms — h3https://www.niemanlab.org/wordpress/wp-content/plugins/niemanlab-exit-popup/assets/popup.css?ver=6.9www.niemanlab.org/wordpress/wp-cont... https://www.niemanlab.org/wordpress/wp-content/plugins/niemanlab-exit-popup/assets/popup.css?ver=6.9 — 200 — 4.5 KiB — 27 ms — h3https://www.niemanlab.org/wordpress/wp-content/themes/Labby/resources/niemansitelogos/foundation-logo-color.svgwww.niemanlab.org/wordpress/wp-cont... https://www.niemanlab.org/wordpress/wp-content/themes/Labby/resources/niemansitelogos/foundation-logo-color.svg — 200 — 1.5 KiB — 34 ms — h3https://www.niemanlab.org/wordpress/wp-content/themes/Labby/resources/niemansitelogos/lab-logo-color-tighter.svgwww.niemanlab.org/wordpress/wp-cont... https://www.niemanlab.org/wordpress/wp-content/themes/Labby/resources/niemansitelogos/lab-logo-color-tighter.svg — 200 — 1.9 KiB — 34 ms — h3https://www.niemanlab.org/images/300funston-scaled-1-480x345.jpgwww.niemanlab.org/images/300funston... https://www.niemanlab.org/images/300funston-scaled-1-480x345.jpg — 200 — 29.7 KiB — 63 ms — h3https://www.niemanlab.org/images/kalshi-art-1-480x304.jpgwww.niemanlab.org/images/kalshi-art... https://www.niemanlab.org/images/kalshi-art-1-480x304.jpg — 200 — 10.2 KiB — 52 ms — h3https://www.niemanlab.org/images/Pittsburgh2-480x320.jpgwww.niemanlab.org/images/Pittsburgh... https://www.niemanlab.org/images/Pittsburgh2-480x320.jpg — 200 — 20.2 KiB — 61 ms — h3https://www.niemanlab.org/images/twitter-traffic-480x249.jpgwww.niemanlab.org/images/twitter-tr... https://www.niemanlab.org/images/twitter-traffic-480x249.jpg — 200 — 9.2 KiB — 53 ms — h3https://www.niemanlab.org/images/alexander-grey-8a5eJ1-mmQ-unsplash-480x320.jpgwww.niemanlab.org/images/alexander-... https://www.niemanlab.org/images/alexander-grey-8a5eJ1-mmQ-unsplash-480x320.jpg — 200 — 17.7 KiB — 59 ms — h3https://www.niemanlab.org/images/50097850092_cdf4c54c3d_c-480x320.jpgwww.niemanlab.org/images/5009785009... https://www.niemanlab.org/images/50097850092_cdf4c54c3d_c-480x320.jpg — 200 — 49.2 KiB — 68 ms — h3https://www.niemanlab.org/images/ProPublica-strike-Susan-DeCarava-480x360.jpgwww.niemanlab.org/images/ProPublica... https://www.niemanlab.org/images/ProPublica-strike-Susan-DeCarava-480x360.jpg — 200 — 55.5 KiB — 73 ms — h3https://www.niemanlab.org/images/USAMap-480x354.jpgwww.niemanlab.org/images/USAMap-480... https://www.niemanlab.org/images/USAMap-480x354.jpg — 200 — 18.1 KiB — 52 ms — h3https://www.niemanlab.org/images/chain-link-fence-links-adobe-480x270.jpgwww.niemanlab.org/images/chain-link... https://www.niemanlab.org/images/chain-link-fence-links-adobe-480x270.jpg — 200 — 21.9 KiB — 61 ms — h3https://www.niemanlab.org/images/archives-adobe-480x318.jpgwww.niemanlab.org/images/archives-a... https://www.niemanlab.org/images/archives-adobe-480x318.jpg — 200 — 43.7 KiB — 63 ms — h3https://www.niemanlab.org/images/ICE-Minneapolis-optimized-1-480x320.jpgwww.niemanlab.org/images/ICE-Minnea... https://www.niemanlab.org/images/ICE-Minneapolis-optimized-1-480x320.jpg — 200 — 38.2 KiB — 64 ms — h3https://www.niemanlab.org/images/V-Spehar-480x320.pngwww.niemanlab.org/images/V-Spehar-4... https://www.niemanlab.org/images/V-Spehar-480x320.png — 200 — 149.0 KiB — 73 ms — h3https://www.niemanlab.org/images/LocalJournalismProjectCondo-480x322.jpgwww.niemanlab.org/images/LocalJourn... https://www.niemanlab.org/images/LocalJournalismProjectCondo-480x322.jpg — 200 — 50.0 KiB — 66 ms — h3https://www.niemanlab.org/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.jswww.niemanlab.org/cdn-cgi/scripts/7... https://www.niemanlab.org/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js — 200 — 4.2 KiB — 48 ms — h3https://www.niemanlab.org/wordpress/wp-content/themes/Labby/newfront-styles-print.csswww.niemanlab.org/wordpress/wp-cont... https://www.niemanlab.org/wordpress/wp-content/themes/Labby/newfront-styles-print.css — 200 — 1.1 KiB — 43 ms — h3https://www.niemanlab.org/images/kalshi-art-1-700x443.jpgwww.niemanlab.org/images/kalshi-art... 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h2https://fonts.googleapis.com/css?family=Open+Sans:300,400fonts.googleapis.com/css?family=Ope... https://fonts.googleapis.com/css?family=Open+Sans:300,400 — 200 — 1.7 KiB — 40 ms — h2data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIAAAAyCAYAAAAeP4ixAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJb…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIAAAAyCAYAAAAeP4ixAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJb… — 200 — 0 B — 0 ms — datahttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2fonts.gstatic.com/s/opensans/v44/me... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 200 — 42.0 KiB — 9 ms — h3https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff2fonts.gstatic.com/s/sourcesanspro/v... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff2 — 200 — 14.4 KiB — 8 ms — h3
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 421ms · 165KB · $6/mo
www.niemanlab.org
Other
Optional
Execution 137ms
Transfer 0 KB
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 111ms
Transfer 0 KB
Monthly Cost $1/mo
www.niemanlab.org
Other
Optional
Execution 108ms
Transfer 21 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 65ms
Transfer 144 KB
Unused 44%
Monthly Cost $1/mo

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

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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