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https://quantamagazine.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
82
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
83
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.

1.46 s

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

2.34 s

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

16 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.

1.46 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.

2.44 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
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
9.1 MB transferred, 81 requests
FIX
9.1 MB transferred, 81 requests
Critical::
Page weighs 11.3 MB (9.1 MB transferred)
Warning::
Images are 5.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.8 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::
81 HTTP requests
Info::
Estimated 1.9 g CO2 per page load
9.1 MB / 2.4 MB budget
9.1 MB transferred
81 requests
1.9 g CO2 per page load
Images 5.8 MiB 64%
Other 2.4 MiB 26%
JavaScript 488.2 KiB 5%
Fonts 307.4 KiB 3%
CSS 56.2 KiB 1%
HTML 44.7 KiB 0%
Other 11.4 KiB 0%
Other 3.7 KiB 0%
Other 572 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 (9.1 MiB of 9.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
81 resources · 9.1 MB · 164 KB savings available
FIX
81 resources · 9.1 MB · 164 KB savings available
Warning::
Page weight 8.1 MB over 1MB target
Got: 9.1 MB Expected: ≤ 1 MB
Info::
~164 KB of savings available
Warning::
80 third-party resources (100% of weight)
Info::
9 resources over 200KB
81 resources · 9.1 MiB · 80 third-party 8.1 MiB over 1MB target
Image 64% · 5.8 MiB
Media 26% · 2.4 MiB
JavaScript 5% · 488.2 KiB
Font 3% · 307.4 KiB
CSS 1% · 56.2 KiB
Document 0% · 45.5 KiB
Other 0% · 13.5 KiB

~164.0 KiB of savings available

Remove unused JavaScript: 164.0 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
27 images, 0 KB saveable
REVIEW
27 images, 0 KB saveable
Info::
All images are well-optimized
27 images 5.8 MB
0 oversized -0 KB
11 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
716ms total JS execution
REVIEW
716ms total JS execution
Warning::
https://www.quantamagazine.org/: 264ms CPU time
Info::
Unattributable: 166ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-6SNE...: 84ms CPU time
Info::
https://scripts.clarity.ms/0.8.59/clarity.js: 77ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-KZG...: 74ms CPU time
Warning::
Third-party scripts: 716ms (100% of total)

Main Thread Breakdown

Script Evaluation 47% Other 21% Style & Layout 19% Script Parsing & Compilation 6% Parse HTML & CSS 4% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.quantamagazine.org/264ms7ms3ms3rd
Unattributable166ms5ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-6SNESLGK16&cx=c&gtm=4e64k084ms66ms17ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js77ms67ms3ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KZGMXJ774ms61ms13ms3rd
https://cdn-cookieyes.com/client_data/391b7abb1290e8e114fb4d75/script.js51ms47ms3ms3rd
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=4e64k0172 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://quanta-mag.disqus.com/count.js2 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 500 ms 1.0 s 1.5 s 2.0 s FCP 1.5 s LCP 2.3 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 — 38 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 — 24 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 — 26 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 — 21.5 KiB — 37 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 — 21.5 KiB — 36 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 — 36 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 — 34 ms — font-display: swap
pangram-bold-webfont.woff2 woff2 swap
Size 21 KB
Load time 38 ms
Start 692 ms
Risk FOUT — text flashes from fallback to web font
u-4e0qyriQwlOrhSvowK_l5... woff2 swap
Size 95 KB
Load time 24 ms
Start 692 ms
Risk FOUT — text flashes from fallback to web font
u-4c0qyriQwlOrhSvowK_l5... woff2 swap
Size 98 KB
Load time 26 ms
Start 693 ms
Risk FOUT — text flashes from fallback to web font
pangram-extrabold-webfo... woff2 swap
Size 21 KB
Load time 37 ms
Start 693 ms
Risk FOUT — text flashes from fallback to web font
pangram-regular-webfont... woff2 swap
Size 21 KB
Load time 36 ms
Start 694 ms
Risk FOUT — text flashes from fallback to web font
pangram-medium-webfont.... woff2 swap
Size 21 KB
Load time 36 ms
Start 694 ms
Risk FOUT — text flashes from fallback to web font
noe-display-bold.woff2 woff2 swap
Size 28 KB
Load time 34 ms
Start 815 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
81 requests over 3321ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.5 s LCP 2.3 shttps://quantamagazine.org// https://quantamagazine.org/ — 301 — 894 B — 369 ms — http/1.1https://www.quantamagazine.org/www.quantamagazine.org/ https://www.quantamagazine.org/ — 200 — 44.7 KiB — 44 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 — 46 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 — 14.6 KiB — 17 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 — 435 B — 15 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 — 490 B — 29 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 — 24 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 — 19 ms — h2https://www.quantamagazine.org/wp-content/uploads/2026/04/QR-Knots-cr-Dror-Bar-Natan_Roland-van-der-Veen_Quanta-Magazine-HP-1536x650.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-1536x650.webp — 200 — 163.9 KiB — 32 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 — 30 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 — 35 ms — h2https://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 — 19 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 — 167.5 KiB — 21 ms — h2https://log.cookieyes.com/api/v1/loglog.cookieyes.com/api/v1/log https://log.cookieyes.com/api/v1/log — 200 — 260 B — 201 ms — h3https://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 — 566 B — 12 ms — h2blob:https://www.quantamagazine.org/d9ffb480-a1fa-4619-b37d-7eea984db04awww.quantamagazine.org/d9ffb480-a1f... blob:https://www.quantamagazine.org/d9ffb480-a1fa-4619-b37d-7eea984db04a — 200 — -1 B — 42 ms — blobhttps://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 — 130 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 — 1.0 KiB — 12 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 — 15 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 — 4.9 KiB — 11 ms — h2https://www.quantamagazine.org/wp-content/plugins/quanta-education-interactive/jquery.validate.min.js?ver=6.6.2www.quantamagazine.org/wp-content/p... https://www.quantamagazine.org/wp-content/plugins/quanta-education-interactive/jquery.validate.min.js?ver=6.6.2 — 200 — 7.4 KiB — 13 ms — h2https://www.quantamagazine.org/wp-content/plugins/quanta-education-interactive/edin.js?ver=6.6.2www.quantamagazine.org/wp-content/p... https://www.quantamagazine.org/wp-content/plugins/quanta-education-interactive/edin.js?ver=6.6.2 — 200 — 684 B — 11 ms — h2https://www.quantamagazine.org/wp-content/plugins/sf-privacy-consent/js/front.min.js?ver=2.0.0www.quantamagazine.org/wp-content/p... https://www.quantamagazine.org/wp-content/plugins/sf-privacy-consent/js/front.min.js?ver=2.0.0 — 200 — 1.2 KiB — 12 ms — h2https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/dist/main.min.js?ver=1775583826www.quantamagazine.org/wp-content/t... https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/dist/main.min.js?ver=1775583826 — 200 — 47.3 KiB — 15 ms — h2https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/js/mathjax/MathJax.jswww.quantamagazine.org/wp-content/t... https://www.quantamagazine.org/wp-content/themes/quanta2024/frontend/js/mathjax/MathJax.js — 200 — 18.7 KiB — 14 ms — h2https://www.quantamagazine.org/wp-content/plugins/quanta-favorites/assets/js/favorites.min.js?ver=2.3.4www.quantamagazine.org/wp-content/p... https://www.quantamagazine.org/wp-content/plugins/quanta-favorites/assets/js/favorites.min.js?ver=2.3.4 — 200 — 4.1 KiB — 13 ms — h2https://www.quantamagazine.org/wp-content/uploads/2026/02/SixMathEssentials-Ad-HP.jpgwww.quantamagazine.org/wp-content/u... https://www.quantamagazine.org/wp-content/uploads/2026/02/SixMathEssentials-Ad-HP.jpg — 200 — 282.1 KiB — 20 ms — h2https://www.quantamagazine.org/wp-content/uploads/2026/02/SixMathEssentials-Ad-Mobile.jpgwww.quantamagazine.org/wp-content/u... https://www.quantamagazine.org/wp-content/uploads/2026/02/SixMathEssentials-Ad-Mobile.jpg — 200 — 52.8 KiB — 14 ms — h2https://www.quantamagazine.org/wp-content/uploads/2026/02/SixMathEssentials-Ad-Newsletter-1536x431.jpgwww.quantamagazine.org/wp-content/u... https://www.quantamagazine.org/wp-content/uploads/2026/02/SixMathEssentials-Ad-Newsletter-1536x431.jpg — 200 — 82.3 KiB — 17 ms — h2https://www.quantamagazine.org/wp-content/uploads/2026/03/Math-Series-Hub-Lede-Animated-still.webpwww.quantamagazine.org/wp-content/u... https://www.quantamagazine.org/wp-content/uploads/2026/03/Math-Series-Hub-Lede-Animated-still.webp — 200 — 3.1 MiB — 230 ms — h2
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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 716ms · 384KB · €8/mo
www.quantamagazine.org
Other
Costly
Execution 264ms
Transfer 45 KB
Monthly Cost €3/mo
Unattributable
Other
Optional
Execution 166ms
Transfer 0 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 84ms
Transfer 172 KB
Unused 40%
Monthly Cost €1/mo
Microsoft Clarity
Session Replay
Optional
Execution 77ms
Transfer 26 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 74ms
Transfer 132 KB
Unused 47%
Monthly Cost €1/mo
cdn-cookieyes.com
Other
Optional
Execution 51ms
Transfer 9 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.quantamagazine.org adds 264ms 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 264ms 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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