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https://quantamagazine.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
54
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
86
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

3.43 s

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

7.89 s

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

548 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.

3.85 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.

12.76 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
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
19.5 MB transferred, 82 requests
FIX
19.5 MB transferred, 82 requests
Critical::
Page weighs 21.0 MB (19.5 MB transferred)
Warning::
Images are 5.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.6 MB
Info::
Fonts are 307 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 307 KB
Info::
82 HTTP requests
Info::
Estimated 4.1 g CO2 per page load
19.5 MB / 2.4 MB budget
19.5 MB transferred
82 requests
4.1 g CO2 per page load
Other 13.1 MiB 67%
Images 5.6 MiB 28%
JavaScript 488.4 KiB 2%
Fonts 307.2 KiB 2%
CSS 56.3 KiB 0%
HTML 44.7 KiB 0%
Other 11.4 KiB 0%
Other 3.7 KiB 0%
Other 858 B 0%
Other 260 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

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 (19.5 MiB of 19.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
3856ms total JS execution
FIX
3856ms total JS execution
Warning::
https://www.quantamagazine.org/: 1301ms CPU time
Warning::
Unattributable: 922ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-6SNE...: 358ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KZG...: 290ms CPU time
Warning::
https://scripts.clarity.ms/0.8.59/clarity.js: 286ms CPU time
Warning::
Third-party scripts: 3856ms (100% of total)

Main Thread Breakdown

Script Evaluation 41% Other 27% Style & Layout 16% Rendering 6% Script Parsing & Compilation 5% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.quantamagazine.org/1301ms52ms12ms3rd
Unattributable922ms29ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-6SNESLGK16&cx=c&gtm=4e64k0h1358ms278ms77ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KZGMXJ7290ms205ms49ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js286ms236ms10ms3rd
https://cdn-cookieyes.com/client_data/391b7abb1290e8e114fb4d75/script.js185ms165ms10ms3rd
https://www.quantamagazine.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1166ms129ms11ms3rd
https://cdn-cookieyes.com/client_data/391b7abb1290e8e114fb4d75/banner.js105ms79ms4ms3rd
https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/dist/main.min.js?ver=177558382697ms75ms18ms3rd
https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/js/mathjax/MathJax.js82ms69ms8ms3rd

Showing top 10 of 11 scripts

D
Page Weight Inventory
Action
82 resources · 19.5 MB · 164 KB savings available
FIX
82 resources · 19.5 MB · 164 KB savings available
Warning::
Page weight 18.5 MB over 1MB target
Got: 19.5 MB Expected: ≤ 1 MB
Info::
~164 KB of savings available
Warning::
81 third-party resources (100% of weight)
Info::
8 resources over 200KB
82 resources · 19.5 MiB · 81 third-party 18.5 MiB over 1MB target
Media 67% · 13.1 MiB
Image 28% · 5.6 MiB
JavaScript 2% · 488.4 KiB
Font 2% · 307.2 KiB
CSS 0% · 56.3 KiB
Document 0% · 45.6 KiB
Other 0% · 13.8 KiB

~163.6 KiB of savings available

Remove unused JavaScript: 163.6 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
Image Optimization
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Info::
All images are well-optimized
26 images 5.6 MB
0 oversized -0 KB
11 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
25 scripts, 164 KB unused
REVIEW
25 scripts, 164 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-6SNE...: 69 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KZG...: 62 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.quantamagazine.org/wp-content/themes/q...: 33 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 164 KB
164 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-6SNESLGK16&cx=c&gtm=4e64k0h1172 KB69 KB (40%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KZGMXJ7132 KB62 KB (47%)✓3rd
https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/dist/main.min.js?ver=177558382647 KB33 KB (70%)✓3rd
https://cdn-cookieyes.com/client_data/391b7abb1290e8e114fb4d75/banner.js8 KB—✓3rd
https://www.clarity.ms/tag/w4eo24j1xe?ref=gtm1 KB—✓3rd
https://www.quantamagazine.org/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.15 KB—✓3rd
https://www.quantamagazine.org/wp-content/plugins/quanta-education-interactive/jquery.validate.min.js?ver=6.6.27 KB—✓3rd
https://www.quantamagazine.org/wp-content/plugins/quanta-education-interactive/edin.js?ver=6.6.21 KB—✓3rd
https://www.quantamagazine.org/wp-content/plugins/sf-privacy-consent/js/front.min.js?ver=2.0.01 KB—✓3rd
https://www.quantamagazine.org/wp-content/plugins/disqus-comment-system/public/js/comment_embed.js?ver=3.1.11 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

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
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
7 fonts (307 KB)
PASS
7 fonts (307 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

307 KB total

Render-blocking

0

of 7

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 3.4 s LCP 7.9 shttps://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/fonts/pangram-bold-webfont.woff2pangram-bold-webfont.woff2 https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/fonts/pangram-bold-webfont.woff2 — 21.4 KiB — 16 ms — font-display: swaphttps://fonts.gstatic.com/s/merriweather/v33/u-4e0qyriQwlOrhSvowK_l5UcA6zuSYEqOzpPe3HOZJ5eX1WtLaQwmYiSeqqJ-mXq1Gi.woff2u-4e0qyriQwlOrhSvowK_l5... https://fonts.gstatic.com/s/merriweather/v33/u-4e0qyriQwlOrhSvowK_l5UcA6zuSYEqOzpPe3HOZJ5eX1WtLaQwmYiSeqqJ-mXq1Gi.woff2 — 95.4 KiB — 26 ms — font-display: swaphttps://fonts.gstatic.com/s/merriweather/v33/u-4c0qyriQwlOrhSvowK_l5-eTxCVx0ZbwLvKH2Gk9hLmp0v5yA-xXPqCzLvF-udrHOg7iA.woff2u-4c0qyriQwlOrhSvowK_l5... https://fonts.gstatic.com/s/merriweather/v33/u-4c0qyriQwlOrhSvowK_l5-eTxCVx0ZbwLvKH2Gk9hLmp0v5yA-xXPqCzLvF-udrHOg7iA.woff2 — 98.3 KiB — 21 ms — font-display: swaphttps://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/fonts/pangram-extrabold-webfont.woff2pangram-extrabold-webfo... https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/fonts/pangram-extrabold-webfont.woff2 — 21.3 KiB — 21 ms — font-display: swaphttps://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/fonts/pangram-regular-webfont.woff2pangram-regular-webfont... https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/fonts/pangram-regular-webfont.woff2 — 21.4 KiB — 18 ms — font-display: swaphttps://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/fonts/pangram-medium-webfont.woff2pangram-medium-webfont.... https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/fonts/pangram-medium-webfont.woff2 — 21.3 KiB — 23 ms — font-display: swaphttps://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/fonts/noe-display-bold.woff2noe-display-bold.woff2 https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/fonts/noe-display-bold.woff2 — 28.1 KiB — 12 ms — font-display: swap
pangram-bold-webfont.woff2 woff2 swap
Size 21 KB
Load time 16 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
u-4e0qyriQwlOrhSvowK_l5... woff2 swap
Size 95 KB
Load time 26 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
u-4c0qyriQwlOrhSvowK_l5... woff2 swap
Size 98 KB
Load time 21 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
pangram-extrabold-webfo... woff2 swap
Size 21 KB
Load time 21 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
pangram-regular-webfont... woff2 swap
Size 21 KB
Load time 18 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
pangram-medium-webfont.... woff2 swap
Size 21 KB
Load time 23 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
noe-display-bold.woff2 woff2 swap
Size 28 KB
Load time 12 ms
Start 1.1 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)
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+
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
Network Waterfall
82 requests over 4844ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 3.4 s LCP 7.9 shttps://quantamagazine.org// https://quantamagazine.org/ — 301 — 894 B — 374 ms — http/1.1https://www.quantamagazine.org/www.quantamagazine.org/ https://www.quantamagazine.org/ — 200 — 44.7 KiB — 46 ms — h2https://cdn-cookieyes.com/client_data/391b7abb1290e8e114fb4d75/script.jscdn-cookieyes.com/client_data/391b7... https://cdn-cookieyes.com/client_data/391b7abb1290e8e114fb4d75/script.js — 200 — 9.0 KiB — 23 ms — h2https://www.quantamagazine.org/wp-includes/css/dist/block-library/style.min.css?ver=6.6.2www.quantamagazine.org/wp-includes/... https://www.quantamagazine.org/wp-includes/css/dist/block-library/style.min.css?ver=6.6.2 — 200 — 14.7 KiB — 489 ms — h2https://www.quantamagazine.org/wp-content/plugins/sf-privacy-consent/css/front.min.css?ver=6.6.2www.quantamagazine.org/wp-content/p... https://www.quantamagazine.org/wp-content/plugins/sf-privacy-consent/css/front.min.css?ver=6.6.2 — 200 — 434 B — 400 ms — h2https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/css/fonts.csswww.quantamagazine.org/wp-content/t... https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/css/fonts.css — 200 — 489 B — 407 ms — h2https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/dist/main.min.css?ver=1775583826www.quantamagazine.org/wp-content/t... https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/dist/main.min.css?ver=1775583826 — 200 — 36.3 KiB — 539 ms — h2https://www.quantamagazine.org/wp-content/plugins/quanta-favorites/assets/css/favorites.css?ver=2.3.4www.quantamagazine.org/wp-content/p... https://www.quantamagazine.org/wp-content/plugins/quanta-favorites/assets/css/favorites.css?ver=2.3.4 — 200 — 3.2 KiB — 384 ms — h2https://www.quantamagazine.org/wp-content/uploads/2026/04/QR-Knots-cr-Dror-Bar-Natan_Roland-van-der-Veen_Quanta-Magazine-HP-768x325.webpwww.quantamagazine.org/wp-content/u... https://www.quantamagazine.org/wp-content/uploads/2026/04/QR-Knots-cr-Dror-Bar-Natan_Roland-van-der-Veen_Quanta-Magazine-HP-768x325.webp — 200 — 71.4 KiB — 620 ms — h2https://www.quantamagazine.org/wp-content/uploads/2026/04/FlagellarMotors-crKristinaArmitage-Default.jpgwww.quantamagazine.org/wp-content/u... https://www.quantamagazine.org/wp-content/uploads/2026/04/FlagellarMotors-crKristinaArmitage-Default.jpg — 200 — 136.3 KiB — 431 ms — h2https://www.quantamagazine.org/wp-content/uploads/2026/04/Quantum-Jamming-cr-Samuel-Velasco-Default.webpwww.quantamagazine.org/wp-content/u... https://www.quantamagazine.org/wp-content/uploads/2026/04/Quantum-Jamming-cr-Samuel-Velasco-Default.webp — 200 — 212.7 KiB — 381 ms — h2https://log.cookieyes.com/api/v1/loglog.cookieyes.com/api/v1/log https://log.cookieyes.com/api/v1/log — 200 — 260 B — 195 ms — h3blob:https://www.quantamagazine.org/e70387cd-af40-4e3b-9c63-fbc9298393a5www.quantamagazine.org/e70387cd-af4... blob:https://www.quantamagazine.org/e70387cd-af40-4e3b-9c63-fbc9298393a5 — 200 — -1 B — 36 ms — blobhttps://www.quantamagazine.org/wp-content/uploads/2026/04/Our-Bacterial-Immunity-cr-Maggie-Chiang-Default.webpwww.quantamagazine.org/wp-content/u... https://www.quantamagazine.org/wp-content/uploads/2026/04/Our-Bacterial-Immunity-cr-Maggie-Chiang-Default.webp — 200 — 235.0 KiB — 412 ms — h2https://fonts.googleapis.com/css?family=Merriweather:300,300i,400,400i,700,700ifonts.googleapis.com/css?family=Mer... https://fonts.googleapis.com/css?family=Merriweather:300,300i,400,400i,700,700i — 200 — 1.3 KiB — 124 ms — h2https://www.quantamagazine.org/wp-content/uploads/2026/04/Math-AI-Update-cr-Nash-Weerasekera-Default.webpwww.quantamagazine.org/wp-content/u... https://www.quantamagazine.org/wp-content/uploads/2026/04/Math-AI-Update-cr-Nash-Weerasekera-Default.webp — 200 — 167.4 KiB — 431 ms — h2https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/fonts/pangram-bold-webfont.woff2www.quantamagazine.org/wp-content/t... https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/fonts/pangram-bold-webfont.woff2 — 200 — 21.4 KiB — 16 ms — h2https://fonts.gstatic.com/s/merriweather/v33/u-4e0qyriQwlOrhSvowK_l5UcA6zuSYEqOzpPe3HOZJ5eX1WtLaQwmYiSeqqJ-mXq1Gi.woff2fonts.gstatic.com/s/merriweather/v3... https://fonts.gstatic.com/s/merriweather/v33/u-4e0qyriQwlOrhSvowK_l5UcA6zuSYEqOzpPe3HOZJ5eX1WtLaQwmYiSeqqJ-mXq1Gi.woff2 — 200 — 95.4 KiB — 26 ms — h3https://fonts.gstatic.com/s/merriweather/v33/u-4c0qyriQwlOrhSvowK_l5-eTxCVx0ZbwLvKH2Gk9hLmp0v5yA-xXPqCzLvF-udrHOg7iA.woff2fonts.gstatic.com/s/merriweather/v3... https://fonts.gstatic.com/s/merriweather/v33/u-4c0qyriQwlOrhSvowK_l5-eTxCVx0ZbwLvKH2Gk9hLmp0v5yA-xXPqCzLvF-udrHOg7iA.woff2 — 200 — 98.3 KiB — 21 ms — h3https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/fonts/pangram-extrabold-webfont.woff2www.quantamagazine.org/wp-content/t... https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/fonts/pangram-extrabold-webfont.woff2 — 200 — 21.3 KiB — 21 ms — h2https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/fonts/pangram-regular-webfont.woff2www.quantamagazine.org/wp-content/t... https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/fonts/pangram-regular-webfont.woff2 — 200 — 21.4 KiB — 18 ms — h2https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/fonts/pangram-medium-webfont.woff2www.quantamagazine.org/wp-content/t... https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/fonts/pangram-medium-webfont.woff2 — 200 — 21.3 KiB — 23 ms — h2https://www.quantamagazine.org/wp-content/plugins/disqus-comment-system/public/js/comment_count.js?ver=3.1.1www.quantamagazine.org/wp-content/p... https://www.quantamagazine.org/wp-content/plugins/disqus-comment-system/public/js/comment_count.js?ver=3.1.1 — 200 — 550 B — 413 ms — h2https://www.quantamagazine.org/wp-content/plugins/disqus-comment-system/public/js/comment_embed.js?ver=3.1.1www.quantamagazine.org/wp-content/p... https://www.quantamagazine.org/wp-content/plugins/disqus-comment-system/public/js/comment_embed.js?ver=3.1.1 — 200 — 847 B — 377 ms — h2https://www.quantamagazine.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1www.quantamagazine.org/wp-includes/... https://www.quantamagazine.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 29.8 KiB — 593 ms — h2https://www.quantamagazine.org/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1www.quantamagazine.org/wp-includes/... https://www.quantamagazine.org/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1 — 200 — 5.0 KiB — 403 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
100% of JavaScript execution is third-party
First-party Third-party 3856ms · 490KB · €42/mo
www.quantamagazine.org
Other
Costly
Execution 1301ms
Transfer 45 KB
Monthly Cost €14/mo
Unattributable
Other
Costly
Execution 922ms
Transfer 0 KB
Monthly Cost €10/mo
Google Tag Manager
Tag Manager
Costly
Execution 358ms
Transfer 172 KB
Unused 40%
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 290ms
Transfer 132 KB
Unused 47%
Monthly Cost €3/mo
Microsoft Clarity
Session Replay
Costly
Execution 286ms
Transfer 26 KB
Monthly Cost €3/mo
cdn-cookieyes.com
Other
Optional
Execution 185ms
Transfer 9 KB
Monthly Cost €2/mo
www.quantamagazine.org
Other
Optional
Execution 166ms
Transfer 30 KB
Monthly Cost €2/mo
cdn-cookieyes.com
Other
Optional
Execution 105ms
Transfer 8 KB
Monthly Cost €1/mo
www.quantamagazine.org
Other
Optional
Execution 97ms
Transfer 47 KB
Unused 70%
Monthly Cost €1/mo
www.quantamagazine.org
Other
Optional
Execution 82ms
Transfer 19 KB
Monthly Cost €1/mo
www.quantamagazine.org
Other
Optional
Execution 63ms
Transfer 2 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.quantamagazine.org adds 1301ms and costs ~€14/month
  • Unattributable adds 922ms and costs ~€10/month
  • Google Tag Manager adds 358ms and costs ~€4/month
  • Google Tag Manager adds 290ms and costs ~€3/month
  • Microsoft Clarity adds 286ms and costs ~€3/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

www.quantamagazine.org takes 1301ms 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 922ms 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

Google Tag Manager takes 358ms 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

Google Tag Manager takes 290ms 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

Microsoft Clarity takes 286ms 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

70% of www.quantamagazine.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

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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