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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
72
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.
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.

1.23 s

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

2.91 s

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

167 ms

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

0.035

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

2.24 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.

3.99 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
15
6 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
2.9 MB transferred, 75 requests
FIX
2.9 MB transferred, 75 requests
Warning::
Page weighs 7.3 MB (2.9 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
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
Info::
75 HTTP requests
Info::
Estimated 0.60 g CO2 per page load
2.9 MB / 2.4 MB budget
2.9 MB transferred
75 requests
0.60 g CO2 per page load
JavaScript 1.4 MiB 49%
Images 1.1 MiB 38%
HTML 146.5 KiB 5%
Other 89.3 KiB 3%
Fonts 82.5 KiB 3%
CSS 31.3 KiB 1%
Other 18.3 KiB 1%
Other 10.4 KiB 0%
Other 5.5 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

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

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 (2.9 MiB of 2.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
23 scripts, 616 KB unused
FIX
23 scripts, 616 KB unused
Warning::
https://www.taylorfrancis.com/main.467036cc4525a89...: 344 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 70 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5XM...: 60 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0HYE...: 58 KB unused (32%)
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.
Info::
Total unused JavaScript: 616 KB
616 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.taylorfrancis.com/main.467036cc4525a890d30b.js582 KB344 KB (59%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-11468783382&cx=c&gtm=4e64h1146 KB70 KB (48%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5XMJVLGN&gtm=4e64h1125 KB60 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-0HYE8YG0M6&cx=c&gtm=4e64h1183 KB58 KB (32%)✓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://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
75 resources · 2.9 MB · 616 KB savings available
FIX
75 resources · 2.9 MB · 616 KB savings available
Warning::
Page weight 1.9 MB over 1MB target
Got: 2.9 MB Expected: ≤ 1 MB
Info::
~616 KB of savings available
Warning::
74 third-party resources (100% of weight)
Info::
2 resources over 200KB
75 resources · 2.9 MiB · 74 third-party 1.9 MiB over 1MB target
JavaScript 49% · 1.4 MiB
Image 38% · 1.1 MiB
Document 6% · 165.3 KiB
Other 3% · 99.7 KiB
Font 3% · 82.5 KiB
CSS 1% · 31.3 KiB

~616.1 KiB of savings available

Remove unused JavaScript: 616.1 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
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
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.
Warning::
https://www.taylorfrancis.com/assets/images/tfgrou... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
22 images 1.1 MB
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

C
JS Execution Cost
Action
1405ms total JS execution
REVIEW
1405ms total JS execution
Warning::
https://www.taylorfrancis.com/: 366ms CPU time
Info::
https://www.taylorfrancis.com/main.467036cc4525a89...: 193ms CPU time
Info::
Unattributable: 188ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-0HYE...: 171ms CPU time
Info::
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88...: 146ms CPU time
Warning::
Third-party scripts: 1405ms (100% of total)

Main Thread Breakdown

Script Evaluation 70% Other 10% Script Parsing & Compilation 9% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
https://www.taylorfrancis.com/366ms218ms4ms3rd
https://www.taylorfrancis.com/main.467036cc4525a890d30b.js193ms128ms51ms3rd
Unattributable188ms60ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0HYE8YG0M6&cx=c&gtm=4e64h1171ms155ms15ms3rd
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/airgap.js146ms120ms8ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NSWZ4WX&gtm_auth=RdH6vmSGiXahuYVxcLqliQ&gtm_preview=env-1&gtm_cookies_win=x142ms112ms17ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5XMJVLGN&gtm=4e64h184ms71ms11ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-11468783382&cx=c&gtm=4e64h161ms50ms11ms3rd
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/tcf/ui.js54ms45ms7ms3rd
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 1.0 s 2.0 s 3.0 s FCP 1.2 s LCP 2.9 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 — 60 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 — 63 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 60 ms
Start 708 ms
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 708 ms
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 63 ms
Start 709 ms
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 709 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 ~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
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

Network Waterfall
75 requests over 3878ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.2 s LCP 2.9 shttps://taylorfrancis.com// https://taylorfrancis.com/ — 301 — 464 B — 162 ms — h3https://www.taylorfrancis.com/www.taylorfrancis.com/ https://www.taylorfrancis.com/ — 200 — 43.2 KiB — 312 ms — h3https://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 — 115 ms — h3https://www.taylorfrancis.com/styles.096dfd72296b0061727a.csswww.taylorfrancis.com/styles.096dfd... https://www.taylorfrancis.com/styles.096dfd72296b0061727a.css — 200 — 27.9 KiB — 80 ms — h3https://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 — 81 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 — 62 ms — h3https://www.taylorfrancis.com/runtime.6e966365d15ffaa0ee3d.jswww.taylorfrancis.com/runtime.6e966... https://www.taylorfrancis.com/runtime.6e966365d15ffaa0ee3d.js — 200 — 1.6 KiB — 48 ms — h3https://www.taylorfrancis.com/polyfills.9dd1173e3b9fbfecac89.jswww.taylorfrancis.com/polyfills.9dd... https://www.taylorfrancis.com/polyfills.9dd1173e3b9fbfecac89.js — 200 — 13.0 KiB — 59 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 — 6.5 KiB — 53 ms — h3https://www.taylorfrancis.com/main.467036cc4525a890d30b.jswww.taylorfrancis.com/main.467036cc... https://www.taylorfrancis.com/main.467036cc4525a890d30b.js — 200 — 581.5 KiB — 160 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 — 84.6 KiB — 101 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 — 146 ms — h2https://platform.twitter.com/widgets.jsplatform.twitter.com/widgets.js https://platform.twitter.com/widgets.js — 200 — 27.3 KiB — 152 ms — h2https://www.taylorfrancis.com/assets/manifest.jsonwww.taylorfrancis.com/assets/manife... https://www.taylorfrancis.com/assets/manifest.json — 404 — 9.5 KiB — 397 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 — 45 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 — 54 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 — 54 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 — 56 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 — 59 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 — 58 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 — 58 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 — 60 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 — 63 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://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/tcf/vendor-list.jsontranscend-cdn.com/cm/ef49a3f1-d8c1-... https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/tcf/vendor-list.json — 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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 1405ms · 1407KB · €15/mo
www.taylorfrancis.com
Other
Costly
Execution 366ms
Transfer 43 KB
Monthly Cost €4/mo
www.taylorfrancis.com
Other
Optional
Execution 193ms
Transfer 582 KB
Unused 59%
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 188ms
Transfer 0 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 171ms
Transfer 183 KB
Unused 32%
Monthly Cost €2/mo
transcend-cdn.com
Other
Optional
Execution 146ms
Transfer 78 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 142ms
Transfer 167 KB
Unused 34%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 84ms
Transfer 125 KB
Unused 48%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 61ms
Transfer 146 KB
Unused 48%
Monthly Cost €1/mo
transcend-cdn.com
Other
Optional
Execution 54ms
Transfer 85 KB
Unused 33%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.taylorfrancis.com adds 366ms and costs ~€4/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 366ms 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

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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