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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
41
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.
73
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

3.17 s

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

17.00 s

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

1.20 s

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.

5.28 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.

17.08 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
8 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
2.9 MB transferred, 80 requests
FIX
2.9 MB transferred, 80 requests
Warning::
Page weighs 7.5 MB (2.9 MB transferred)
Warning::
JavaScript is 1.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.6 MB
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Info::
80 HTTP requests
Info::
Estimated 0.62 g CO2 per page load
2.9 MB / 2.4 MB budget
2.9 MB transferred
80 requests
0.62 g CO2 per page load
JavaScript 1.6 MiB 55%
Images 1.1 MiB 39%
CSS 101.5 KiB 3%
Fonts 55.9 KiB 2%
Other 25.9 KiB 1%
HTML 12.1 KiB 0%
Other 1.8 KiB 0%
Other 1.6 KiB 0%
Other 549 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

D
Third-Party Impact
Action
99% third-party, 0 ms blocking
FIX
99% third-party, 0 ms blocking
Warning::
Third-party code accounts for 99% of page weight (2.9 MiB of 2.9 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
F
JS Execution Cost
Action
3580ms total JS execution
FIX
3580ms total JS execution
Warning::
https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml...: 431ms CPU time
Warning::
Unattributable: 399ms CPU time
Warning::
https://aacr.silverchair-cdn.com/Themes/Client/app...: 275ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-C8E9...: 269ms CPU time
Warning::
https://ajax.googleapis.com/ajax/libs/jquery/3.4.1...: 252ms CPU time
Warning::
Third-party scripts: 3168ms (88% of total)

Main Thread Breakdown

Script Evaluation 66% Script Parsing & Compilation 14% Other 12% Style & Layout 6%
ScriptTotalScriptingParse/CompileParty
https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js431ms324ms105ms3rd
Unattributable399ms12ms0ms3rd
https://aacr.silverchair-cdn.com/Themes/Client/app/jsdist/v-639116337507511173/site.min.js275ms77ms49ms3rd
https://www.googletagmanager.com/gtag/js?id=G-C8E9HV22QS&cx=c&gtm=4e64k0269ms232ms35ms3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js252ms203ms8ms3rd
https://aacrjournals.org/cdn-cgi/challenge-platform/scripts/jsd/main.js252ms218ms3ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-57J8MM3227ms191ms32ms3rd
https://www.googletagmanager.com/gtag/js?id=G-H8RVJMMDF7&cx=c&_slc=1211ms176ms33ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604210101/pubads_impl.js?cb=31098008180ms127ms48ms3rd
https://aacrjournals.org/160ms52ms8ms1st

Showing top 10 of 19 scripts

F
JS Bundles
Action
26 scripts, 808 KB unused
FIX
26 scripts, 808 KB unused
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 133 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml...: 122 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://aacr.silverchair-cdn.com/Themes/Client/app...: 104 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PQ4...: 67 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5B3...: 66 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 808 KB
808 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604210101/pubads_impl.js?cb=31098008188 KB133 KB (71%)✓3rd
https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js251 KB122 KB (49%)✓3rd
https://aacr.silverchair-cdn.com/Themes/Client/app/jsdist/v-639116337507511173/site.min.js133 KB104 KB (79%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PQ4CDD2111 KB67 KB (60%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5B3WW8F5113 KB66 KB (59%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-H8RVJMMDF7&cx=c&_slc=1148 KB65 KB (44%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K39SQDNT115 KB64 KB (56%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-57J8MM3134 KB61 KB (46%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-C8E9HV22QS&cx=c&gtm=4e64k0157 KB61 KB (39%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB38 KB (67%)✓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
80 resources · 2.9 MB · 808 KB savings available
FIX
80 resources · 2.9 MB · 808 KB savings available
Warning::
Page weight 1.9 MB over 1MB target
Got: 2.9 MB Expected: ≤ 1 MB
Info::
~808 KB of savings available
Warning::
76 third-party resources (99% of weight)
Info::
1 resources over 200KB
80 resources · 2.9 MiB · 76 third-party 1.9 MiB over 1MB target
JavaScript 55% · 1.6 MiB
Image 39% · 1.1 MiB
CSS 3% · 101.5 KiB
Font 2% · 55.9 KiB
Other 1% · 27.3 KiB
Document 0% · 12.1 KiB

~808.3 KiB of savings available

Remove unused JavaScript: 808.3 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
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
Warning::
https://aacr.silverchair-cdn.com/data/SiteBuilderA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/data/SiteBuilderA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://aacr.silverchair-cdn.com/ImageLibrary/umbr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
35 images 1.1 MB
0 oversized -0 KB
35 legacy format
25 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

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

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

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 (56 KB)
PASS
2 fonts (56 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

56 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 3.2 s LCP 17.0 shttps://aacr.silverchair-cdn.com/Themes/Silver/app/icons/v-639102489936978178/fonts/white-label.ttf?7yqv1cwhite-label.ttf https://aacr.silverchair-cdn.com/Themes/Silver/app/icons/v-639102489936978178/fonts/white-label.ttf?7yqv1c — 21.2 KiB — 61 ms — font-display: swaphttps://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WlhyyTh89Y.woff2JTUSjIg1_i6t8kCHKm459Wl... https://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WlhyyTh89Y.woff2 — 34.7 KiB — 37 ms — font-display: swap
white-label.ttf ttf swap
Size 21 KB
Load time 61 ms
Start 714 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
JTUSjIg1_i6t8kCHKm459Wl... woff2 swap
Size 35 KB
Load time 37 ms
Start 715 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)

Fixing the unchecked items could save ~6 KB and ~12 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
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
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
80 requests over 1812ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 3.2 s LCP 17.0 shttps://aacrjournals.org// https://aacrjournals.org/ — 200 — 12.1 KiB — 475 ms — h2https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js — 200 — 30.7 KiB — 118 ms — h2https://aacr.silverchair-cdn.com/Themes/Silver/app/vendor/v-639102489972463725/jquery-migrate-3.1.0.min.jsaacr.silverchair-cdn.com/Themes/Sil... https://aacr.silverchair-cdn.com/Themes/Silver/app/vendor/v-639102489972463725/jquery-migrate-3.1.0.min.js — 200 — 3.9 KiB — 126 ms — h2https://aacr.silverchair-cdn.com/Themes/Client/app/css/v-639116336388584864/site.min.cssaacr.silverchair-cdn.com/Themes/Cli... https://aacr.silverchair-cdn.com/Themes/Client/app/css/v-639116336388584864/site.min.css — 200 — 96.7 KiB — 123 ms — h2https://aacr.silverchair-cdn.com/Themes/Silver/app/icons/v-639102489936978178/style.cssaacr.silverchair-cdn.com/Themes/Sil... https://aacr.silverchair-cdn.com/Themes/Silver/app/icons/v-639102489936978178/style.css — 200 — 1.9 KiB — 122 ms — h2https://aacr.silverchair-cdn.com/Themes/Client/app/css/v-639102487800924731/bg_img.cssaacr.silverchair-cdn.com/Themes/Cli... https://aacr.silverchair-cdn.com/Themes/Client/app/css/v-639102487800924731/bg_img.css — 200 — 659 B — 123 ms — h2https://fonts.googleapis.com/css2?family=Montserrat:ital,wght@0,300;0,400;0,700;1,300;1,400;1,700&display=swapfonts.googleapis.com/css2?family=Mo... https://fonts.googleapis.com/css2?family=Montserrat:ital,wght@0,300;0,400;0,700;1,300;1,400;1,700&display=swap — 200 — 1.2 KiB — 94 ms — h2https://aacr.silverchair-cdn.com/data/SiteBuilderAssets/Live/CSS/umbrella/v-638803291138127560/site.cssaacr.silverchair-cdn.com/data/SiteB... 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https://aacr.silverchair-cdn.com/ImageLibrary/umbrella/spotlight/PUB_HotTopicColl.jpg?versionId=8907 — 200 — 134.0 KiB — 33 ms — h2https://aacr.silverchair-cdn.com/ImageLibrary/umbrella/spotlight/Simul-Pubs-417x226.jpg?versionId=8822aacr.silverchair-cdn.com/ImageLibra... https://aacr.silverchair-cdn.com/ImageLibrary/umbrella/spotlight/Simul-Pubs-417x226.jpg?versionId=8822 — 200 — 19.6 KiB — 41 ms — h2https://aacr.silverchair-cdn.com/ImageLibrary/umbrella/spotlight/PUBFeatArtic_JournalAwardee.jpg?versionId=8908aacr.silverchair-cdn.com/ImageLibra... https://aacr.silverchair-cdn.com/ImageLibrary/umbrella/spotlight/PUBFeatArtic_JournalAwardee.jpg?versionId=8908 — 200 — 108.4 KiB — 580 ms — h2https://aacr.silverchair-cdn.com/Themes/Client/app/jsdist/v-639116337507511173/site.min.jsaacr.silverchair-cdn.com/Themes/Cli... https://aacr.silverchair-cdn.com/Themes/Client/app/jsdist/v-639116337507511173/site.min.js — 200 — 132.8 KiB — 50 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
88% of JavaScript execution is third-party
First-party Third-party 3168ms · 1617KB · $42/mo
jsDelivr
CDN
Costly
Execution 431ms
Transfer 251 KB
Unused 49%
Monthly Cost $6/mo
Unattributable
Other
Costly
Execution 399ms
Transfer 0 KB
Monthly Cost $5/mo
aacr.silverchair-cdn.com
Other
Costly
Execution 275ms
Transfer 133 KB
Unused 79%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 269ms
Transfer 157 KB
Unused 39%
Monthly Cost $4/mo
ajax.googleapis.com
Other
Costly
Execution 252ms
Transfer 31 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 227ms
Transfer 134 KB
Unused 46%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 211ms
Transfer 148 KB
Unused 44%
Monthly Cost $3/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 180ms
Transfer 188 KB
Unused 71%
Monthly Cost $2/mo
Hotjar
Session Replay
Optional
Execution 156ms
Transfer 57 KB
Unused 67%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 147ms
Transfer 115 KB
Unused 56%
Monthly Cost $2/mo
cdn.feathr.co
Other
Optional
Execution 119ms
Transfer 42 KB
Monthly Cost $2/mo
widgets.figshare.com
Other
Optional
Execution 111ms
Transfer 36 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 99ms
Transfer 113 KB
Unused 59%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 91ms
Transfer 111 KB
Unused 60%
Monthly Cost $1/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 78ms
Transfer 34 KB
Monthly Cost $1/mo
Google Analytics
Analytics
Optional
Execution 66ms
Transfer 21 KB
Monthly Cost $1/mo
platform-api.sharethis.com
Other
Optional
Execution 57ms
Transfer 47 KB
Unused 59%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • jsDelivr adds 431ms and costs ~$6/month
  • Unattributable adds 399ms and costs ~$5/month
  • aacr.silverchair-cdn.com adds 275ms and costs ~$4/month
  • Google Tag Manager adds 269ms and costs ~$4/month
  • ajax.googleapis.com adds 252ms and costs ~$3/month
  • Google Tag Manager adds 227ms and costs ~$3/month
  • Google Tag Manager adds 211ms and costs ~$3/month

88% 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

jsDelivr takes 431ms 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 399ms 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

aacr.silverchair-cdn.com takes 275ms 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

79% of aacr.silverchair-cdn.com'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

Google Tag Manager takes 269ms 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

ajax.googleapis.com takes 252ms 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 227ms 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 211ms 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

71% of securepubads.g.doubleclick.net'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

67% of Hotjar'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

56% 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

59% 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

60% 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

59% of platform-api.sharethis.com'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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