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https://ams.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
51
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.
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.

1.54 s

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

4.41 s

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

5 ms

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

0.321

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

2.80 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.

4.42 s

Page Load Progression

541 ms
1.1 s
1.6 s
2.2 s
2.7 s
3.2 s
3.8 s
4.3 s
Checks
15
6 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
3.7 MB transferred, 94 requests
FIX
3.7 MB transferred, 94 requests
Warning::
Page weighs 7.7 MB (3.7 MB transferred)
Warning::
Images are 2.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.0 MB
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Info::
Fonts are 311 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 311 KB
Info::
94 HTTP requests
Info::
Estimated 0.78 g CO2 per page load
3.7 MB / 2.4 MB budget
3.7 MB transferred
94 requests
0.78 g CO2 per page load
Images 2.0 MiB 54%
JavaScript 1.2 MiB 31%
Fonts 311.0 KiB 8%
Other 95.6 KiB 2%
CSS 92.6 KiB 2%
HTML 30.7 KiB 1%
Other 19.0 KiB 0%
Other 10.3 KiB 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

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

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 (3.7 MiB of 3.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
28 scripts, 550 KB unused
FIX
28 scripts, 550 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-26G4...: 109 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PQJ...: 66 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-26G4...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-279...: 65 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-P37...: 64 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 550 KB
550 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-26G4XFTR63&cx=c&gtm=4e64k0160 KB109 KB (68%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PQJKQL138 KB66 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-26G4XFTR63160 KB65 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-2791151-1&cx=c&gtm=4e64k0115 KB65 KB (56%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P3772VN128 KB64 KB (50%)✓3rd
https://www.google.com/cse/static/element/b33cba5881f68fbf/cse_element__en.js?usqp=CAI%3D99 KB49 KB (49%)✓3rd
https://www.ams.org/js/MathJax/config/TeX-MML-AM_CHTML.js?V=2.7.577 KB41 KB (54%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB38 KB (67%)✓3rd
https://cse.google.com/adsense/search/async-ads.js44 KB32 KB (73%)✓3rd
https://code.jquery.com/jquery-3.6.0.min.js30 KB22 KB (72%)✓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

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

F
Page Weight Inventory
Action
94 resources · 3.7 MB · 550 KB savings available
FIX
94 resources · 3.7 MB · 550 KB savings available
Warning::
Page weight 2.7 MB over 1MB target
Got: 3.7 MB Expected: ≤ 1 MB
Info::
~550 KB of savings available
Warning::
93 third-party resources (100% of weight)
Info::
1 resources over 200KB
94 resources · 3.7 MiB · 93 third-party 2.7 MiB over 1MB target
Image 55% · 2.0 MiB
JavaScript 31% · 1.2 MiB
Font 8% · 311.0 KiB
CSS 5% · 186.5 KiB
Document 1% · 32.0 KiB
Other 0% · 12.9 KiB

~550.1 KiB of savings available

Remove unused JavaScript: 550.1 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.

C
Image Optimization
Action
15 images, 0 KB saveable
REVIEW
15 images, 0 KB saveable
Warning::
https://www.ams.org/images/2026-family-math-night-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ams.org/images/bull-cover.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ams.org/images/large-news-tile-2026-co... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ams.org/images/journals-cover-noti-gen... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ams.org/images/landing-members-chattin... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ams.org/images/AS-ams-logo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
15 images 2.0 MB
0 oversized -0 KB
14 legacy format
6 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

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

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
1080ms total JS execution
REVIEW
1080ms total JS execution
Warning::
https://www.ams.org/home/page: 317ms CPU time
Info::
Unattributable: 215ms CPU time
Info::
https://scripts.clarity.ms/0.8.59/clarity.js: 145ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-26G4...: 89ms CPU time
Info::
https://www.ams.org/cdn-cgi/challenge-platform/scr...: 79ms CPU time
Warning::
Third-party scripts: 1080ms (100% of total)

Main Thread Breakdown

Script Evaluation 52% Style & Layout 17% Other 16% Script Parsing & Compilation 9%
ScriptTotalScriptingParse/CompileParty
https://www.ams.org/home/page317ms20ms2ms3rd
Unattributable215ms7ms0ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js145ms125ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-26G4XFTR6389ms65ms17ms3rd
https://www.ams.org/cdn-cgi/challenge-platform/scripts/jsd/main.js79ms76ms1ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PQJKQL67ms53ms13ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P3772VN59ms46ms12ms3rd
https://www.ams.org/js/MathJax/config/TeX-MML-AM_CHTML.js?V=2.7.557ms47ms9ms3rd
https://kit.fontawesome.com/2ad6d7fbd6.js51ms49ms2ms3rd
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
9 fonts (311 KB)
PASS
9 fonts (311 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

311 KB total

Render-blocking

0

of 9

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 FCP 1.5 s LCP 4.4 shttps://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 — 20 ms — font-display: swaphttps://fonts.gstatic.com/s/dmsans/v17/rP2Yp2ywxg089UriI5-g4vlH9VoD8Cmcqbu0-K6z9mXg.woff2rP2Yp2ywxg089UriI5-g4vl... https://fonts.gstatic.com/s/dmsans/v17/rP2Yp2ywxg089UriI5-g4vlH9VoD8Cmcqbu0-K6z9mXg.woff2 — 36.1 KiB — 20 ms — font-display: swaphttps://fonts.gstatic.com/s/dmsans/v17/rP2Wp2ywxg089UriCZaSExd86J3t9jz86MvyyKy58UfivUw.woff2rP2Wp2ywxg089UriCZaSExd... https://fonts.gstatic.com/s/dmsans/v17/rP2Wp2ywxg089UriCZaSExd86J3t9jz86MvyyKy58UfivUw.woff2 — 38.9 KiB — 18 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-0.woff2pro-fa-brands-400-0.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-0.woff2 — 36.9 KiB — 21 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-0.woff2pro-fa-solid-900-0.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-0.woff2 — 11.8 KiB — 18 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-duotone-900-15.woff2pro-fa-duotone-900-15.w... https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-duotone-900-15.woff2 — 14.9 KiB — 27 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-14.woff2pro-fa-light-300-14.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-14.woff2 — 17.3 KiB — 32 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-12.woff2pro-fa-light-300-12.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-12.woff2 — 20.2 KiB — 23 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-1.woff2pro-fa-brands-400-1.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-1.woff2 — 39.5 KiB — 30 ms — font-display: swap
u-4e0qyriQwlOrhSvowK_l5... woff2 swap
Size 95 KB
Load time 20 ms
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
rP2Yp2ywxg089UriI5-g4vl... woff2 swap
Size 36 KB
Load time 20 ms
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
rP2Wp2ywxg089UriCZaSExd... woff2 swap
Size 39 KB
Load time 18 ms
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-0.woff2 woff2 swap
Size 37 KB
Load time 21 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
pro-fa-solid-900-0.woff2 woff2 swap
Size 12 KB
Load time 18 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
pro-fa-duotone-900-15.w... woff2 swap
Size 15 KB
Load time 27 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
pro-fa-light-300-14.woff2 woff2 swap
Size 17 KB
Load time 32 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
pro-fa-light-300-12.woff2 woff2 swap
Size 20 KB
Load time 23 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-1.woff2 woff2 swap
Size 40 KB
Load time 30 ms
Start 2.5 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+
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
94 requests over 4143ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.5 s LCP 4.4 shttps://ams.org// https://ams.org/ — 301 — 441 B — 204 ms — h2https://www.ams.org//www.ams.org// https://www.ams.org// — 302 — 85 B — 196 ms — h2https://www.ams.org/home/pagewww.ams.org/home/page https://www.ams.org/home/page — 200 — 24.9 KiB — 103 ms — h2https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.csscdn.jsdelivr.net/npm/bootstrap@5.3.... https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css — 200 — 32.8 KiB — 43 ms — h2https://cdnjs.cloudflare.com/ajax/libs/bootstrap-icons/1.10.3/font/bootstrap-icons.min.csscdnjs.cloudflare.com/ajax/libs/boot... https://cdnjs.cloudflare.com/ajax/libs/bootstrap-icons/1.10.3/font/bootstrap-icons.min.css — 200 — 10.3 KiB — 26 ms — h3https://fonts.googleapis.com/css2?family=Merriweather:ital,wght@0,300;0,400;0,700;0,900;1,300;1,400;1,700;1,900&display=swapfonts.googleapis.com/css2?family=Me... https://fonts.googleapis.com/css2?family=Merriweather:ital,wght@0,300;0,400;0,700;0,900;1,300;1,400;1,700;1,900&display=swap — 200 — 1.3 KiB — 46 ms — h2https://fonts.googleapis.com/css2?family=Bodoni+Moda:ital,wght@0,400;0,500;0,700;1,400;1,500&family=DM+Sans:ital,wght@0,400;0,500;0,700;1,400;1,500&family=Inter:wght@200;400;500;600;700&display=swapfonts.googleapis.com/css2?family=Bo... https://fonts.googleapis.com/css2?family=Bodoni+Moda:ital,wght@0,400;0,500;0,700;1,400;1,500&family=DM+Sans:ital,wght@0,400;0,500;0,700;1,400;1,500&family=Inter:wght@200;400;500;600;700&display=swap — 200 — 2.3 KiB — 47 ms — h2https://code.jquery.com/jquery-3.6.0.min.jscode.jquery.com/jquery-3.6.0.min.js https://code.jquery.com/jquery-3.6.0.min.js — 200 — 30.5 KiB — 40 ms — h2https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.jscdn.jsdelivr.net/npm/bootstrap@5.3.... https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js — 200 — 23.8 KiB — 41 ms — h2https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.csscdn.jsdelivr.net/npm/bootstrap@5.1.... https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css — 200 — 25.4 KiB — 35 ms — h2https://www.ams.org/css/2024BS5Final.csswww.ams.org/css/2024BS5Final.css https://www.ams.org/css/2024BS5Final.css — 200 — 2.7 KiB — 519 ms — h2https://www.ams.org/css/www-nav.csswww.ams.org/css/www-nav.css https://www.ams.org/css/www-nav.css — 200 — 2.6 KiB — 340 ms — h2https://www.ams.org/js/MathJax/MathJax.js?config=TeX-MML-AM_CHTMLwww.ams.org/js/MathJax/MathJax.js?c... https://www.ams.org/js/MathJax/MathJax.js?config=TeX-MML-AM_CHTML — 200 — 18.9 KiB — 1.7 s — h2https://www.ams.org/css/cookieconsent.min.csswww.ams.org/css/cookieconsent.min.c... https://www.ams.org/css/cookieconsent.min.css — 200 — 1.3 KiB — 468 ms — h2https://www.ams.org/js/cookieconsent.min.jswww.ams.org/js/cookieconsent.min.js https://www.ams.org/js/cookieconsent.min.js — 200 — 6.5 KiB — 500 ms — h2https://www.ams.org/css/www-homepage.csswww.ams.org/css/www-homepage.css https://www.ams.org/css/www-homepage.css — 200 — 2.7 KiB — 254 ms — h2https://www.ams.org/js/www-nav.jswww.ams.org/js/www-nav.js https://www.ams.org/js/www-nav.js — 200 — 1.4 KiB — 560 ms — h2https://www.ams.org/js/alert.jswww.ams.org/js/alert.js https://www.ams.org/js/alert.js — 200 — 1.2 KiB — 60 ms — h2https://www.ams.org/css/alert.csswww.ams.org/css/alert.css https://www.ams.org/css/alert.css — 200 — 333 B — 657 ms — h2https://www.ams.org/images/landing-members-chatting.jpgwww.ams.org/images/landing-members-... https://www.ams.org/images/landing-members-chatting.jpg — 200 — 140.0 KiB — 1.7 s — h2https://www.ams.org/js/rssreader.jswww.ams.org/js/rssreader.js https://www.ams.org/js/rssreader.js — 200 — 987 B — 131 ms — h2https://www.ams.org/journals/notices/202605/feature-p359.jpgwww.ams.org/journals/notices/202605... https://www.ams.org/journals/notices/202605/feature-p359.jpg — 200 — 78.7 KiB — 1.0 s — 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h3https://www.google-analytics.com/j/collect?v=1&_v=j102&a=530271731&t=pageview&_s=1&dl=https%3A%2F%2Fwww.ams.org%2Fhome%2Fpage&dh=www.ams.org&ul=en-us&dt=American%20Mathematical%20Society%20%3A%3A%20Homepage&sr=800x600&vp=1350x940&_u=aGBAiEIhBAAAACAAI~&jid=1438839920&gjid=1176120095&cid=124066594.1776889916&tid=UA-2791151-1&_gid=1060054817.1776889916&_slc=1&z=533345403www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=530271731&t=pageview&_s=1&dl=https%3A%2F%2Fwww.ams.org%2Fhome%2Fpage&dh=www.ams.org&ul=en-us&dt=American%20Mathematical%20Society%20%3A%3A%20Homepage&sr=800x600&vp=1350x940&_u=aGBAiEIhBAAAACAAI~&jid=1438839920&gjid=1176120095&cid=124066594.1776889916&tid=UA-2791151-1&_gid=1060054817.1776889916&_slc=1&z=533345403 — 200 — 26 B — 18 ms — h3https://stats.g.doubleclick.net/j/collect?t=dc&aip=1&_r=3&v=1&_v=j102&tid=UA-2791151-1&cid=124066594.1776889916&jid=1438839920&gjid=1176120095&_gid=1060054817.1776889916&_u=aGBAiEIhBAAAAGAAI~&z=1519917364stats.g.doubleclick.net/j/collect?t... https://stats.g.doubleclick.net/j/collect?t=dc&aip=1&_r=3&v=1&_v=j102&tid=UA-2791151-1&cid=124066594.1776889916&jid=1438839920&gjid=1176120095&_gid=1060054817.1776889916&_u=aGBAiEIhBAAAAGAAI~&z=1519917364 — 200 — 647 B — 49 ms — h2https://cse.google.com/adsense/search/async-ads.jscse.google.com/adsense/search/async... https://cse.google.com/adsense/search/async-ads.js — 200 — 43.6 KiB — 33 ms — h2data:image/svg+xml;utf8,<svg width='24' height='24' viewBox='0 0 24 24' fill='none' xmlns='http://w…w… data:image/svg+xml;utf8,<svg width='24' height='24' viewBox='0 0 24 24' fill='none' xmlns='http://w… — 200 — 0 B — 0 ms — datahttps://www.google.com/cse/static/css/v2/clear.pngwww.google.com/cse/static/css/v2/cl... https://www.google.com/cse/static/css/v2/clear.png — 200 — 1.0 KiB — 10 ms — h3https://www.google.com/cse/static/images/1x/en/branding.pngwww.google.com/cse/static/images/1x... https://www.google.com/cse/static/images/1x/en/branding.png — 200 — 1.5 KiB — 11 ms — h3https://clients1.google.com/generate_204clients1.google.com/generate_204 https://clients1.google.com/generate_204 — 204 — 117 B — 24 ms — h2https://c.clarity.ms/c.gifc.clarity.ms/c.gif https://c.clarity.ms/c.gif — 302 — 516 B — 93 ms — h2https://ep1.adtrafficquality.google/getconfig/sodar?sv=200&tid=afs&tv=1234567890&st=env&sjk=XTHaUGwWSM+0Uao3m/11+Q==&sde=1ep1.adtrafficquality.google/getconf... https://ep1.adtrafficquality.google/getconfig/sodar?sv=200&tid=afs&tv=1234567890&st=env&sjk=XTHaUGwWSM+0Uao3m/11+Q==&sde=1 — 200 — 8.0 KiB — 55 ms — h3https://www.ams.org/cdn-cgi/rum?www.ams.org/cdn-cgi/rum? https://www.ams.org/cdn-cgi/rum? — 204 — 169 B — 7 ms — h2https://www.ams.org/images/Logo-Favicon.pngwww.ams.org/images/Logo-Favicon.png https://www.ams.org/images/Logo-Favicon.png — 200 — 16.9 KiB — 69 ms — h2https://e.clarity.ms/collecte.clarity.ms/collect https://e.clarity.ms/collect — 204 — 275 B — 73 ms — http/1.1https://ep2.adtrafficquality.google/sodar/sodar2.jsep2.adtrafficquality.google/sodar/s... https://ep2.adtrafficquality.google/sodar/sodar2.js — 200 — 7.9 KiB — 36 ms — h2https://c.bing.com/c.gif?ctsa=mr&CtsSyncId=FD8058BD5C9E4F70AB8A1FCE77963FA9&RedC=c.clarity.ms&MXFR=1629886E16406D4D2B2C9F2D124063BEc.bing.com/c.gif?ctsa=mr&CtsSyncId=... https://c.bing.com/c.gif?ctsa=mr&CtsSyncId=FD8058BD5C9E4F70AB8A1FCE77963FA9&RedC=c.clarity.ms&MXFR=1629886E16406D4D2B2C9F2D124063BE — 302 — 763 B — 91 ms — h2https://www.ams.org/images/Logo-Favicon.pngwww.ams.org/images/Logo-Favicon.png https://www.ams.org/images/Logo-Favicon.png — 200 — 0 B — 6 ms — h2https://ep2.adtrafficquality.google/sodar/sodar2/254/runner.htmlep2.adtrafficquality.google/sodar/s... https://ep2.adtrafficquality.google/sodar/sodar2/254/runner.html — 200 — 5.8 KiB — 23 ms — h2https://www.ams.org/images/Logo-Favicon.pngwww.ams.org/images/Logo-Favicon.png https://www.ams.org/images/Logo-Favicon.png — 200 — 0 B — 6 ms — h2https://c.clarity.ms/c.gif?ctsa=mr&CtsSyncId=FD8058BD5C9E4F70AB8A1FCE77963FA9&MUID=2815B0F629D765AE28E3A7B528946425c.clarity.ms/c.gif?ctsa=mr&CtsSyncI... https://c.clarity.ms/c.gif?ctsa=mr&CtsSyncId=FD8058BD5C9E4F70AB8A1FCE77963FA9&MUID=2815B0F629D765AE28E3A7B528946425 — 200 — 466 B — 202 ms — h2https://pagead2.googlesyndication.com/bg/6u4cjZJ6xo3e9mwcSLvMY6cXkaRwmTskeynnxfNWQwA.jspagead2.googlesyndication.com/bg/6u... https://pagead2.googlesyndication.com/bg/6u4cjZJ6xo3e9mwcSLvMY6cXkaRwmTskeynnxfNWQwA.js — 200 — 21.9 KiB — 24 ms — h3https://ep2.adtrafficquality.google/generate_204?QxVaywep2.adtrafficquality.google/generat... https://ep2.adtrafficquality.google/generate_204?QxVayw — 204 — 40 B — 6 ms — h2https://e.clarity.ms/collecte.clarity.ms/collect https://e.clarity.ms/collect — 204 — 275 B — 101 ms — http/1.1https://ep1.adtrafficquality.google/pagead/sodar?id=sodar2&v=254&t=2&li=afs_1234567890&jk=XTHaUGwWSM%2B0Uao3m%2F11%2BQ%3D%3D&bg=!dHeldxXNAAa1ilLUlYo7AEcBe5WfOKE5F8KCU5PzIadYhdio2JdMUXoNgOfhK3qHPMlZQWToDVUJg-s9TFJhDOAM3KHySuDRk35ne4xEXfEyuUnCYF-AUgIAAABnUgAAAARoAQd-ABvKRkZjMJUwJqRq8j9Sp2TiMyTrjOGmUy-2QfsKAJ_pqJTNsb_mRFAo0zUZgzhUftoKDte_Sj_lIxQDDTSi0741_HdkdjXLKSut6vgsHHBtq8apAqZyQYUbHzqOCRGDvHMWpzv9JcxUrkKojvJCS1sRj7EVgTjmRWu6m29cZhjBqsHyCOTykB6k8RZV_dT8uYmWzlkkWD7dS9mv1GxYPl1UldltaaDudoBiYp9WEkOPI7JMcvMrB3BTzPH7gfSZAflH0bvmeRZ48C_LoeX_ip1oD8xzQE5-SIXTuOXMWwkwpq_Y9avpkpVEoBc1Jpi1qieuJxfD9nJlyrasGYCnilGAq-PTIqTzjyyCzmsWqo0tHEfDWCjurefGf-ciwesUmh2NmaZYpoi1NhRbSiv3x4m1QTIBa3lrzR2tnPGmbZt01A81V8LKJoODZ5s96KYHWAWT3MuWTua-bj3ESkesSjBy0OQdDsw9yTn0H7gjsQ7Bnn04s8m8WrsqkCs_Rdx4OnDgHbsCC5requzj3shgfs-WM7m5EDDMKeqhKVsch5pp_Vf-jgtJs0C3iaPZdpMR7vVuMF-NZCe3zrZbDzDrBUxFzwIC5qKxiZnVou_MvThvv2pGF7TX_c1tNuJaP3guEZP98k6oSdzoFBamf0kivRU427WnmN6j6-Fbz1m4h62bancS3XCdupyiZUMf2LZWbIFkVLB1Xmp7nR7xjx7Ho0gUx_FuZQa542ORGibS8e_ma9nqr9IdhBDQ28QtQPasEMT6YRaDa7BJGQhO7dFMY9QXjplXDi4toEouOpmpFgs3B3Td8pnKiHHThxBhifxbDP5grXb7UxEdYujMdIzokDY21jdAzcjVb-nK7BCo8IAYaZSZq0yictj4YCK7U_2bgcrDDpoQekmwc38iN-I4Mr49qRyJqECeVZC2ep1.adtrafficquality.google/pagead/... https://ep1.adtrafficquality.google/pagead/sodar?id=sodar2&v=254&t=2&li=afs_1234567890&jk=XTHaUGwWSM%2B0Uao3m%2F11%2BQ%3D%3D&bg=!dHeldxXNAAa1ilLUlYo7AEcBe5WfOKE5F8KCU5PzIadYhdio2JdMUXoNgOfhK3qHPMlZQWToDVUJg-s9TFJhDOAM3KHySuDRk35ne4xEXfEyuUnCYF-AUgIAAABnUgAAAARoAQd-ABvKRkZjMJUwJqRq8j9Sp2TiMyTrjOGmUy-2QfsKAJ_pqJTNsb_mRFAo0zUZgzhUftoKDte_Sj_lIxQDDTSi0741_HdkdjXLKSut6vgsHHBtq8apAqZyQYUbHzqOCRGDvHMWpzv9JcxUrkKojvJCS1sRj7EVgTjmRWu6m29cZhjBqsHyCOTykB6k8RZV_dT8uYmWzlkkWD7dS9mv1GxYPl1UldltaaDudoBiYp9WEkOPI7JMcvMrB3BTzPH7gfSZAflH0bvmeRZ48C_LoeX_ip1oD8xzQE5-SIXTuOXMWwkwpq_Y9avpkpVEoBc1Jpi1qieuJxfD9nJlyrasGYCnilGAq-PTIqTzjyyCzmsWqo0tHEfDWCjurefGf-ciwesUmh2NmaZYpoi1NhRbSiv3x4m1QTIBa3lrzR2tnPGmbZt01A81V8LKJoODZ5s96KYHWAWT3MuWTua-bj3ESkesSjBy0OQdDsw9yTn0H7gjsQ7Bnn04s8m8WrsqkCs_Rdx4OnDgHbsCC5requzj3shgfs-WM7m5EDDMKeqhKVsch5pp_Vf-jgtJs0C3iaPZdpMR7vVuMF-NZCe3zrZbDzDrBUxFzwIC5qKxiZnVou_MvThvv2pGF7TX_c1tNuJaP3guEZP98k6oSdzoFBamf0kivRU427WnmN6j6-Fbz1m4h62bancS3XCdupyiZUMf2LZWbIFkVLB1Xmp7nR7xjx7Ho0gUx_FuZQa542ORGibS8e_ma9nqr9IdhBDQ28QtQPasEMT6YRaDa7BJGQhO7dFMY9QXjplXDi4toEouOpmpFgs3B3Td8pnKiHHThxBhifxbDP5grXb7UxEdYujMdIzokDY21jdAzcjVb-nK7BCo8IAYaZSZq0yictj4YCK7U_2bgcrDDpoQekmwc38iN-I4Mr49qRyJqECeVZC2 — 204 — 17 B — 33 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 1080ms · 559KB · €6/mo
www.ams.org
Other
Costly
Execution 317ms
Transfer 25 KB
Monthly Cost €2/mo
Unattributable
Other
Costly
Execution 215ms
Transfer 0 KB
Monthly Cost €1/mo
Microsoft Clarity
Session Replay
Optional
Execution 145ms
Transfer 26 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 89ms
Transfer 160 KB
Unused 41%
Monthly Cost €0/mo
www.ams.org
Other
Optional
Execution 79ms
Transfer 0 KB
Monthly Cost €0/mo
Google Tag Manager
Tag Manager
Optional
Execution 67ms
Transfer 138 KB
Unused 48%
Monthly Cost €0/mo
Google Tag Manager
Tag Manager
Optional
Execution 59ms
Transfer 128 KB
Unused 50%
Monthly Cost €0/mo
www.ams.org
Other
Optional
Execution 57ms
Transfer 77 KB
Unused 54%
Monthly Cost €0/mo
kit.fontawesome.com
Other
Optional
Execution 51ms
Transfer 6 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • www.ams.org adds 317ms and costs ~€2/month
  • Unattributable adds 215ms and costs ~€1/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.ams.org takes 317ms 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 215ms 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

50% of Google Tag Manager'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

54% of www.ams.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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