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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
3
REVIEW
3
PASS
9
INFO
2

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

Mobile Desktop
40
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
82
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.
82
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.

3.11 s

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

36.69 s

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

891 ms

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

0.005

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

12.40 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.

37.18 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
9 PASS 3 REVIEW 3 FIX
F
Page Weight Budget
Action
7.0 MB transferred, 73 requests
FIX
7.0 MB transferred, 73 requests
Critical::
Page weighs 9.0 MB (7.0 MB transferred)
Warning::
Images are 6.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 6.2 MB
Warning::
JavaScript is 570 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 570 KB
Info::
73 HTTP requests
Info::
Estimated 1.5 g CO2 per page load
7.0 MB / 2.4 MB budget
7.0 MB transferred
73 requests
1.5 g CO2 per page load
Images 6.2 MiB 89%
JavaScript 570.1 KiB 8%
CSS 161.8 KiB 2%
Fonts 51.2 KiB 1%
HTML 25.5 KiB 0%
Other 5.3 KiB 0%
Other 1.3 KiB 0%
Other 551 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

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

F
JS Execution Cost
Action
3501ms total JS execution
FIX
3501ms total JS execution
Warning::
https://www.jneurosci.org/sites/default/files/adva...: 1115ms CPU time
Warning::
Unattributable: 469ms CPU time
Warning::
https://www.jneurosci.org/: 464ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-FL7D...: 414ms CPU time
Warning::
https://cdn.foxycart.com/sn.ecommerce.highwire.org...: 402ms CPU time
Warning::
Third-party scripts: 1922ms (55% of total)

Main Thread Breakdown

Script Evaluation 46% Other 19% Style & Layout 17% Script Parsing & Compilation 9% Parse HTML & CSS 7%
ScriptTotalScriptingParse/CompileParty
https://www.jneurosci.org/sites/default/files/advagg_js/js__l1Zqf64UYF4ATbLwTkia2CKjs6C6b2YuWlA_86TOZ6o__P7ikZQCl3Wc1SK729IaTbMfaE9iDcyOLlTFArVvei0E__jkPqOciu-GpwuryVSHt0rOTFoTTNbRLwYPk80PSVXP8.js1115ms501ms37ms1st
Unattributable469ms10ms0ms3rd
https://www.jneurosci.org/464ms20ms13ms1st
https://www.googletagmanager.com/gtag/js?id=G-FL7DMQSCNT&cx=c&gtm=4e64k1h2414ms321ms86ms3rd
https://cdn.foxycart.com/sn.ecommerce.highwire.org/foxycart.jsonp.sidecart.min.1776800679.js402ms326ms75ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T845VD6218ms157ms58ms3rd
https://www.googleadservices.com/pagead/conversion.js129ms118ms10ms3rd
https://assets.adobedtm.com/175f7caa2b90/f691299e04ac/launch-46c1ed716cb0.min.js100ms79ms11ms3rd
https://servedbyadbutler.com/app.js68ms37ms12ms3rd
https://cdn.foxycart.com/sn.ecommerce.highwire.org/responsive_styles.1724442605.css67ms0ms0ms3rd

Showing top 10 of 11 scripts

D
JS Bundles
Action
22 scripts, 192 KB unused
FIX
22 scripts, 192 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-FL7D...: 67 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-T84...: 65 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.foxycart.com/sn.ecommerce.highwire.org...: 34 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.jneurosci.org/sites/default/files/adva...: 26 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.jneurosci.org/sites/default/files/adva...: unminified — 13 KB could be saved
Warning::
https://www.jneurosci.org/sites/default/files/adva...: unminified — 3 KB could be saved
Info::
Total unused JavaScript: 192 KB
192 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-FL7DMQSCNT&cx=c&gtm=4e64k1h2156 KB67 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T845VD6117 KB65 KB (55%)✓3rd
https://cdn.foxycart.com/sn.ecommerce.highwire.org/foxycart.jsonp.sidecart.min.1776800679.js93 KB34 KB (37%)✓3rd
https://www.jneurosci.org/sites/default/files/advagg_js/js__l1Zqf64UYF4ATbLwTkia2CKjs6C6b2YuWlA_86TOZ6o__P7ikZQCl3Wc1SK729IaTbMfaE9iDcyOLlTFArVvei0E__jkPqOciu-GpwuryVSHt0rOTFoTTNbRLwYPk80PSVXP8.js68 KB26 KB (38%)✗1st
https://www.jneurosci.org/sites/default/files/advagg_js/js__Jd5dsvNznZMdglFu8sSni1wCsUfzvQbApHPAZwt5TY4__65Mqa1DMRwcSvPxjJEn6BXgMm-ckF3oOvkUTG9HRADI__jkPqOciu-GpwuryVSHt0rOTFoTTNbRLwYPk80PSVXP8.js5 KB—✗1st
https://googleads.g.doubleclick.net/pagead/viewthroughconversion/952157035/?random=1776895623079&cv=9&fst=1776895623079&num=1&guid=ON&resp=GooglemKTybQhCsO&eid=375603260%2C466465925%2C512247838%2C658953496&u_h=823&u_w=412&ig=1&frm=0&url=https%3A%2F%2Fwww.jneurosci.org%2F&tiba=Journal%20of%20Neuroscience&hn=www.googleadservices.com&rfmt=3&fmt=40 KB—✓3rd
https://www.jneurosci.org/sites/default/files/advagg_js/js__GM3GJPR36rRIz0TRkjC5OQwrioSyN9aoYRivDhCO_AM__qAl84FcCv2jyN22yFGS5Oc85cjd9zKX6p_cFNLGhe-M__jkPqOciu-GpwuryVSHt0rOTFoTTNbRLwYPk80PSVXP8.js4 KB—✓1st
https://assets.adobedtm.com/175f7caa2b90/f691299e04ac/launch-46c1ed716cb0.min.js19 KB—✓3rd
https://cdn.foxycart.com/sn.ecommerce.highwire.org/loader.js1 KB—✓3rd
https://cdn.pbgrd.com/core-sfn.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

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
Image Optimization
Action
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Warning::
https://servedbyadbutler.com/getad.img/;libID=5312... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.jneurosci.org/sites/default/files/mobi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.jneurosci.org/sites/default/files/styl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
23 images 6.2 MB
0 oversized -0 KB
23 legacy format
3 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

C
Page Weight Inventory
Action
73 resources · 7.0 MB · 192 KB savings available
REVIEW
73 resources · 7.0 MB · 192 KB savings available
Warning::
Page weight 6.0 MB over 1MB target
Got: 7.0 MB Expected: ≤ 1 MB
Info::
~192 KB of savings available
Info::
42 third-party resources (35% of weight)
Info::
2 resources over 200KB
73 resources · 7.0 MiB · 42 third-party 6.0 MiB over 1MB target
Image 89% · 6.2 MiB
JavaScript 8% · 570.1 KiB
CSS 2% · 161.8 KiB
Font 1% · 51.2 KiB
Document 0% · 27.2 KiB
Other 0% · 1.1 KiB

~191.8 KiB of savings available

Remove unused JavaScript: 191.8 KiB
B
HTTP Caching
public, max-age=0, must-revalidate, proxy-revalidate, pre-check=0, post-check=0
REVIEW
public, max-age=0, must-revalidate, proxy-revalidate, pre-check=0, post-check=0
Info::
Cache-Control header is set
Got: public, max-age=0, must-revalidate, proxy-revalidate, pre-check=0, post-check=0
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

public, max-age=0, must-revalidate, proxy-revalidate, pre-check=0, post-check=0

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
proxy-revalidate—
pre-check0
post-check0
A
Third-Party Impact
35% third-party, 0 ms blocking
PASS
35% third-party, 0 ms blocking
Info::
Third-party code accounts for 35% of page weight (2.4 MiB of 7.0 MiB)
Info::
Third-party blocking time is low (0 ms)
65%
35%
First-party Third-party
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
3 fonts (51 KB)
PASS
3 fonts (51 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

51 KB total

Render-blocking

0

of 3

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 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s FCP 3.1 s LCP 36.7 shttps://www.jneurosci.org/sites/all/themes/highwire/jcore_1/font/fontawesome-webfont.woff?v=3.2.1fontawesome-webfont.woff https://www.jneurosci.org/sites/all/themes/highwire/jcore_1/font/fontawesome-webfont.woff?v=3.2.1 — 42.7 KiB — 44 ms — font-display: swaphttps://www.jneurosci.org/sites/default/modules/jnl_eneuro_styles/fonts/icomoon.ttf?bhlms2icomoon.ttf https://www.jneurosci.org/sites/default/modules/jnl_eneuro_styles/fonts/icomoon.ttf?bhlms2 — 1.8 KiB — 40 ms — font-display: swaphttps://www.jneurosci.org/sites/all/modules/highwire/highwire/highwire_theme_tools/fonts/hwicons.ttf?bx11alhwicons.ttf https://www.jneurosci.org/sites/all/modules/highwire/highwire/highwire_theme_tools/fonts/hwicons.ttf?bx11al — 6.7 KiB — 44 ms — font-display: swap
fontawesome-webfont.woff unknown swap
Size 43 KB
Load time 44 ms
Start 830 ms
Risk FOUT — text flashes from fallback to web font
icomoon.ttf ttf swap
Size 2 KB
Load time 40 ms
Start 831 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
hwicons.ttf ttf swap
Size 7 KB
Load time 44 ms
Start 832 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~15 KB and ~30 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
73 requests over 2467ms
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 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s FCP 3.1 s LCP 36.7 shttps://www.jneurosci.org// https://www.jneurosci.org/ — 200 — 19.1 KiB — 275 ms — h2https://www.jneurosci.org/sites/default/files/advagg_css/css__BJ6Ou6QsBRtnFTmxaakamOIS8n4QswDP2XnnZ1sxtaM__NBuvkP6eInGIkb1aJvUHx5PX79XApuxBDkk_77W5tYk__jkPqOciu-GpwuryVSHt0rOTFoTTNbRLwYPk80PSVXP8.css/sites/default/files/advagg_css/css... https://www.jneurosci.org/sites/default/files/advagg_css/css__BJ6Ou6QsBRtnFTmxaakamOIS8n4QswDP2XnnZ1sxtaM__NBuvkP6eInGIkb1aJvUHx5PX79XApuxBDkk_77W5tYk__jkPqOciu-GpwuryVSHt0rOTFoTTNbRLwYPk80PSVXP8.css — 200 — 2.3 KiB — 66 ms — h2https://www.jneurosci.org/sites/default/files/advagg_css/css__h8vL9XqZbR5p6fBA2D0scfV1qft6lIgY_4kzR5vHhPY__TUo9Mv_NYjK3hnPhdYYCgMhxSYMgi7y-CuoR5Hkzl4o__jkPqOciu-GpwuryVSHt0rOTFoTTNbRLwYPk80PSVXP8.css/sites/default/files/advagg_css/css... https://www.jneurosci.org/sites/default/files/advagg_css/css__h8vL9XqZbR5p6fBA2D0scfV1qft6lIgY_4kzR5vHhPY__TUo9Mv_NYjK3hnPhdYYCgMhxSYMgi7y-CuoR5Hkzl4o__jkPqOciu-GpwuryVSHt0rOTFoTTNbRLwYPk80PSVXP8.css — 200 — 281 B — 89 ms — h2https://www.jneurosci.org/sites/default/files/advagg_css/css__MyyoQ8EhFK96FZB2z8ygRU8lhqckLK08DNTYN3u6Dhs__MdiKrh9-slcZuJDDkKNsCRvZlIZcrUuzrG4gZLOsoPk__jkPqOciu-GpwuryVSHt0rOTFoTTNbRLwYPk80PSVXP8.css/sites/default/files/advagg_css/css... https://www.jneurosci.org/sites/default/files/advagg_css/css__MyyoQ8EhFK96FZB2z8ygRU8lhqckLK08DNTYN3u6Dhs__MdiKrh9-slcZuJDDkKNsCRvZlIZcrUuzrG4gZLOsoPk__jkPqOciu-GpwuryVSHt0rOTFoTTNbRLwYPk80PSVXP8.css — 200 — 9.4 KiB — 233 ms — h2https://www.jneurosci.org/sites/default/files/advagg_css/css__npCWuMMhP4xBg4iyVjpnScKc0Zzf6fDT4X8sGS8ZDQA__QmKaoQaq8xBZbk9uwhMU262D5RagOkfQVPEQVi2ROvU__jkPqOciu-GpwuryVSHt0rOTFoTTNbRLwYPk80PSVXP8.css/sites/default/files/advagg_css/css... https://www.jneurosci.org/sites/default/files/advagg_css/css__npCWuMMhP4xBg4iyVjpnScKc0Zzf6fDT4X8sGS8ZDQA__QmKaoQaq8xBZbk9uwhMU262D5RagOkfQVPEQVi2ROvU__jkPqOciu-GpwuryVSHt0rOTFoTTNbRLwYPk80PSVXP8.css — 200 — 690 B — 71 ms — h2https://cdn.jsdelivr.net/qtip2/2.2.1/jquery.qtip.min.csscdn.jsdelivr.net/qtip2/2.2.1/jquery... https://cdn.jsdelivr.net/qtip2/2.2.1/jquery.qtip.min.css — 200 — 2.9 KiB — 32 ms — h2https://www.jneurosci.org/sites/default/files/advagg_css/css__7CYEtfDxMu3CEBZ53TQrEfMpO7duR_XdIuTLye9W7Cc__ch0nTQ-B6KQiyE_IFPpOAVQrK9gfcTwAO6_C24XWZVk__jkPqOciu-GpwuryVSHt0rOTFoTTNbRLwYPk80PSVXP8.css/sites/default/files/advagg_css/css... https://www.jneurosci.org/sites/default/files/advagg_css/css__7CYEtfDxMu3CEBZ53TQrEfMpO7duR_XdIuTLye9W7Cc__ch0nTQ-B6KQiyE_IFPpOAVQrK9gfcTwAO6_C24XWZVk__jkPqOciu-GpwuryVSHt0rOTFoTTNbRLwYPk80PSVXP8.css — 200 — 2.0 KiB — 84 ms — h2https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6.7.2/css/all.min.csscdn.jsdelivr.net/npm/@fortawesome/f... https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6.7.2/css/all.min.css — 200 — 22.1 KiB — 39 ms — h2https://www.jneurosci.org/sites/default/files/advagg_css/css__vP96nkAt3EeLU62QRdHXKZuS9tqQ1EMDJC_PSKd7hEk__-QNIdNeGmHVz1SZAaU0zPbKgZqousY6M-qJrXXnrKKA__jkPqOciu-GpwuryVSHt0rOTFoTTNbRLwYPk80PSVXP8.css/sites/default/files/advagg_css/css... https://www.jneurosci.org/sites/default/files/advagg_css/css__vP96nkAt3EeLU62QRdHXKZuS9tqQ1EMDJC_PSKd7hEk__-QNIdNeGmHVz1SZAaU0zPbKgZqousY6M-qJrXXnrKKA__jkPqOciu-GpwuryVSHt0rOTFoTTNbRLwYPk80PSVXP8.css — 200 — 18.6 KiB — 90 ms — h2https://www.jneurosci.org/sites/default/files/advagg_css/css__8_Q3_qqSooNsJt05ZZqeDoBEbwbPyjlwtDOJ7tJX8Io__vg6O8jrR3qqyXB-PeTxGHSstfTuUxKRftF8_yAnjg6k__jkPqOciu-GpwuryVSHt0rOTFoTTNbRLwYPk80PSVXP8.css/sites/default/files/advagg_css/css... 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h3https://neurojobs.sfn.org/getasset/86af67a6-5210-495b-aa38-d77548627aae/neurojobs.sfn.org/getasset/86af67a6... https://neurojobs.sfn.org/getasset/86af67a6-5210-495b-aa38-d77548627aae/ — 200 — 19.0 KiB — 43 ms — h3https://cdn.foxycart.com/sn.ecommerce.highwire.org/foxycart.jsonp.sidecart.min.1776800679.jscdn.foxycart.com/sn.ecommerce.highw... https://cdn.foxycart.com/sn.ecommerce.highwire.org/foxycart.jsonp.sidecart.min.1776800679.js — 200 — 93.4 KiB — 18 ms — h2https://cdn.foxycart.com/sn.ecommerce.highwire.org/responsive_styles.1724442605.csscdn.foxycart.com/sn.ecommerce.highw... https://cdn.foxycart.com/sn.ecommerce.highwire.org/responsive_styles.1724442605.css — 200 — 74.4 KiB — 19 ms — h2https://www.jneurosci.org/sites/default/files/images/favicon.ico/sites/default/files/images/favicon... https://www.jneurosci.org/sites/default/files/images/favicon.ico — 200 — 4.4 KiB — 41 ms — h2https://sn.ecommerce.highwire.org/cart?cart=get&callback=jQuery18208536596983878797_1776895623000&output=json&_=1776895624227sn.ecommerce.highwire.org/cart?cart... https://sn.ecommerce.highwire.org/cart?cart=get&callback=jQuery18208536596983878797_1776895623000&output=json&_=1776895624227 — 200 — 1.8 KiB — 249 ms — h2https://servedbyadbutler.com/adserve/;MID=183357;type=v959fb862;placementID=3624642;setID=540736;channelID=0;CID=0;BID=524546419;TAID=0;place=0;rnd=9028911;referrer=https%3A%2F%2Fwww.jneurosci.org%2F;request_uuid=393eb173-8729-4213-9140-625566a1b48a;mt=1776895623316253;hc=37034eff890edc516a4529e75a43d14d3815419aservedbyadbutler.com/adserve/;MID=1... https://servedbyadbutler.com/adserve/;MID=183357;type=v959fb862;placementID=3624642;setID=540736;channelID=0;CID=0;BID=524546419;TAID=0;place=0;rnd=9028911;referrer=https%3A%2F%2Fwww.jneurosci.org%2F;request_uuid=393eb173-8729-4213-9140-625566a1b48a;mt=1776895623316253;hc=37034eff890edc516a4529e75a43d14d3815419a — 200 — 231 B — 15 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
55% of JavaScript execution is third-party
First-party Third-party 1922ms · 516KB · $26/mo
Unattributable
Other
Costly
Execution 469ms
Transfer 0 KB
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 414ms
Transfer 156 KB
Unused 43%
Monthly Cost $5/mo
cdn.foxycart.com
Other
Costly
Execution 402ms
Transfer 93 KB
Unused 37%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 218ms
Transfer 117 KB
Unused 55%
Monthly Cost $3/mo
Google Ads Conversion
Advertising
Optional
Execution 129ms
Transfer 24 KB
Monthly Cost $2/mo
assets.adobedtm.com
Other
Optional
Execution 100ms
Transfer 19 KB
Monthly Cost $1/mo
servedbyadbutler.com
Other
Optional
Execution 68ms
Transfer 13 KB
Monthly Cost $1/mo
cdn.foxycart.com
Other
Optional
Execution 67ms
Transfer 74 KB
Monthly Cost $1/mo
tags.crwdcntrl.net
Other
Optional
Execution 54ms
Transfer 20 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 469ms and costs ~$6/month
  • Google Tag Manager adds 414ms and costs ~$5/month
  • cdn.foxycart.com adds 402ms and costs ~$5/month
  • Google Tag Manager adds 218ms and costs ~$3/month

55% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 469ms 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 414ms 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

cdn.foxycart.com takes 402ms 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 218ms 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

55% 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

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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