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https://clinicaltrials.gov

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
2
REVIEW
5
PASS
6
INFO
2

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

Mobile Desktop
81
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.

740 ms

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

2.26 s

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

72 ms

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

0.126

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

1.68 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.

2.27 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
6 PASS 5 REVIEW 2 FIX
D
Page Weight Inventory
Action
99 resources · 1.4 MB · 261 KB savings available
FIX
99 resources · 1.4 MB · 261 KB savings available
Warning::
Page weight 387 KB over 1MB target
Got: 1.4 MB Expected: ≤ 1 MB
Info::
~261 KB of savings available
Warning::
30 third-party resources (46% of weight)
Info::
1 resources over 200KB
99 resources · 1.4 MiB · 30 third-party 386.7 KiB over 1MB target
JavaScript 68% · 955.2 KiB
Image 20% · 285.5 KiB
CSS 7% · 100.5 KiB
Font 3% · 42.2 KiB
Document 1% · 15.2 KiB
Other 1% · 12.1 KiB

~261.4 KiB of savings available

Remove unused JavaScript: 261.4 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-cache,no-store, max-age=0, must-revalidate
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

no-cache,no-store, max-age=0, must-revalidate

DirectiveValueMeaning
no-cache—Cache but always revalidate first
no-store—Never cache this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
B
Page Weight Budget
1.4 MB transferred, 99 requests
REVIEW
1.4 MB transferred, 99 requests
Info::
Page weighs 4.4 MB (1.4 MB transferred)
Warning::
JavaScript is 955 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 955 KB
Info::
99 HTTP requests
Info::
Estimated 0.29 g CO2 per page load
1.4 MB / 2.4 MB budget
1.4 MB transferred
99 requests
0.29 g CO2 per page load
JavaScript 955.2 KiB 68%
Images 252.3 KiB 18%
CSS 100.5 KiB 7%
Fonts 42.2 KiB 3%
Other 33.8 KiB 2%
HTML 14.6 KiB 1%
Other 11.4 KiB 1%
Other 687 B 0%
Other 0 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

B
Third-Party Impact
46% third-party, 0 ms blocking
REVIEW
46% third-party, 0 ms blocking
Info::
Third-party code accounts for 46% of page weight (648.8 KiB of 1.4 MiB)
Info::
Third-party blocking time is low (0 ms)
54%
46%
First-party Third-party
C
Image Optimization
Action
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Warning::
https://clinicaltrials.gov/assets/images/warning.s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://clinicaltrials.gov/assets/images/ctg-foote... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iad1.qualtrics.com/WRQualtricsSiteIntercep... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://clinicaltrials.gov/assets/uswds/img/us_fla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://clinicaltrials.gov/assets/main/img/AgencyL... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
19 images 252 KB
0 oversized -0 KB
17 legacy format
5 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

C
JS Execution Cost
Action
1091ms total JS execution
REVIEW
1091ms total JS execution
Warning::
https://clinicaltrials.gov/polyfills-6ISPNSXF.js: 413ms CPU time
Info::
Unattributable: 213ms CPU time
Info::
https://clinicaltrials.gov/: 164ms CPU time
Info::
https://clinicaltrials.gov/chunk-PVALZXTS.js: 100ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-DP2X...: 73ms CPU time
Info::
Third-party scripts: 414ms (38% of total)

Main Thread Breakdown

Script Evaluation 57% Other 18% Style & Layout 11% Parse HTML & CSS 5% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://clinicaltrials.gov/polyfills-6ISPNSXF.js413ms337ms0ms1st
Unattributable213ms34ms0ms3rd
https://clinicaltrials.gov/164ms2ms0ms1st
https://clinicaltrials.gov/chunk-PVALZXTS.js100ms95ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-DP2X732JSX&l=pingerDataLayer&cx=c&gtm=4e64h173ms59ms13ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L73ms59ms13ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PC9B6M3&l=pingerDataLayer55ms42ms12ms3rd
C
JS Bundles
Action
48 scripts, 261 KB unused
REVIEW
48 scripts, 261 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DP2X...: 62 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 62 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PC9...: 60 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://clinicaltrials.gov/chunk-FOI7A4D4.js: 29 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://clinicaltrials.gov/chunk-J3DBZWUT.js: 26 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 261 KB
261 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-DP2X732JSX&l=pingerDataLayer&cx=c&gtm=4e64h1148 KB62 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB62 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PC9B6M3&l=pingerDataLayer130 KB60 KB (47%)✓3rd
https://clinicaltrials.gov/chunk-FOI7A4D4.js54 KB29 KB (54%)✓1st
https://clinicaltrials.gov/chunk-J3DBZWUT.js70 KB26 KB (36%)✓1st
https://siteintercept.qualtrics.com/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=clinicaltrials.gov36 KB21 KB (60%)✓3rd
https://clinicaltrials.gov/scripts-2KLTL4Y7.js29 KB—✓1st
https://clinicaltrials.gov/chunk-ELQWUAPR.js6 KB—✓1st
https://clinicaltrials.gov/chunk-CET22XHF.js2 KB—✓1st
https://clinicaltrials.gov/chunk-ZTDDVPAW.js2 KB—✓1st

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

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
1 fonts (42 KB)
PASS
1 fonts (42 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

42 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 740 ms LCP 2.3 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2 — 42.2 KiB — 27 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 42 KB
Load time 27 ms
Start 258 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

Network Waterfall
99 requests over 2234ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 740 ms LCP 2.3 shttps://clinicaltrials.gov// https://clinicaltrials.gov/ — 200 — 14.6 KiB — 223 ms — h2https://clinicaltrials.gov/styles-K5ERNWXN.css/styles-K5ERNWXN.css https://clinicaltrials.gov/styles-K5ERNWXN.css — 200 — 100.5 KiB — 401 ms — h2https://clinicaltrials.gov/assets/images/glossary-panel/open-glossary-drawer.svg/assets/images/glossary-panel/open-... https://clinicaltrials.gov/assets/images/glossary-panel/open-glossary-drawer.svg — 200 — 4.6 KiB — 146 ms — h2https://clinicaltrials.gov/assets/images/glossary-panel/glossary-icon.svg/assets/images/glossary-panel/gloss... https://clinicaltrials.gov/assets/images/glossary-panel/glossary-icon.svg — 200 — 783 B — 135 ms — h2https://clinicaltrials.gov/assets/images/glossary-panel/close-glossary-drawer.svg/assets/images/glossary-panel/close... https://clinicaltrials.gov/assets/images/glossary-panel/close-glossary-drawer.svg — 200 — 4.6 KiB — 142 ms — h2https://clinicaltrials.gov/assets/uswds/img/sprite.svg/assets/uswds/img/sprite.svg https://clinicaltrials.gov/assets/uswds/img/sprite.svg — 200 — 22.1 KiB — 148 ms — h2https://cdn.ncbi.nlm.nih.gov/core/pinger/pinger.jscdn.ncbi.nlm.nih.gov/core/pinger/pi... https://cdn.ncbi.nlm.nih.gov/core/pinger/pinger.js — 200 — 29.7 KiB — 26 ms — h2https://clinicaltrials.gov/chunk-CSFWWYAD.js/chunk-CSFWWYAD.js https://clinicaltrials.gov/chunk-CSFWWYAD.js — 200 — 1.8 KiB — 138 ms — h2https://clinicaltrials.gov/chunk-4RLMJJU6.js/chunk-4RLMJJU6.js https://clinicaltrials.gov/chunk-4RLMJJU6.js — 200 — 3.4 KiB — 135 ms — h2https://clinicaltrials.gov/chunk-A4TKQV37.js/chunk-A4TKQV37.js https://clinicaltrials.gov/chunk-A4TKQV37.js — 200 — 19.5 KiB — 197 ms — h2https://clinicaltrials.gov/chunk-PQ7UAPLD.js/chunk-PQ7UAPLD.js https://clinicaltrials.gov/chunk-PQ7UAPLD.js — 200 — 25.5 KiB — 251 ms — h2https://clinicaltrials.gov/chunk-6K3D2Y6T.js/chunk-6K3D2Y6T.js https://clinicaltrials.gov/chunk-6K3D2Y6T.js — 200 — 3.9 KiB — 162 ms — h2https://clinicaltrials.gov/chunk-IIYQDVVA.js/chunk-IIYQDVVA.js https://clinicaltrials.gov/chunk-IIYQDVVA.js — 200 — 15.1 KiB — 188 ms — h2https://clinicaltrials.gov/chunk-KX25CUXS.js/chunk-KX25CUXS.js https://clinicaltrials.gov/chunk-KX25CUXS.js — 200 — 1.2 KiB — 151 ms — h2https://clinicaltrials.gov/chunk-CET22XHF.js/chunk-CET22XHF.js https://clinicaltrials.gov/chunk-CET22XHF.js — 200 — 1.7 KiB — 149 ms — h2https://clinicaltrials.gov/chunk-ZTDDVPAW.js/chunk-ZTDDVPAW.js https://clinicaltrials.gov/chunk-ZTDDVPAW.js — 200 — 2.5 KiB — 215 ms — h2https://clinicaltrials.gov/chunk-EQYVI5PP.js/chunk-EQYVI5PP.js https://clinicaltrials.gov/chunk-EQYVI5PP.js — 200 — 1.4 KiB — 205 ms — h2https://clinicaltrials.gov/polyfills-6ISPNSXF.js/polyfills-6ISPNSXF.js https://clinicaltrials.gov/polyfills-6ISPNSXF.js — 200 — 12.5 KiB — 227 ms — h2https://clinicaltrials.gov/scripts-2KLTL4Y7.js/scripts-2KLTL4Y7.js https://clinicaltrials.gov/scripts-2KLTL4Y7.js — 200 — 29.0 KiB — 265 ms — h2https://clinicaltrials.gov/main-CVYC5WO6.js/main-CVYC5WO6.js https://clinicaltrials.gov/main-CVYC5WO6.js — 200 — 29.5 KiB — 242 ms — h2https://clinicaltrials.gov/assets/images/glossary-panel/open-glossary-drawer.svg/assets/images/glossary-panel/open-... https://clinicaltrials.gov/assets/images/glossary-panel/open-glossary-drawer.svg — 200 — 0 B — 143 ms — h2https://clinicaltrials.gov/assets/images/glossary-panel/close-glossary-drawer.svg/assets/images/glossary-panel/close... https://clinicaltrials.gov/assets/images/glossary-panel/close-glossary-drawer.svg — 200 — 0 B — 143 ms — h2https://clinicaltrials.gov/assets/uswds/img/usa-icons/search.svg/assets/uswds/img/usa-icons/search.... https://clinicaltrials.gov/assets/uswds/img/usa-icons/search.svg — 200 — 300 B — 154 ms — h2https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2fonts.gstatic.com/s/roboto/v51/KFO7... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2 — 200 — 42.2 KiB — 27 ms — h3https://www.googletagmanager.com/gtm.js?id=GTM-PC9B6M3&l=pingerDataLayerwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-PC9B6M3&l=pingerDataLayer — 200 — 129.9 KiB — 249 ms — h2https://clinicaltrials.gov/chunk-KN7AZEOJ.js/chunk-KN7AZEOJ.js https://clinicaltrials.gov/chunk-KN7AZEOJ.js — 200 — 4.3 KiB — 136 ms — h2https://clinicaltrials.gov/chunk-PW3IYSAL.js/chunk-PW3IYSAL.js https://clinicaltrials.gov/chunk-PW3IYSAL.js — 200 — 1.0 KiB — 146 ms — h2https://clinicaltrials.gov/chunk-7Z3OISSX.js/chunk-7Z3OISSX.js https://clinicaltrials.gov/chunk-7Z3OISSX.js — 200 — 988 B — 140 ms — h2https://clinicaltrials.gov/chunk-PVALZXTS.js/chunk-PVALZXTS.js https://clinicaltrials.gov/chunk-PVALZXTS.js — 200 — 5.0 KiB — 147 ms — h2https://clinicaltrials.gov/chunk-3DDGAPOV.js/chunk-3DDGAPOV.js https://clinicaltrials.gov/chunk-3DDGAPOV.js — 200 — 1.1 KiB — 149 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 740 ms LCP 2.3 shttps://clinicaltrials.gov// https://clinicaltrials.gov/ — 200 — 14.6 KiB — 223 ms — h2https://clinicaltrials.gov/styles-K5ERNWXN.css/styles-K5ERNWXN.css https://clinicaltrials.gov/styles-K5ERNWXN.css — 200 — 100.5 KiB — 401 ms — h2https://clinicaltrials.gov/assets/images/glossary-panel/open-glossary-drawer.svg/assets/images/glossary-panel/open-... https://clinicaltrials.gov/assets/images/glossary-panel/open-glossary-drawer.svg — 200 — 4.6 KiB — 146 ms — h2https://clinicaltrials.gov/assets/images/glossary-panel/glossary-icon.svg/assets/images/glossary-panel/gloss... https://clinicaltrials.gov/assets/images/glossary-panel/glossary-icon.svg — 200 — 783 B — 135 ms — h2https://clinicaltrials.gov/assets/images/glossary-panel/close-glossary-drawer.svg/assets/images/glossary-panel/close... https://clinicaltrials.gov/assets/images/glossary-panel/close-glossary-drawer.svg — 200 — 4.6 KiB — 142 ms — h2https://clinicaltrials.gov/assets/uswds/img/sprite.svg/assets/uswds/img/sprite.svg https://clinicaltrials.gov/assets/uswds/img/sprite.svg — 200 — 22.1 KiB — 148 ms — h2https://cdn.ncbi.nlm.nih.gov/core/pinger/pinger.jscdn.ncbi.nlm.nih.gov/core/pinger/pi... https://cdn.ncbi.nlm.nih.gov/core/pinger/pinger.js — 200 — 29.7 KiB — 26 ms — h2https://clinicaltrials.gov/chunk-CSFWWYAD.js/chunk-CSFWWYAD.js https://clinicaltrials.gov/chunk-CSFWWYAD.js — 200 — 1.8 KiB — 138 ms — h2https://clinicaltrials.gov/chunk-4RLMJJU6.js/chunk-4RLMJJU6.js https://clinicaltrials.gov/chunk-4RLMJJU6.js — 200 — 3.4 KiB — 135 ms — h2https://clinicaltrials.gov/chunk-A4TKQV37.js/chunk-A4TKQV37.js https://clinicaltrials.gov/chunk-A4TKQV37.js — 200 — 19.5 KiB — 197 ms — h2https://clinicaltrials.gov/chunk-PQ7UAPLD.js/chunk-PQ7UAPLD.js https://clinicaltrials.gov/chunk-PQ7UAPLD.js — 200 — 25.5 KiB — 251 ms — h2https://clinicaltrials.gov/chunk-6K3D2Y6T.js/chunk-6K3D2Y6T.js https://clinicaltrials.gov/chunk-6K3D2Y6T.js — 200 — 3.9 KiB — 162 ms — h2https://clinicaltrials.gov/chunk-IIYQDVVA.js/chunk-IIYQDVVA.js https://clinicaltrials.gov/chunk-IIYQDVVA.js — 200 — 15.1 KiB — 188 ms — h2https://clinicaltrials.gov/chunk-KX25CUXS.js/chunk-KX25CUXS.js https://clinicaltrials.gov/chunk-KX25CUXS.js — 200 — 1.2 KiB — 151 ms — h2https://clinicaltrials.gov/chunk-CET22XHF.js/chunk-CET22XHF.js https://clinicaltrials.gov/chunk-CET22XHF.js — 200 — 1.7 KiB — 149 ms — h2https://clinicaltrials.gov/chunk-ZTDDVPAW.js/chunk-ZTDDVPAW.js https://clinicaltrials.gov/chunk-ZTDDVPAW.js — 200 — 2.5 KiB — 215 ms — h2https://clinicaltrials.gov/chunk-EQYVI5PP.js/chunk-EQYVI5PP.js https://clinicaltrials.gov/chunk-EQYVI5PP.js — 200 — 1.4 KiB — 205 ms — h2https://clinicaltrials.gov/polyfills-6ISPNSXF.js/polyfills-6ISPNSXF.js https://clinicaltrials.gov/polyfills-6ISPNSXF.js — 200 — 12.5 KiB — 227 ms — h2https://clinicaltrials.gov/scripts-2KLTL4Y7.js/scripts-2KLTL4Y7.js https://clinicaltrials.gov/scripts-2KLTL4Y7.js — 200 — 29.0 KiB — 265 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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
38% of JavaScript execution is third-party
First-party Third-party 414ms · 425KB · €4/mo
Unattributable
Other
Costly
Execution 213ms
Transfer 0 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 73ms
Transfer 148 KB
Unused 42%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 73ms
Transfer 147 KB
Unused 42%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 55ms
Transfer 130 KB
Unused 47%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 213ms and costs ~€2/month

Unattributable takes 213ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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