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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
35
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
86
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

4.02 s

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

13.24 s

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

1.56 s

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.

6.97 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.

17.26 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
8 PASS 1 REVIEW 6 FIX
D
Page Weight Budget
Action
2.5 MB transferred, 78 requests
FIX
2.5 MB transferred, 78 requests
Warning::
Page weighs 6.9 MB (2.5 MB transferred)
Warning::
JavaScript is 1.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.4 MB
Info::
78 HTTP requests
Info::
Estimated 0.52 g CO2 per page load
2.5 MB / 2.4 MB budget
2.5 MB transferred
78 requests
0.52 g CO2 per page load
JavaScript 1.4 MiB 57%
Images 720.3 KiB 28%
HTML 146.6 KiB 6%
Other 90.0 KiB 4%
Fonts 82.6 KiB 3%
CSS 30.6 KiB 1%
Other 10.1 KiB 0%
Other 8.9 KiB 0%
Other 5.4 KiB 0%
Other 0 B 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

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 (2.5 MiB of 2.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5313ms total JS execution
FIX
5313ms total JS execution
Warning::
https://www.taylorfrancis.com/: 1380ms CPU time
Warning::
https://www.taylorfrancis.com/main.467036cc4525a89...: 775ms CPU time
Warning::
Unattributable: 716ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0HYE...: 580ms CPU time
Warning::
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88...: 479ms CPU time
Warning::
Third-party scripts: 5313ms (100% of total)

Main Thread Breakdown

Script Evaluation 68% Other 11% Script Parsing & Compilation 9% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
https://www.taylorfrancis.com/1380ms835ms18ms3rd
https://www.taylorfrancis.com/main.467036cc4525a890d30b.js775ms486ms219ms3rd
Unattributable716ms166ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0HYE8YG0M6&cx=c&gtm=4e64h1580ms522ms52ms3rd
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/airgap.js479ms404ms23ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NSWZ4WX&gtm_auth=RdH6vmSGiXahuYVxcLqliQ&gtm_preview=env-1&gtm_cookies_win=x444ms379ms59ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5XMJVLGN&gtm=4e64h1334ms295ms31ms3rd
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/tcf/ui.js216ms176ms33ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-11468783382&cx=c&gtm=4e64h1181ms144ms36ms3rd
https://www.taylorfrancis.com/polyfills.9dd1173e3b9fbfecac89.js119ms104ms3ms3rd

Showing top 10 of 11 scripts

F
JS Bundles
Action
23 scripts, 617 KB unused
FIX
23 scripts, 617 KB unused
Warning::
https://www.taylorfrancis.com/main.467036cc4525a89...: 345 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 69 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5XM...: 62 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NSW...: 57 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0HYE...: 57 KB unused (31%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 617 KB
617 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.taylorfrancis.com/main.467036cc4525a890d30b.js582 KB345 KB (59%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-11468783382&cx=c&gtm=4e64h1146 KB69 KB (48%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5XMJVLGN&gtm=4e64h1125 KB62 KB (49%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NSWZ4WX&gtm_auth=RdH6vmSGiXahuYVxcLqliQ&gtm_preview=env-1&gtm_cookies_win=x167 KB57 KB (34%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-0HYE8YG0M6&cx=c&gtm=4e64h1183 KB57 KB (31%)✓3rd
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/tcf/ui.js85 KB27 KB (33%)✓3rd
https://js-agent.newrelic.com/async-api.30bd804e-1.236.0.min.js2 KB—✓3rd
https://js-agent.newrelic.com/page_view_event-aggregate.06482edd-1.236.0.min.js4 KB—✓3rd
https://www.taylorfrancis.com/polyfills.9dd1173e3b9fbfecac89.js13 KB—✓3rd
https://www.taylorfrancis.com/runtime.6e966365d15ffaa0ee3d.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

F
Page Weight Inventory
Action
78 resources · 2.5 MB · 617 KB savings available
FIX
78 resources · 2.5 MB · 617 KB savings available
Warning::
Page weight 1.5 MB over 1MB target
Got: 2.5 MB Expected: ≤ 1 MB
Info::
~617 KB of savings available
Warning::
77 third-party resources (100% of weight)
Info::
1 resources over 200KB
78 resources · 2.5 MiB · 77 third-party 1.5 MiB over 1MB target
JavaScript 57% · 1.4 MiB
Image 29% · 725.3 KiB
Document 6% · 155.9 KiB
Other 4% · 100.1 KiB
Font 3% · 82.6 KiB
CSS 1% · 30.6 KiB

~616.8 KiB of savings available

Remove unused JavaScript: 616.8 KiB
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
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Warning::
https://www.taylorfrancis.com/assets/images/tfgrou... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.taylorfrancis.com/wp-content/upload... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.taylorfrancis.com/wp-content/upload... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.taylorfrancis.com/assets/images/ubx.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
26 images 720 KB
0 oversized -0 KB
6 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

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
4 fonts (83 KB)
PASS
4 fonts (83 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

83 KB total

Render-blocking

0

of 4

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 FCP 4.0 s LCP 13.2 shttps://www.taylorfrancis.com/OpenSans-Regular-webfont.4f6ec530947c73b0c1dd.woff?v=1OpenSans-Regular-webfon... https://www.taylorfrancis.com/OpenSans-Regular-webfont.4f6ec530947c73b0c1dd.woff?v=1 — 23.0 KiB — 68 ms — font-display: swaphttps://www.taylorfrancis.com/OpenSans-Bold-webfont.7721ba0909593fb4c700.woff?v=1OpenSans-Bold-webfont.7... https://www.taylorfrancis.com/OpenSans-Bold-webfont.7721ba0909593fb4c700.woff?v=1 — 22.8 KiB — 66 ms — font-display: swaphttps://www.taylorfrancis.com/tf-icon-font.1c8aa49b38a468863785.ttftf-icon-font.1c8aa49b38... https://www.taylorfrancis.com/tf-icon-font.1c8aa49b38a468863785.ttf — 13.4 KiB — 143 ms — font-display: swaphttps://www.taylorfrancis.com/OpenSans-Semibold-webfont.e57adecb3a8973e1e0d7.woff?v=1OpenSans-Semibold-webfo... https://www.taylorfrancis.com/OpenSans-Semibold-webfont.e57adecb3a8973e1e0d7.woff?v=1 — 23.3 KiB — 67 ms — font-display: swap
OpenSans-Regular-webfon... woff swap
Size 23 KB
Load time 68 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
OpenSans-Bold-webfont.7... woff swap
Size 23 KB
Load time 66 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
tf-icon-font.1c8aa49b38... ttf swap
Size 13 KB
Load time 143 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
OpenSans-Semibold-webfo... woff swap
Size 23 KB
Load time 67 ms
Start 1.1 s
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 ~25 KB and ~50 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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
1
dns-prefetch
—
prefetch
—

1 resource hints configured

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
78 requests over 3994ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 4.0 s LCP 13.2 shttps://taylorfrancis.com// https://taylorfrancis.com/ — 301 — 428 B — 492 ms — h2https://www.taylorfrancis.com/www.taylorfrancis.com/ https://www.taylorfrancis.com/ — 200 — 43.2 KiB — 321 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://www.taylorfrancis.com/styles.096dfd72296b0061727a.csswww.taylorfrancis.com/styles.096dfd... https://www.taylorfrancis.com/styles.096dfd72296b0061727a.css — 200 — 27.2 KiB — 57 ms — h2https://assets.taylorfrancis.com/wp-content/uploads/2020/08/24160803/Humanities.jpgassets.taylorfrancis.com/wp-content... https://assets.taylorfrancis.com/wp-content/uploads/2020/08/24160803/Humanities.jpg — 200 — 99.0 KiB — 150 ms — h3https://assets.taylorfrancis.com/wp-content/uploads/2020/08/24155655/General-Academic-Collections_Banner-compressed.jpgassets.taylorfrancis.com/wp-content... https://assets.taylorfrancis.com/wp-content/uploads/2020/08/24155655/General-Academic-Collections_Banner-compressed.jpg — 200 — 30.1 KiB — 116 ms — h3https://www.taylorfrancis.com/runtime.6e966365d15ffaa0ee3d.jswww.taylorfrancis.com/runtime.6e966... https://www.taylorfrancis.com/runtime.6e966365d15ffaa0ee3d.js — 200 — 1.7 KiB — 59 ms — h3https://www.taylorfrancis.com/polyfills.9dd1173e3b9fbfecac89.jswww.taylorfrancis.com/polyfills.9dd... https://www.taylorfrancis.com/polyfills.9dd1173e3b9fbfecac89.js — 200 — 13.0 KiB — 72 ms — h3https://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 — 6.4 KiB — 272 ms — h3https://www.taylorfrancis.com/main.467036cc4525a890d30b.jswww.taylorfrancis.com/main.467036cc... https://www.taylorfrancis.com/main.467036cc4525a890d30b.js — 200 — 581.6 KiB — 159 ms — h3https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/tcf/ui.jstranscend-cdn.com/cm/ef49a3f1-d8c1-... https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/tcf/ui.js — 200 — 84.7 KiB — 311 ms — h3https://www.googletagmanager.com/gtm.js?id=GTM-NSWZ4WX&gtm_auth=RdH6vmSGiXahuYVxcLqliQ&gtm_preview=env-1&gtm_cookies_win=xwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-NSWZ4WX&gtm_auth=RdH6vmSGiXahuYVxcLqliQ&gtm_preview=env-1&gtm_cookies_win=x — 200 — 166.5 KiB — 166 ms — h2https://platform.twitter.com/widgets.jsplatform.twitter.com/widgets.js https://platform.twitter.com/widgets.js — 200 — 27.3 KiB — 134 ms — h2https://www.taylorfrancis.com/assets/manifest.jsonwww.taylorfrancis.com/assets/manife... https://www.taylorfrancis.com/assets/manifest.json — 404 — 8.9 KiB — 445 ms — h3https://assets.taylorfrancis.com/wp-content/uploads/2023/06/12134145/British-society.jpgassets.taylorfrancis.com/wp-content... https://assets.taylorfrancis.com/wp-content/uploads/2023/06/12134145/British-society.jpg — 200 — 8.5 KiB — 44 ms — h3https://assets.taylorfrancis.com/wp-content/uploads/2020/08/04051128/Europa-World-Banner.pngassets.taylorfrancis.com/wp-content... https://assets.taylorfrancis.com/wp-content/uploads/2020/08/04051128/Europa-World-Banner.png — 200 — 4.6 KiB — 41 ms — h3https://assets.taylorfrancis.com/wp-content/uploads/2021/10/20112849/ROM-Updated-.jpgassets.taylorfrancis.com/wp-content... https://assets.taylorfrancis.com/wp-content/uploads/2021/10/20112849/ROM-Updated-.jpg — 200 — 6.4 KiB — 57 ms — h3https://assets.taylorfrancis.com/wp-content/uploads/2020/08/29085317/ERL22DIG012-ubx-744x440-r1.jpgassets.taylorfrancis.com/wp-content... https://assets.taylorfrancis.com/wp-content/uploads/2020/08/29085317/ERL22DIG012-ubx-744x440-r1.jpg — 200 — 58.5 KiB — 59 ms — h3https://assets.taylorfrancis.com/wp-content/uploads/2020/09/01105934/Routledge_Logo.pngassets.taylorfrancis.com/wp-content... https://assets.taylorfrancis.com/wp-content/uploads/2020/09/01105934/Routledge_Logo.png — 200 — 6.0 KiB — 41 ms — h3https://assets.taylorfrancis.com/wp-content/uploads/2020/09/01105733/CRC_Press_Logo.pngassets.taylorfrancis.com/wp-content... https://assets.taylorfrancis.com/wp-content/uploads/2020/09/01105733/CRC_Press_Logo.png — 200 — 7.4 KiB — 42 ms — h3https://assets.taylorfrancis.com/wp-content/uploads/2020/09/01185907/TFO_White.pngassets.taylorfrancis.com/wp-content... https://assets.taylorfrancis.com/wp-content/uploads/2020/09/01185907/TFO_White.png — 200 — 2.4 KiB — 57 ms — h3https://www.taylorfrancis.com/OpenSans-Regular-webfont.4f6ec530947c73b0c1dd.woff?v=1www.taylorfrancis.com/OpenSans-Regu... https://www.taylorfrancis.com/OpenSans-Regular-webfont.4f6ec530947c73b0c1dd.woff?v=1 — 200 — 23.0 KiB — 68 ms — h3https://www.taylorfrancis.com/OpenSans-Bold-webfont.7721ba0909593fb4c700.woff?v=1www.taylorfrancis.com/OpenSans-Bold... https://www.taylorfrancis.com/OpenSans-Bold-webfont.7721ba0909593fb4c700.woff?v=1 — 200 — 22.8 KiB — 66 ms — h3https://www.taylorfrancis.com/tf-icon-font.1c8aa49b38a468863785.ttfwww.taylorfrancis.com/tf-icon-font.... https://www.taylorfrancis.com/tf-icon-font.1c8aa49b38a468863785.ttf — 200 — 13.4 KiB — 143 ms — h3https://www.taylorfrancis.com/OpenSans-Semibold-webfont.e57adecb3a8973e1e0d7.woff?v=1www.taylorfrancis.com/OpenSans-Semi... https://www.taylorfrancis.com/OpenSans-Semibold-webfont.e57adecb3a8973e1e0d7.woff?v=1 — 200 — 23.3 KiB — 67 ms — h3https://platform.twitter.com/widgets/widget_iframe.2f70fb173b9000da126c79afe2098f02.html?origin=https%3A%2F%2Fwww.taylorfrancis.complatform.twitter.com/widgets/widget... 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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
100% of JavaScript execution is third-party
First-party Third-party 5313ms · 1448KB · €58/mo
www.taylorfrancis.com
Other
Costly
Execution 1380ms
Transfer 43 KB
Monthly Cost €15/mo
www.taylorfrancis.com
Other
Costly
Execution 775ms
Transfer 582 KB
Unused 59%
Monthly Cost €8/mo
Unattributable
Other
Costly
Execution 716ms
Transfer 0 KB
Monthly Cost €8/mo
Google Tag Manager
Tag Manager
Costly
Execution 580ms
Transfer 183 KB
Unused 31%
Monthly Cost €6/mo
transcend-cdn.com
Other
Costly
Execution 479ms
Transfer 78 KB
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 444ms
Transfer 167 KB
Unused 34%
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 334ms
Transfer 125 KB
Unused 49%
Monthly Cost €4/mo
transcend-cdn.com
Other
Costly
Execution 216ms
Transfer 85 KB
Unused 33%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 181ms
Transfer 146 KB
Unused 48%
Monthly Cost €2/mo
www.taylorfrancis.com
Other
Optional
Execution 119ms
Transfer 13 KB
Monthly Cost €1/mo
Twitter/X Embed
Social
Optional
Execution 88ms
Transfer 27 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.taylorfrancis.com adds 1380ms and costs ~€15/month
  • www.taylorfrancis.com adds 775ms and costs ~€8/month
  • Unattributable adds 716ms and costs ~€8/month
  • Google Tag Manager adds 580ms and costs ~€6/month
  • transcend-cdn.com adds 479ms and costs ~€5/month
  • Google Tag Manager adds 444ms and costs ~€5/month
  • Google Tag Manager adds 334ms and costs ~€4/month
  • transcend-cdn.com adds 216ms and costs ~€2/month

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.

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

www.taylorfrancis.com takes 1380ms 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

www.taylorfrancis.com takes 775ms 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

59% of www.taylorfrancis.com'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

Unattributable takes 716ms 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 580ms 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 479ms 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 444ms 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 334ms 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 216ms 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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