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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
4
REVIEW
1
PASS
10
INFO
2

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

Mobile Desktop
36
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.

7.07 s

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

17.88 s

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

956 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.

8.00 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.

17.99 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
10 PASS 1 REVIEW 4 FIX
F
Page Weight Budget
Action
2.9 MB transferred, 88 requests
FIX
2.9 MB transferred, 88 requests
Warning::
Page weighs 6.1 MB (2.9 MB transferred)
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 773 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 773 KB
Info::
88 HTTP requests
Info::
Estimated 0.61 g CO2 per page load
2.9 MB / 2.4 MB budget
2.9 MB transferred
88 requests
0.61 g CO2 per page load
JavaScript 1.1 MiB 37%
Images 899.2 KiB 30%
Fonts 773.5 KiB 26%
CSS 129.5 KiB 4%
HTML 25.2 KiB 1%
Other 16.4 KiB 1%
Other 9.7 KiB 0%
Other 9.5 KiB 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

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 Execution Cost
Action
3301ms total JS execution
FIX
3301ms total JS execution
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WXP...: 503ms CPU time
Warning::
https://www.googletagmanager.com/gtag/destination?...: 466ms CPU time
Warning::
Unattributable: 465ms CPU time
Warning::
https://taylorandfrancis.com/: 452ms CPU time
Warning::
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88...: 323ms CPU time
Warning::
Third-party scripts: 2463ms (75% of total)

Main Thread Breakdown

Script Evaluation 66% Other 12% Script Parsing & Compilation 9% Style & Layout 8%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtm.js?id=GTM-WXPTQPP503ms447ms47ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-11045773574&cx=c&gtm=4e64k1h2466ms400ms56ms3rd
Unattributable465ms112ms0ms3rd
https://taylorandfrancis.com/452ms55ms5ms1st
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/tcf/ui.js323ms252ms36ms3rd
https://taylorandfrancis.com/cdn-cgi/challenge-platform/scripts/jsd/main.js321ms318ms2ms1st
https://www.googletagmanager.com/gtag/destination?id=AW-16473093908&cx=c&gtm=4e64k1h2297ms249ms46ms3rd
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/airgap.js236ms194ms21ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5WV5K4GW&gtm=4e64k1h2172ms125ms44ms3rd
https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/vendors/react-dom.min.js?ver=18.3.166ms50ms15ms1st
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=4e64k1h2145 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=4e64k1h2146 KB62 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-11045773574&cx=c&gtm=4e64k1h2183 KB58 KB (32%)✓3rd
https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/vendors/react-dom.min.js?ver=18.3.144 KB37 KB (86%)✓1st
https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/blocks/index.min.js?ver=27318ac6d6f72eaf78ee56 KB35 KB (62%)✓1st
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/tcf/ui.js84 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=3f093e5cca67aa0f8b562 KB—✓1st
https://taylorandfrancis.com/wp-content/plugins/gutenberg/build/scripts/html-entities/index.min.js?ver=8c6fa5b869dfeadc4af22 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
88 resources · 2.9 MB · 389 KB savings available
FIX
88 resources · 2.9 MB · 389 KB savings available
Warning::
Page weight 1.9 MB over 1MB target
Got: 2.9 MB Expected: ≤ 1 MB
Info::
~389 KB of savings available
Info::
20 third-party resources (28% of weight)
Info::
3 resources over 200KB
88 resources · 2.9 MiB · 20 third-party 1.9 MiB over 1MB target
JavaScript 37% · 1.1 MiB
Image 30% · 908.7 KiB
Font 26% · 773.5 KiB
CSS 4% · 129.5 KiB
Other 1% · 26.0 KiB
Document 1% · 25.2 KiB

~389.0 KiB of savings available

Remove unused JavaScript: 389.0 KiB
B
Image Optimization
10 images, 0 KB saveable
REVIEW
10 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.
10 images 899 KB
0 oversized -0 KB
10 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

A
Third-Party Impact
28% third-party, 0 ms blocking
PASS
28% third-party, 0 ms blocking
Info::
Third-party code accounts for 28% of page weight (830.2 KiB of 2.9 MiB)
Info::
Third-party blocking time is low (0 ms)
72%
28%
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 (773 KB)
PASS
7 fonts (773 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

773 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 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 FCP 7.1 s LCP 17.9 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 — 18.2 KiB — 88 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 — 16.2 KiB — 102 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 — 17.1 KiB — 106 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 — 17.7 KiB — 107 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 — 260.0 KiB — 135 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 — 334.7 KiB — 86 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 — 109.6 KiB — 93 ms — font-display: swap
open-sans-v34-latin-reg... woff2 swap
Size 18 KB
Load time 88 ms
Start 407 ms
Risk FOUT — text flashes from fallback to web font
open-sans-v34-latin-700... woff2 swap
Size 16 KB
Load time 102 ms
Start 407 ms
Risk FOUT — text flashes from fallback to web font
open-sans-v34-latin-700... woff2 swap
Size 17 KB
Load time 106 ms
Start 407 ms
Risk FOUT — text flashes from fallback to web font
open-sans-v34-latin-ita... woff2 swap
Size 18 KB
Load time 107 ms
Start 407 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 260 KB
Load time 135 ms
Start 608 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 86 ms
Start 609 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 110 KB
Load time 93 ms
Start 609 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+
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

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
88 requests over 2792ms
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 FCP 7.1 s LCP 17.9 shttps://taylorandfrancis.com// https://taylorandfrancis.com/ — 200 — 25.2 KiB — 128 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 — 23.4 KiB — 113 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 — 4.9 KiB — 113 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 — 18.5 KiB — 90 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 — 32.6 KiB — 116 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 — 125 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 — 153 ms — h3https://taylorandfrancis.com/wp-content/uploads/2026/01/multicolour-paint-brain-768x455.jpg/wp-content/uploads/2026/01/multico... https://taylorandfrancis.com/wp-content/uploads/2026/01/multicolour-paint-brain-768x455.jpg — 200 — 102.9 KiB — 128 ms — h2https://taylorandfrancis.com/wp-content/uploads/2026/01/woman-using-tablet-in-a-data-center-768x455.jpg/wp-content/uploads/2026/01/woman-u... https://taylorandfrancis.com/wp-content/uploads/2026/01/woman-using-tablet-in-a-data-center-768x455.jpg — 200 — 65.9 KiB — 124 ms — h2https://taylorandfrancis.com/wp-content/uploads/2026/01/universidad-nacional-autonoma-de-mexico-768x455.jpg/wp-content/uploads/2026/01/univers... https://taylorandfrancis.com/wp-content/uploads/2026/01/universidad-nacional-autonoma-de-mexico-768x455.jpg — 200 — 104.1 KiB — 109 ms — h2https://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 — 3.1 KiB — 90 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 — 23.8 KiB — 85 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 — 64 ms — h3https://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 — 12.1 KiB — 119 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 — 2.9 KiB — 110 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 — 765 B — 107 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 — 2.1 KiB — 91 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 — 2.6 KiB — 98 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 — 91 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 — 43.5 KiB — 129 ms — 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https://region1.google-analytics.com/g/collect?v=2&tid=G-4VFNVXBRVQ&gtm=45be64k1h2v883995813z8812851530za20gzb812851530zd812851530&_p=1776887955836&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&tcfd=10001&_eu=EA&are=1&cid=726484340.1776887958&frm=0&ir=1&pscdl=denied&rcb=14&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266400~117512542&sid=1776887958&sct=1&seg=0&dl=https%3A%2F%2Ftaylorandfrancis.com%2F&dt=Taylor%20%26%20Francis%20-%20Fostering%20human%20progress%20through%20knowledge&en=page_view&_fv=1&_ss=1&gap.plf=5&ep.custom_hostname=taylorandfrancis.com&ep.gtm_container_id=GTM-WXPTQPP&ep.gtm_container_version=48&up.GA_client_id=_&tfd=2723 — 204 — 48 B — 68 ms — h2https://pagead2.googlesyndication.com/ccm/collect?rcb=14&frm=0&en=page_view&dl=https%3A%2F%2Ftaylorandfrancis.com%2F&scrsrc=www.googletagmanager.com&rnd=324200926.1776887956&navt=n&npa=1&ep.custom_hostname=taylorandfrancis.com&ep.gtm_container_id=GTM-WXPTQPP&ep.gtm_container_version=48&gtm=45be64k1h2v883995813z8812851530za20gzb812851530zd812851530xec&gcs=G100&gcd=13p3pPp2p5l1&dma_cps=-&dma=1&tcfd=10001&tag_exp=0~115616985~115938466~115938468~117266400~117512542&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=1776887958214&tfd=2724pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=14&frm=0&en=page_view&dl=https%3A%2F%2Ftaylorandfrancis.com%2F&scrsrc=www.googletagmanager.com&rnd=324200926.1776887956&navt=n&npa=1&ep.custom_hostname=taylorandfrancis.com&ep.gtm_container_id=GTM-WXPTQPP&ep.gtm_container_version=48&gtm=45be64k1h2v883995813z8812851530za20gzb812851530zd812851530xec&gcs=G100&gcd=13p3pPp2p5l1&dma_cps=-&dma=1&tcfd=10001&tag_exp=0~115616985~115938466~115938468~117266400~117512542&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=1776887958214&tfd=2724 — 200 — 21 B — 27 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
75% of JavaScript execution is third-party
First-party Third-party 2463ms · 795KB · $43/mo
Google Tag Manager
Tag Manager
Costly
Execution 503ms
Transfer 158 KB
Unused 41%
Monthly Cost $9/mo
Google Tag Manager
Tag Manager
Costly
Execution 466ms
Transfer 183 KB
Unused 32%
Monthly Cost $8/mo
Unattributable
Other
Costly
Execution 465ms
Transfer 0 KB
Monthly Cost $8/mo
transcend-cdn.com
Other
Costly
Execution 323ms
Transfer 84 KB
Unused 33%
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 297ms
Transfer 146 KB
Unused 42%
Monthly Cost $5/mo
transcend-cdn.com
Other
Costly
Execution 236ms
Transfer 78 KB
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Optional
Execution 172ms
Transfer 145 KB
Unused 57%
Monthly Cost $3/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 503ms and costs ~$9/month
  • Google Tag Manager adds 466ms and costs ~$8/month
  • Unattributable adds 465ms and costs ~$8/month
  • transcend-cdn.com adds 323ms and costs ~$6/month
  • Google Tag Manager adds 297ms and costs ~$5/month
  • transcend-cdn.com adds 236ms and costs ~$4/month

75% 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

Google Tag Manager takes 503ms 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 466ms 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 465ms 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

transcend-cdn.com takes 323ms 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 297ms 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

transcend-cdn.com takes 236ms 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

57% 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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