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https://shinyapps.io

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
2
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
78
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
74
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

1.71 s

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

2.51 s

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

34 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.

1.71 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.

2.51 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
7 PASS 4 REVIEW 2 FIX
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 (1.0 MiB of 1.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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
4 images, 0 KB saveable
REVIEW
4 images, 0 KB saveable
Warning::
https://www.shinyapps.io/images/static-hero.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.shinyapps.io/images/preview-dashboard-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.shinyapps.io/images/preview-login.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.shinyapps.io/images/preview-dashboard.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
4 images 190 KB
0 oversized -0 KB
4 legacy format
4 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

C
JS Bundles
Action
8 scripts, 278 KB unused
REVIEW
8 scripts, 278 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-2C0W...: 67 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HXP0...: 67 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KHB...: 62 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.shinyapps.io/admin/components/jquery/d...: 53 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.shinyapps.io/admin/components/bootstra...: 29 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 278 KB
278 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-2C0WZ1JHG0&cx=c&gtm=4e64k0h1158 KB67 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-HXP006LBGY&cx=c&gtm=4e64k0h1156 KB67 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KHBDBW7134 KB62 KB (47%)✓3rd
https://www.shinyapps.io/admin/components/jquery/dist/jquery.min.js88 KB53 KB (60%)✓3rd
https://www.shinyapps.io/admin/components/bootstrap/dist/js/bootstrap.min.js39 KB29 KB (75%)✓3rd
https://cdn.jsdelivr.net/npm/search-insights@2.2.13 KB—✓3rd
https://www.shinyapps.io/scripts/lib/smooth-scroll.js1 KB—✓3rd
https://www.shinyapps.io/scripts/main.js2 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

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

B
Page Weight Inventory
25 resources · 1.0 MB · 278 KB savings available
REVIEW
25 resources · 1.0 MB · 278 KB savings available
Warning::
Page weight 24 KB over 1MB target
Got: 1.0 MB Expected: ≤ 1 MB
Info::
~278 KB of savings available
Warning::
24 third-party resources (100% of weight)
25 resources · 1.0 MiB · 24 third-party 23.7 KiB over 1MB target
JavaScript 55% · 580.1 KiB
Image 20% · 205.1 KiB
CSS 12% · 127.6 KiB
Font 10% · 106.5 KiB
Document 3% · 27.7 KiB
Other 0% · 694 B

~277.9 KiB of savings available

Remove unused JavaScript: 277.9 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Page Weight Budget
1.0 MB transferred, 25 requests
PASS
1.0 MB transferred, 25 requests
Info::
Page weighs 1.9 MB (1.0 MB transferred)
Warning::
JavaScript is 580 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 580 KB
Info::
25 HTTP requests
Info::
Estimated 0.21 g CO2 per page load
1.0 MB / 2.4 MB budget
1.0 MB transferred
25 requests
0.21 g CO2 per page load
JavaScript 580.1 KiB 55%
Images 190.1 KiB 18%
CSS 127.6 KiB 12%
Fonts 106.5 KiB 10%
HTML 27.6 KiB 3%
Other 15.1 KiB 1%
Other 694 B 0%
0 2.4 MB 4.9 MB
Under 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

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+
JS Execution Cost
222ms total JS execution
PASS
222ms total JS execution
Info::
https://www.googletagmanager.com/gtag/js?id=G-2C0W...: 81ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-HXP0...: 78ms CPU time
Info::
https://www.shinyapps.io/: 63ms CPU time
Warning::
Third-party scripts: 222ms (100% of total)

Main Thread Breakdown

Script Evaluation 52% Style & Layout 19% Other 14% Script Parsing & Compilation 9% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtag/js?id=G-2C0WZ1JHG0&cx=c&gtm=4e64k0h181ms67ms9ms3rd
https://www.googletagmanager.com/gtag/js?id=G-HXP006LBGY&cx=c&gtm=4e64k0h178ms52ms10ms3rd
https://www.shinyapps.io/63ms2ms1ms3rd
A+
Font Loading
2 fonts (106 KB)
PASS
2 fonts (106 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

106 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 1.7 s LCP 2.5 shttps://maxcdn.bootstrapcdn.com/font-awesome/4.2.0/fonts/fontawesome-webfont.woff?v=4.2.0fontawesome-webfont.woff https://maxcdn.bootstrapcdn.com/font-awesome/4.2.0/fonts/fontawesome-webfont.woff?v=4.2.0 — 64.5 KiB — 79 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 42.0 KiB — 37 ms — font-display: swap
fontawesome-webfont.woff woff swap
Size 65 KB
Load time 79 ms
Start 863 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 37 ms
Start 985 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 ~19 KB and ~38 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
25 requests over 1181ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.7 s LCP 2.5 shttps://shinyapps.io// https://shinyapps.io/ — 301 — 86 B — 302 ms — h2https://www.shinyapps.io/www.shinyapps.io/ https://www.shinyapps.io/ — 200 — 27.2 KiB — 204 ms — h2https://fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,400,600,300,700fonts.googleapis.com/css?family=Ope... https://fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,400,600,300,700 — 200 — 2.6 KiB — 97 ms — h2https://maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.cssmaxcdn.bootstrapcdn.com/font-awesom... https://maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css — 200 — 5.5 KiB — 50 ms — h3https://www.shinyapps.io/styles/main.csswww.shinyapps.io/styles/main.css https://www.shinyapps.io/styles/main.css — 200 — 119.5 KiB — 403 ms — h2https://www.shinyapps.io/images/static-hero.pngwww.shinyapps.io/images/static-hero... https://www.shinyapps.io/images/static-hero.png — 200 — 72.0 KiB — 497 ms — h2https://www.shinyapps.io/images/preview-dashboard-2.pngwww.shinyapps.io/images/preview-das... https://www.shinyapps.io/images/preview-dashboard-2.png — 200 — 36.7 KiB — 497 ms — h2https://www.shinyapps.io/images/preview-login.pngwww.shinyapps.io/images/preview-log... https://www.shinyapps.io/images/preview-login.png — 200 — 53.2 KiB — 400 ms — h2https://www.shinyapps.io/images/preview-dashboard.pngwww.shinyapps.io/images/preview-das... https://www.shinyapps.io/images/preview-dashboard.png — 200 — 28.3 KiB — 400 ms — h2https://www.shinyapps.io/admin/components/jquery/dist/jquery.min.jswww.shinyapps.io/admin/components/j... https://www.shinyapps.io/admin/components/jquery/dist/jquery.min.js — 200 — 87.7 KiB — 494 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-KHBDBW7www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-KHBDBW7 — 200 — 133.9 KiB — 154 ms — h2https://www.googletagmanager.com/ns.html?id=GTM-KHBDBW7www.googletagmanager.com/ns.html?id... https://www.googletagmanager.com/ns.html?id=GTM-KHBDBW7 — 200 — 437 B — 75 ms — h2https://www.googletagmanager.com/gtag/js?id=G-HXP006LBGY&cx=c&gtm=4e64k0h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-HXP006LBGY&cx=c&gtm=4e64k0h1 — 200 — 156.0 KiB — 60 ms — h2https://cdn.jsdelivr.net/npm/search-insights@2.2.1cdn.jsdelivr.net/npm/search-insight... https://cdn.jsdelivr.net/npm/search-insights@2.2.1 — 200 — 3.0 KiB — 7 ms — h2https://www.googletagmanager.com/gtag/js?id=G-2C0WZ1JHG0&cx=c&gtm=4e64k0h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-2C0WZ1JHG0&cx=c&gtm=4e64k0h1 — 200 — 157.8 KiB — 71 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-HXP006LBGY&gtm=45je64k0h1v9103200785z89103206369za20gzb9103206369zd9103206369&_p=1776891466213&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1352061836.1776891467&frm=0&pscdl=noapi&rcb=1&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938465~115938468~117266400~117512542&sid=1776891466&sct=1&seg=0&dl=https%3A%2F%2Fwww.shinyapps.io%2F&dt=shinyapps.io&_tu=QA&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=842region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-HXP006LBGY&gtm=45je64k0h1v9103200785z89103206369za20gzb9103206369zd9103206369&_p=1776891466213&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1352061836.1776891467&frm=0&pscdl=noapi&rcb=1&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938465~115938468~117266400~117512542&sid=1776891466&sct=1&seg=0&dl=https%3A%2F%2Fwww.shinyapps.io%2F&dt=shinyapps.io&_tu=QA&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=842 — 204 — 550 B — 155 ms — h2https://maxcdn.bootstrapcdn.com/font-awesome/4.2.0/fonts/fontawesome-webfont.woff?v=4.2.0maxcdn.bootstrapcdn.com/font-awesom... https://maxcdn.bootstrapcdn.com/font-awesome/4.2.0/fonts/fontawesome-webfont.woff?v=4.2.0 — 200 — 64.5 KiB — 79 ms — h3https://www.shinyapps.io/admin/components/bootstrap/dist/js/bootstrap.min.jswww.shinyapps.io/admin/components/b... https://www.shinyapps.io/admin/components/bootstrap/dist/js/bootstrap.min.js — 200 — 39.0 KiB — 104 ms — h2https://www.shinyapps.io/scripts/lib/smooth-scroll.jswww.shinyapps.io/scripts/lib/smooth... https://www.shinyapps.io/scripts/lib/smooth-scroll.js — 200 — 1.1 KiB — 105 ms — h2https://www.shinyapps.io/scripts/main.jswww.shinyapps.io/scripts/main.js https://www.shinyapps.io/scripts/main.js — 200 — 1.6 KiB — 106 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-2C0WZ1JHG0&gtm=45je64k0h1v9103644783z89103206369za20gzb9103206369zd9103206369&_p=1776891466213&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1352061836.1776891467&frm=0&pscdl=noapi&rcb=0&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266401~117512542~118463262&sid=1776891466&sct=1&seg=0&dl=https%3A%2F%2Fwww.shinyapps.io%2F&dt=shinyapps.io&en=page_view&_fv=1&_ss=1&tfd=923region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-2C0WZ1JHG0&gtm=45je64k0h1v9103644783z89103206369za20gzb9103206369zd9103206369&_p=1776891466213&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1352061836.1776891467&frm=0&pscdl=noapi&rcb=0&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266401~117512542~118463262&sid=1776891466&sct=1&seg=0&dl=https%3A%2F%2Fwww.shinyapps.io%2F&dt=shinyapps.io&en=page_view&_fv=1&_ss=1&tfd=923 — 204 — 48 B — 75 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-SG5RN9F6BG&gtm=45je64k0h1v9103644783z89103206369za20gzb9103206369zd9103206369&_p=1776891466213&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1352061836.1776891467&frm=0&pscdl=noapi&rcb=0&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266401~117512542~118463262&sid=1776891466&sct=1&seg=0&dl=https%3A%2F%2Fwww.shinyapps.io%2F&dt=shinyapps.io&en=page_view&_fv=1&_ss=1&tfd=932region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-SG5RN9F6BG&gtm=45je64k0h1v9103644783z89103206369za20gzb9103206369zd9103206369&_p=1776891466213&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1352061836.1776891467&frm=0&pscdl=noapi&rcb=0&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266401~117512542~118463262&sid=1776891466&sct=1&seg=0&dl=https%3A%2F%2Fwww.shinyapps.io%2F&dt=shinyapps.io&en=page_view&_fv=1&_ss=1&tfd=932 — 204 — 48 B — 67 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-4QVBMYL7WR&gtm=45je64k0h1v9103644783z89103206369za20gzb9103206369zd9103206369&_p=1776891466213&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1352061836.1776891467&frm=0&pscdl=noapi&rcb=0&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266401~117512542~118463262&sid=1776891466&sct=1&seg=0&dl=https%3A%2F%2Fwww.shinyapps.io%2F&dt=shinyapps.io&en=page_view&_fv=1&_ss=1&tfd=937region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-4QVBMYL7WR&gtm=45je64k0h1v9103644783z89103206369za20gzb9103206369zd9103206369&_p=1776891466213&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1352061836.1776891467&frm=0&pscdl=noapi&rcb=0&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266401~117512542~118463262&sid=1776891466&sct=1&seg=0&dl=https%3A%2F%2Fwww.shinyapps.io%2F&dt=shinyapps.io&en=page_view&_fv=1&_ss=1&tfd=937 — 204 — 48 B — 62 ms — h2https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2fonts.gstatic.com/s/opensans/v44/me... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 200 — 42.0 KiB — 37 ms — h3https://www.shinyapps.io/favicon.icowww.shinyapps.io/favicon.ico https://www.shinyapps.io/favicon.ico — 200 — 15.0 KiB — 103 ms — h2
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 222ms · 341KB · $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 81ms
Transfer 158 KB
Unused 42%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 78ms
Transfer 156 KB
Unused 43%
Monthly Cost $1/mo
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Execution 63ms
Transfer 27 KB
Monthly Cost $1/mo

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.

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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

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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