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https://rsna.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
80
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
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.
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.

1.22 s

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

2.81 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.

1.60 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.

2.81 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
4.9 MB transferred, 84 requests
FIX
4.9 MB transferred, 84 requests
Critical::
Page weighs 6.2 MB (4.9 MB transferred)
Warning::
Images are 4.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.2 MB
Info::
Fonts are 271 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 271 KB
Info::
84 HTTP requests
Info::
Estimated 1.0 g CO2 per page load
4.9 MB / 2.4 MB budget
4.9 MB transferred
84 requests
1.0 g CO2 per page load
Images 4.2 MiB 85%
JavaScript 343.1 KiB 7%
Fonts 271.1 KiB 5%
CSS 73.6 KiB 1%
Other 56.4 KiB 1%
HTML 25.8 KiB 1%
Other 7.8 KiB 0%
Other 0 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 (4.9 MiB of 4.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
84 resources · 4.9 MB · 94 KB savings available
FIX
84 resources · 4.9 MB · 94 KB savings available
Warning::
Page weight 3.9 MB over 1MB target
Got: 4.9 MB Expected: ≤ 1 MB
Info::
~94 KB of savings available
Warning::
83 third-party resources (100% of weight)
Info::
13 resources over 200KB
84 resources · 4.9 MiB · 83 third-party 3.9 MiB over 1MB target
Image 86% · 4.2 MiB
JavaScript 7% · 343.1 KiB
Font 5% · 271.1 KiB
CSS 1% · 73.6 KiB
Document 1% · 25.9 KiB
Other 0% · 7.7 KiB

~93.9 KiB of savings available

Remove unused JavaScript: 93.9 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.

C
Image Optimization
Action
44 images, 0 KB saveable
REVIEW
44 images, 0 KB saveable
Warning::
https://www.rsna.org/-/media/Images/RSNA/sandbox/h... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.rsna.org/-/media/Images/RSNA/sandbox/h... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.rsna.org/-/media/images/rsna/menu/logo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.rsna.org/-/media/Images/RSNA/sandbox/h... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.rsna.org/images/rsna/home/line_icon_gr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.rsna.org/images/rsna/home/line_icon_he... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.rsna.org/-/media/Images/RSNA/sandbox/h... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.rsna.org/-/media/images/rsna/menu/logo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.rsna.org/images/rsna/home/line_Icon_pe... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
44 images 4.2 MB
0 oversized -0 KB
43 legacy format
9 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

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

B
JS Execution Cost
663ms total JS execution
REVIEW
663ms total JS execution
Info::
Unattributable: 233ms CPU time
Info::
https://www.rsna.org/: 199ms CPU time
Info::
https://cdnjs.cloudflare.com/ajax/libs/gsap/2.0.1/...: 177ms CPU time
Info::
https://web.cmp.usercentrics.eu/ui/v/3.117.0/WebSd...: 54ms CPU time
Warning::
Third-party scripts: 663ms (100% of total)

Main Thread Breakdown

Other 39% Script Evaluation 26% Style & Layout 22% Rendering 6% Script Parsing & Compilation 5% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
Unattributable233ms7ms0ms3rd
https://www.rsna.org/199ms2ms1ms3rd
https://cdnjs.cloudflare.com/ajax/libs/gsap/2.0.1/TweenMax.min.js177ms54ms3ms3rd
https://web.cmp.usercentrics.eu/ui/v/3.117.0/WebSdk.lib.4c6726a9.js54ms40ms8ms3rd
C
JS Bundles
Action
21 scripts, 94 KB unused
REVIEW
21 scripts, 94 KB unused
Warning::
https://www.rsna.org/scripts/rsna/home/app.bundle....: 59 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.rsna.org/scripts/rsna/home/app.bundle....: unminified — 39 KB could be saved
Warning::
https://web.cmp.usercentrics.eu/ui/v/3.117.0/WebSd...: 35 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic...: unminified — 3 KB could be saved
Info::
Total unused JavaScript: 94 KB
94 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.rsna.org/scripts/rsna/home/app.bundle.js82 KB59 KB (71%)✗3rd
https://web.cmp.usercentrics.eu/ui/v/3.117.0/WebSdk.lib.4c6726a9.js56 KB35 KB (63%)✓3rd
https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.5/plugins/debug.addIndicators.js6 KB—✗3rd
https://www.rsna.org/bundles/rsna.js?v=3N6AO2JV_dC_QBdjE78xkG5kw3aAsc6NpO6y3kHwEEw19 KB—✓3rd
https://code.jquery.com/jquery-migrate-3.0.0.min.js3 KB—✓3rd
https://bfintal.github.io/Counter-Up/jquery.counterup.min.js1 KB—✓3rd
https://cdnjs.cloudflare.com/ajax/libs/waypoints/2.0.3/waypoints.min.js3 KB—✓3rd
https://cdnjs.cloudflare.com/ajax/libs/gsap/2.0.1/TweenMax.min.js34 KB—✓3rd
https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.5/ScrollMagic.min.js6 KB—✓3rd
https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.5/plugins/animation.gsap.js4 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

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
2 fonts (271 KB)
PASS
2 fonts (271 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

271 KB total

Render-blocking

0

of 2

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 1.2 s LCP 2.8 shttps://www.rsna.org/css/RSNA/fontawesome/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.rsna.org/css/RSNA/fontawesome/webfonts/fa-solid-900.woff2 — 154.9 KiB — 87 ms — font-display: swaphttps://www.rsna.org/css/RSNA/fontawesome/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.rsna.org/css/RSNA/fontawesome/webfonts/fa-brands-400.woff2 — 116.2 KiB — 133 ms — font-display: swap
fa-solid-900.woff2 woff2 swap
Size 155 KB
Load time 87 ms
Start 534 ms
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-brands-400.woff2 woff2 swap
Size 116 KB
Load time 133 ms
Start 591 ms
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
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
Network Waterfall
84 requests over 1435ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.2 s LCP 2.8 shttps://rsna.org// https://rsna.org/ — 301 — 41 B — 144 ms — h2https://www.rsna.org/www.rsna.org/ https://www.rsna.org/ — 200 — 24.7 KiB — 131 ms — h2https://cdn.jsdelivr.net/npm/@popperjs/core@2.11.8/dist/umd/popper.min.jscdn.jsdelivr.net/npm/@popperjs/core... https://cdn.jsdelivr.net/npm/@popperjs/core@2.11.8/dist/umd/popper.min.js — 200 — 7.4 KiB — 27 ms — h2https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.min.jscdn.jsdelivr.net/npm/bootstrap@5.3.... https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.min.js — 200 — 16.9 KiB — 31 ms — h2https://www.rsna.org/bundles/rsna.js?v=3N6AO2JV_dC_QBdjE78xkG5kw3aAsc6NpO6y3kHwEEw1www.rsna.org/bundles/rsna.js?v=3N6A... https://www.rsna.org/bundles/rsna.js?v=3N6AO2JV_dC_QBdjE78xkG5kw3aAsc6NpO6y3kHwEEw1 — 200 — 8.5 KiB — 128 ms — h2https://www.rsna.org/css/RSNA/bootstrap-wide.min.csswww.rsna.org/css/RSNA/bootstrap-wid... https://www.rsna.org/css/RSNA/bootstrap-wide.min.css — 200 — 22.5 KiB — 77 ms — h2https://www.rsna.org/css/flexslider.csswww.rsna.org/css/flexslider.css https://www.rsna.org/css/flexslider.css — 200 — 1.9 KiB — 79 ms — h2https://www.rsna.org/bundles/rsna.css?v=XWqmDGTY6sj32D9ln6KD3YevOYJyUNG0qGoLwCVjq901www.rsna.org/bundles/rsna.css?v=XWq... https://www.rsna.org/bundles/rsna.css?v=XWqmDGTY6sj32D9ln6KD3YevOYJyUNG0qGoLwCVjq901 — 200 — 15.8 KiB — 126 ms — h2https://www.rsna.org/css/RSNA/fontawesome/css/fontawesome.min.csswww.rsna.org/css/RSNA/fontawesome/c... https://www.rsna.org/css/RSNA/fontawesome/css/fontawesome.min.css — 200 — 16.4 KiB — 103 ms — h2https://www.rsna.org/css/RSNA/fontawesome/css/brands.min.csswww.rsna.org/css/RSNA/fontawesome/c... https://www.rsna.org/css/RSNA/fontawesome/css/brands.min.css — 200 — 5.0 KiB — 101 ms — h2https://www.rsna.org/css/RSNA/fontawesome/css/regular.min.csswww.rsna.org/css/RSNA/fontawesome/c... https://www.rsna.org/css/RSNA/fontawesome/css/regular.min.css — 200 — 728 B — 105 ms — h2https://www.rsna.org/css/RSNA/fontawesome/css/solid.min.csswww.rsna.org/css/RSNA/fontawesome/c... https://www.rsna.org/css/RSNA/fontawesome/css/solid.min.css — 200 — 727 B — 102 ms — h2https://www.rsna.org/bundles/rsna/parallax.css?v=SpU7FRn__MoPfrUkea1X0tO8ns11up40y0lvHbeC5RA1www.rsna.org/bundles/rsna/parallax.... https://www.rsna.org/bundles/rsna/parallax.css?v=SpU7FRn__MoPfrUkea1X0tO8ns11up40y0lvHbeC5RA1 — 200 — 10.7 KiB — 120 ms — h2https://www.rsna.org/Scripts/jquery-3.5.1.min.jswww.rsna.org/Scripts/jquery-3.5.1.m... https://www.rsna.org/Scripts/jquery-3.5.1.min.js — 200 — 32.6 KiB — 117 ms — h2https://code.jquery.com/jquery-migrate-3.0.0.min.jscode.jquery.com/jquery-migrate-3.0.... https://code.jquery.com/jquery-migrate-3.0.0.min.js — 200 — 3.0 KiB — 18 ms — h2https://bfintal.github.io/Counter-Up/jquery.counterup.min.jsbfintal.github.io/Counter-Up/jquery... https://bfintal.github.io/Counter-Up/jquery.counterup.min.js — 200 — 962 B — 58 ms — h2https://cdnjs.cloudflare.com/ajax/libs/waypoints/2.0.3/waypoints.min.jscdnjs.cloudflare.com/ajax/libs/wayp... https://cdnjs.cloudflare.com/ajax/libs/waypoints/2.0.3/waypoints.min.js — 200 — 2.9 KiB — 46 ms — h3https://cdnjs.cloudflare.com/ajax/libs/gsap/2.0.1/TweenMax.min.jscdnjs.cloudflare.com/ajax/libs/gsap... https://cdnjs.cloudflare.com/ajax/libs/gsap/2.0.1/TweenMax.min.js — 200 — 33.5 KiB — 46 ms — h3https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.5/ScrollMagic.min.jscdnjs.cloudflare.com/ajax/libs/Scro... https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.5/ScrollMagic.min.js — 200 — 6.0 KiB — 34 ms — h3https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.5/plugins/animation.gsap.jscdnjs.cloudflare.com/ajax/libs/Scro... https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.5/plugins/animation.gsap.js — 200 — 4.1 KiB — 45 ms — h3https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.5/plugins/debug.addIndicators.jscdnjs.cloudflare.com/ajax/libs/Scro... https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.5/plugins/debug.addIndicators.js — 200 — 5.7 KiB — 46 ms — h3https://www.rsna.org/scripts/rsna/home/app.bundle.jswww.rsna.org/scripts/rsna/home/app.... https://www.rsna.org/scripts/rsna/home/app.bundle.js — 200 — 82.4 KiB — 162 ms — h2https://www.rsna.org/-/media/images/shared/svg-icons/x.svg?rev=fd35e5873e57446780cf80a9dbd95f38&hash=F2371AC5CFCF3B10D9F27EC6529FAC28www.rsna.org/-/media/images/shared/... https://www.rsna.org/-/media/images/shared/svg-icons/x.svg?rev=fd35e5873e57446780cf80a9dbd95f38&hash=F2371AC5CFCF3B10D9F27EC6529FAC28 — 200 — 1.1 KiB — 61 ms — h2https://www.rsna.org/-/media/images/rsna/menu/search.svg?iar=0&rev=c48ee66f02b74165b96d34016660727d&hash=EBA9E43AAFF4D02638D1BF78B66B64BCwww.rsna.org/-/media/images/rsna/me... https://www.rsna.org/-/media/images/rsna/menu/search.svg?iar=0&rev=c48ee66f02b74165b96d34016660727d&hash=EBA9E43AAFF4D02638D1BF78B66B64BC — 200 — 1.1 KiB — 59 ms — h2https://www.rsna.org/-/media/images/rsna/menu/news.svg?iar=0&rev=1364f1293bd348358435112e92091162&hash=CEB31A210CA6B7360146351A8C92D45Cwww.rsna.org/-/media/images/rsna/me... https://www.rsna.org/-/media/images/rsna/menu/news.svg?iar=0&rev=1364f1293bd348358435112e92091162&hash=CEB31A210CA6B7360146351A8C92D45C — 200 — 2.4 KiB — 54 ms — h2https://www.rsna.org/-/media/images/rsna/menu/about.svg?iar=0&rev=aba2259b74b8411da4e178c9aae4c2f0&hash=052AA8A20BD401318144550AAACC1AA9www.rsna.org/-/media/images/rsna/me... https://www.rsna.org/-/media/images/rsna/menu/about.svg?iar=0&rev=aba2259b74b8411da4e178c9aae4c2f0&hash=052AA8A20BD401318144550AAACC1AA9 — 200 — 2.4 KiB — 59 ms — h2https://www.rsna.org/-/media/images/rsna/menu/donate.svg?iar=0&rev=0b13d736682b44ea924df3ee55fd38b3&hash=A45E53061772786B7738D6C388594307www.rsna.org/-/media/images/rsna/me... https://www.rsna.org/-/media/images/rsna/menu/donate.svg?iar=0&rev=0b13d736682b44ea924df3ee55fd38b3&hash=A45E53061772786B7738D6C388594307 — 200 — 1.3 KiB — 59 ms — h2https://www.rsna.org/scripts/rsna/l2/main.jswww.rsna.org/scripts/rsna/l2/main.j... https://www.rsna.org/scripts/rsna/l2/main.js — 200 — 4.5 KiB — 54 ms — h2https://web.cmp.usercentrics.eu/ui/loader.jsweb.cmp.usercentrics.eu/ui/loader.j... https://web.cmp.usercentrics.eu/ui/loader.js — 200 — 15.6 KiB — 48 ms — h2https://www.rsna.org/-/media/images/rsna/menu/join.svg?iar=0&rev=c2ef64dc4c0f4b85ada0e089097a6a33&hash=535BCD862BCBB6DDDBAFC5D9ACACCA14www.rsna.org/-/media/images/rsna/me... https://www.rsna.org/-/media/images/rsna/menu/join.svg?iar=0&rev=c2ef64dc4c0f4b85ada0e089097a6a33&hash=535BCD862BCBB6DDDBAFC5D9ACACCA14 — 200 — 1.2 KiB — 61 ms — h2
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h2https://web.cmp.usercentrics.eu/ui/v/3.117.0/GdprCmpController.c4576b71.jsweb.cmp.usercentrics.eu/ui/v/3.117.... https://web.cmp.usercentrics.eu/ui/v/3.117.0/GdprCmpController.c4576b71.js — 200 — 9.4 KiB — 19 ms — h3https://www.rsna.org/-/media/Images/RSNA/sandbox/homev3/hands-001.jpgwww.rsna.org/-/media/Images/RSNA/sa... https://www.rsna.org/-/media/Images/RSNA/sandbox/homev3/hands-001.jpg — 200 — 223.2 KiB — 72 ms — h2https://uct.service.usercentrics.eu/uct?v=2&sid=O2nlxCc3B2F2zh&t=24&abv=&r=https%3A%2F%2Fwww.rsna.org%2F&cb=1776898015388uct.service.usercentrics.eu/uct?v=2... https://uct.service.usercentrics.eu/uct?v=2&sid=O2nlxCc3B2F2zh&t=24&abv=&r=https%3A%2F%2Fwww.rsna.org%2F&cb=1776898015388 — 200 — 236 B — 197 ms — h2https://consent-api.service.consent.usercentrics.eu/consent/uw/3consent-api.service.consent.usercen... https://consent-api.service.consent.usercentrics.eu/consent/uw/3 — 204 — 0 B — 208 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 663ms · 114KB · $9/mo
Unattributable
Other
Costly
Execution 233ms
Transfer 0 KB
Monthly Cost $3/mo
www.rsna.org
Other
Optional
Execution 199ms
Transfer 25 KB
Monthly Cost $3/mo
cdnjs
CDN
Optional
Execution 177ms
Transfer 34 KB
Monthly Cost $2/mo
web.cmp.usercentrics.eu
Other
Optional
Execution 54ms
Transfer 56 KB
Unused 63%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 233ms 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

Unattributable takes 233ms 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

63% of web.cmp.usercentrics.eu'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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