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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
3
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
77
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

724 ms

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

2.15 s

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

40 ms

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

0.226

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

1.21 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.

2.28 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
8 PASS 2 REVIEW 3 FIX
F
Page Weight Budget
Action
3.1 MB transferred, 89 requests
FIX
3.1 MB transferred, 89 requests
Warning::
Page weighs 6.3 MB (3.1 MB transferred)
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
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
Fonts are 775 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 775 KB
Info::
89 HTTP requests
Info::
Estimated 0.66 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
89 requests
0.66 g CO2 per page load
Images 1.1 MiB 35%
JavaScript 1.1 MiB 35%
Fonts 775.1 KiB 24%
CSS 127.6 KiB 4%
HTML 25.5 KiB 1%
Other 16.6 KiB 1%
Other 9.7 KiB 0%
Other 9.5 KiB 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

D
JS Bundles
Action
45 scripts, 389 KB unused
FIX
45 scripts, 389 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5WV...: 83 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WXP...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 62 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 58 KB unused (32%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://taylorandfrancis.com/wp-content/plugins/gu...: 37 KB unused (86%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 389 KB
389 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-5WV5K4GW&gtm=4e64k0145 KB83 KB (57%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WXPTQPP158 KB65 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-16473093908&cx=c&gtm=4e64k0146 KB62 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-11045773574&cx=c&gtm=4e64k0183 KB58 KB (32%)✓3rd
https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/vendors/react-dom.min.js?ver=18.3.143 KB37 KB (86%)✓1st
https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/blocks/index.min.js?ver=27318ac6d6f72eaf78ee58 KB35 KB (62%)✓1st
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/tcf/ui.js85 KB27 KB (33%)✓3rd
https://taylorandfrancis.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.131 KB22 KB (72%)✓1st
https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/escape-html/index.min.js?ver=3f093e5cca67aa0f8b561 KB—✓1st
https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/html-entities/index.min.js?ver=8c6fa5b869dfeadc4af21 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

D
Page Weight Inventory
Action
89 resources · 3.1 MB · 389 KB savings available
FIX
89 resources · 3.1 MB · 389 KB savings available
Warning::
Page weight 2.1 MB over 1MB target
Got: 3.1 MB Expected: ≤ 1 MB
Info::
~389 KB of savings available
Info::
20 third-party resources (26% of weight)
Info::
4 resources over 200KB
89 resources · 3.1 MiB · 20 third-party 2.1 MiB over 1MB target
Image 35% · 1.1 MiB
JavaScript 35% · 1.1 MiB
Font 24% · 775.1 KiB
CSS 4% · 127.6 KiB
Other 1% · 26.2 KiB
Document 1% · 25.5 KiB

~388.8 KiB of savings available

Remove unused JavaScript: 388.8 KiB
B
Image Optimization
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Warning::
https://taylorandfrancis.com/wp-content/themes/JTF... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
11 images 1.1 MB
0 oversized -0 KB
11 legacy format
1 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

B
JS Execution Cost
768ms total JS execution
REVIEW
768ms total JS execution
Info::
https://taylorandfrancis.com/: 158ms CPU time
Info::
Unattributable: 150ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-WXP...: 119ms CPU time
Info::
https://www.googletagmanager.com/gtag/destination?...: 93ms CPU time
Info::
https://taylorandfrancis.com/cdn-cgi/challenge-pla...: 80ms CPU time
Warning::
Third-party scripts: 530ms (69% of total)

Main Thread Breakdown

Script Evaluation 59% Other 16% Style & Layout 10% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://taylorandfrancis.com/158ms15ms1ms1st
Unattributable150ms32ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WXPTQPP119ms107ms10ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-11045773574&cx=c&gtm=4e64k093ms81ms11ms3rd
https://taylorandfrancis.com/cdn-cgi/challenge-platform/scripts/jsd/main.js80ms67ms1ms1st
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/airgap.js64ms52ms6ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-16473093908&cx=c&gtm=4e64k052ms44ms7ms3rd
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/tcf/ui.js52ms40ms7ms3rd
A
Third-Party Impact
26% third-party, 0 ms blocking
PASS
26% third-party, 0 ms blocking
Info::
Third-party code accounts for 26% of page weight (830.3 KiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
74%
26%
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
7 fonts (775 KB)
PASS
7 fonts (775 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

775 KB total

Render-blocking

0

of 7

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 724 ms LCP 2.2 shttps://taylorandfrancis.com/wp-content/themes/JTF3/vendor/fonts/open-sans/open-sans-v34-latin-regular.woff2open-sans-v34-latin-reg... https://taylorandfrancis.com/wp-content/themes/JTF3/vendor/fonts/open-sans/open-sans-v34-latin-regular.woff2 — 16.4 KiB — 151 ms — font-display: swaphttps://taylorandfrancis.com/wp-content/themes/JTF3/vendor/fonts/open-sans/open-sans-v34-latin-700.woff2open-sans-v34-latin-700... https://taylorandfrancis.com/wp-content/themes/JTF3/vendor/fonts/open-sans/open-sans-v34-latin-700.woff2 — 16.1 KiB — 148 ms — font-display: swaphttps://taylorandfrancis.com/wp-content/themes/JTF3/vendor/fonts/open-sans/open-sans-v34-latin-700italic.woff2open-sans-v34-latin-700... https://taylorandfrancis.com/wp-content/themes/JTF3/vendor/fonts/open-sans/open-sans-v34-latin-700italic.woff2 — 19.0 KiB — 138 ms — font-display: swaphttps://taylorandfrancis.com/wp-content/themes/JTF3/vendor/fonts/open-sans/open-sans-v34-latin-italic.woff2open-sans-v34-latin-ita... https://taylorandfrancis.com/wp-content/themes/JTF3/vendor/fonts/open-sans/open-sans-v34-latin-italic.woff2 — 19.4 KiB — 119 ms — font-display: swaphttps://taylorandfrancis.com/wp-content/themes/JTF3/Pro/vendor/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://taylorandfrancis.com/wp-content/themes/JTF3/Pro/vendor/webfonts/fa-solid-900.woff2 — 261.9 KiB — 104 ms — font-display: swaphttps://taylorandfrancis.com/wp-content/themes/JTF3/Pro/vendor/webfonts/fa-regular-400.woff2fa-regular-400.woff2 https://taylorandfrancis.com/wp-content/themes/JTF3/Pro/vendor/webfonts/fa-regular-400.woff2 — 334.6 KiB — 115 ms — font-display: swaphttps://taylorandfrancis.com/wp-content/themes/JTF3/Pro/vendor/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://taylorandfrancis.com/wp-content/themes/JTF3/Pro/vendor/webfonts/fa-brands-400.woff2 — 107.7 KiB — 116 ms — font-display: swap
open-sans-v34-latin-reg... woff2 swap
Size 16 KB
Load time 151 ms
Start 359 ms
Risk FOUT — text flashes from fallback to web font
open-sans-v34-latin-700... woff2 swap
Size 16 KB
Load time 148 ms
Start 359 ms
Risk FOUT — text flashes from fallback to web font
open-sans-v34-latin-700... woff2 swap
Size 19 KB
Load time 138 ms
Start 359 ms
Risk FOUT — text flashes from fallback to web font
open-sans-v34-latin-ita... woff2 swap
Size 19 KB
Load time 119 ms
Start 359 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 262 KB
Load time 104 ms
Start 649 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-regular-400.woff2 woff2 swap
Size 335 KB
Load time 115 ms
Start 649 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-brands-400.woff2 woff2 swap
Size 108 KB
Load time 116 ms
Start 650 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~352 KB and ~704 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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

A
HTTP Caching
max-age=600 (10 minutes)
PASS
max-age=600 (10 minutes)
Info::
Cache-Control header is set
Got: public, max-age=600
Info::
Effective TTL: 10 minutes (max-age=600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=600

DirectiveValueMeaning
public—Any cache may store this response
max-age600Cache for 10 minutes
Effective TTL: 600 seconds
Network Waterfall
89 requests over 2810ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 724 ms LCP 2.2 shttps://taylorandfrancis.com// https://taylorandfrancis.com/ — 200 — 25.5 KiB — 124 ms — h2https://taylorandfrancis.com/wp-content/themes/JTF3/build/css/common/style.css?ver=3.41.5/wp-content/themes/JTF3/build/css/c... https://taylorandfrancis.com/wp-content/themes/JTF3/build/css/common/style.css?ver=3.41.5 — 200 — 21.8 KiB — 93 ms — h2https://taylorandfrancis.com/wp-content/themes/JTF-child-corporate/build/css/common/style.css?ver=1.0/wp-content/themes/JTF-child-corpor... https://taylorandfrancis.com/wp-content/themes/JTF-child-corporate/build/css/common/style.css?ver=1.0 — 200 — 4.7 KiB — 98 ms — h2https://taylorandfrancis.com/wp-content/themes/JTF3/build/css/theme/style.css?ver=6.9.4/wp-content/themes/JTF3/build/css/t... https://taylorandfrancis.com/wp-content/themes/JTF3/build/css/theme/style.css?ver=6.9.4 — 200 — 16.7 KiB — 105 ms — h2https://taylorandfrancis.com/wp-content/themes/JTF3/vendor/css/bootstrap.min.css?ver=3.41.5/wp-content/themes/JTF3/vendor/css/... https://taylorandfrancis.com/wp-content/themes/JTF3/vendor/css/bootstrap.min.css?ver=3.41.5 — 200 — 34.2 KiB — 88 ms — h2https://taylorandfrancis.com/wp-content/themes/JTF-child-corporate/build/css/theme/style.css?ver=1.0/wp-content/themes/JTF-child-corpor... https://taylorandfrancis.com/wp-content/themes/JTF-child-corporate/build/css/theme/style.css?ver=1.0 — 200 — 6.1 KiB — 81 ms — h2https://taylorandfrancis.com/wp-content/themes/JTF3/build/js/theme/scripts.min.js?ver=3.41.5/wp-content/themes/JTF3/build/js/th... https://taylorandfrancis.com/wp-content/themes/JTF3/build/js/theme/scripts.min.js?ver=3.41.5 — 200 — 17.1 KiB — 102 ms — h2https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/airgap.jstranscend-cdn.com/cm/ef49a3f1-d8c1-... https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/airgap.js — 200 — 77.7 KiB — 120 ms — h3https://taylorandfrancis.com/wp-content/uploads/2026/01/multicolour-paint-brain.jpg/wp-content/uploads/2026/01/multico... https://taylorandfrancis.com/wp-content/uploads/2026/01/multicolour-paint-brain.jpg — 200 — 178.5 KiB — 134 ms — h2https://taylorandfrancis.com/wp-content/uploads/2026/01/woman-using-tablet-in-a-data-center.jpg/wp-content/uploads/2026/01/woman-u... https://taylorandfrancis.com/wp-content/uploads/2026/01/woman-using-tablet-in-a-data-center.jpg — 200 — 105.3 KiB — 139 ms — h2https://taylorandfrancis.com/wp-content/uploads/2026/01/universidad-nacional-autonoma-de-mexico.jpg/wp-content/uploads/2026/01/univers... https://taylorandfrancis.com/wp-content/uploads/2026/01/universidad-nacional-autonoma-de-mexico.jpg — 200 — 200.3 KiB — 134 ms — h2https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/policies/GDPR.jsontranscend-cdn.com/cm/ef49a3f1-d8c1-... https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/policies/GDPR.json — 200 — 6.5 KiB — 58 ms — h3https://taylorandfrancis.com/wp-content/themes/JTF-child-corporate/build/js/theme/scripts.min.js?ver=1.0/wp-content/themes/JTF-child-corpor... https://taylorandfrancis.com/wp-content/themes/JTF-child-corporate/build/js/theme/scripts.min.js?ver=1.0 — 200 — 3.3 KiB — 79 ms — h2https://taylorandfrancis.com/wp-content/themes/JTF3/vendor/js/bootstrap.bundle.min.js?ver=3.41.5/wp-content/themes/JTF3/vendor/js/b... https://taylorandfrancis.com/wp-content/themes/JTF3/vendor/js/bootstrap.bundle.min.js?ver=3.41.5 — 200 — 25.6 KiB — 82 ms — h2https://taylorandfrancis.com/wp-includes/js/dist/vendor/wp-polyfill.min.js?ver=3.15.0/wp-includes/js/dist/vendor/wp-poly... https://taylorandfrancis.com/wp-includes/js/dist/vendor/wp-polyfill.min.js?ver=3.15.0 — 200 — 12.0 KiB — 132 ms — h2https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/vendors/react.min.js?ver=18.3.1/wp-content/plugins/gutenberg/build... https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/vendors/react.min.js?ver=18.3.1 — 200 — 3.0 KiB — 192 ms — h2https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/vendors/react-jsx-runtime.min.js?ver=18.3.1/wp-content/plugins/gutenberg/build... https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/vendors/react-jsx-runtime.min.js?ver=18.3.1 — 200 — 796 B — 118 ms — h2https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/hooks/index.min.js?ver=7496969728ca0f95732d/wp-content/plugins/gutenberg/build... https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/hooks/index.min.js?ver=7496969728ca0f95732d — 200 — 1.9 KiB — 135 ms — h2https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/deprecated/index.min.js?ver=990e85f234fee8f7d446/wp-content/plugins/gutenberg/build... https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/deprecated/index.min.js?ver=990e85f234fee8f7d446 — 200 — 852 B — 114 ms — h2https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/dom/index.min.js?ver=1acdd4ebd6969685a9d3/wp-content/plugins/gutenberg/build... https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/dom/index.min.js?ver=1acdd4ebd6969685a9d3 — 200 — 5.1 KiB — 149 ms — h2https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/vendors/react-dom.min.js?ver=18.3.1/wp-content/plugins/gutenberg/build... https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/vendors/react-dom.min.js?ver=18.3.1 — 200 — 43.4 KiB — 112 ms — h2https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/escape-html/index.min.js?ver=3f093e5cca67aa0f8b56/wp-content/plugins/gutenberg/build... 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h2https://pagead2.googlesyndication.com/ccm/collect?rcb=5&frm=0&en=page_view&dl=https%3A%2F%2Ftaylorandfrancis.com%2F&scrsrc=www.googletagmanager.com&rnd=716999884.1776887973&navt=n&npa=1&ep.custom_hostname=taylorandfrancis.com&ep.gtm_container_id=GTM-WXPTQPP&ep.gtm_container_version=48&gtm=45be64k0v883995813z8812851530za20gzb812851530zd812851530xec&gcs=G100&gcd=13p3pPp2p5l1&dma_cps=-&dma=1&tcfd=10001&tag_exp=0~115616985~115938466~115938469~117266400~117384406~117512543&apve=1&apvf=f&gap.plf=5&apvc=0&tids=AW-807664452~AW-11045773574~AW-385200824~AW-632194165~AW-660340693~AW-741299850~AW-738568660&tid=AW-807664452&tft=1776887974967&tfd=2762pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=5&frm=0&en=page_view&dl=https%3A%2F%2Ftaylorandfrancis.com%2F&scrsrc=www.googletagmanager.com&rnd=716999884.1776887973&navt=n&npa=1&ep.custom_hostname=taylorandfrancis.com&ep.gtm_container_id=GTM-WXPTQPP&ep.gtm_container_version=48&gtm=45be64k0v883995813z8812851530za20gzb812851530zd812851530xec&gcs=G100&gcd=13p3pPp2p5l1&dma_cps=-&dma=1&tcfd=10001&tag_exp=0~115616985~115938466~115938469~117266400~117384406~117512543&apve=1&apvf=f&gap.plf=5&apvc=0&tids=AW-807664452~AW-11045773574~AW-385200824~AW-632194165~AW-660340693~AW-741299850~AW-738568660&tid=AW-807664452&tft=1776887974967&tfd=2762 — 200 — 21 B — 28 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
69% of JavaScript execution is third-party
First-party Third-party 530ms · 650KB · $9/mo
Unattributable
Other
Optional
Execution 150ms
Transfer 0 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 119ms
Transfer 158 KB
Unused 41%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 93ms
Transfer 183 KB
Unused 32%
Monthly Cost $2/mo
transcend-cdn.com
Other
Optional
Execution 64ms
Transfer 78 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 52ms
Transfer 146 KB
Unused 42%
Monthly Cost $1/mo
transcend-cdn.com
Other
Optional
Execution 52ms
Transfer 85 KB
Unused 33%
Monthly Cost $1/mo

69% 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

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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