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https://thetrainline.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
75
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
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.
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.

1.58 s

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

1.89 s

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

234 ms

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

0.037

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

1.97 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.

4.37 s

Page Load Progression

688 ms
1.4 s
2.1 s
2.8 s
3.4 s
4.1 s
4.8 s
5.5 s
Checks
15
5 PASS 3 REVIEW 5 FIX
D
Page Weight Budget
Action
2.3 MB transferred, 77 requests
FIX
2.3 MB transferred, 77 requests
Info::
Page weighs 7.6 MB (2.3 MB transferred)
Warning::
JavaScript is 2.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.0 MB
Info::
77 HTTP requests
Info::
Estimated 0.49 g CO2 per page load
2.3 MB / 2.4 MB budget
2.3 MB transferred
77 requests
0.49 g CO2 per page load
JavaScript 2.0 MiB 86%
HTML 123.0 KiB 5%
CSS 66.1 KiB 3%
Fonts 41.6 KiB 2%
Other 39.4 KiB 2%
Images 26.8 KiB 1%
Other 26.2 KiB 1%
Other 6.5 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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 (2.3 MiB of 2.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
27 scripts, 999 KB unused
FIX
27 scripts, 999 KB unused
Warning::
https://www.thetrainline.com/public/hweb/js/Home.0...: 345 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.thetrainline.com/public/hweb/js/vendor...: 337 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 144 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NJR...: 76 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://accounts.google.com/gsi/client: 72 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 999 KB
999 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.thetrainline.com/public/hweb/js/Home.0f671f5c62979ec33431.mjs606 KB345 KB (57%)✓3rd
https://www.thetrainline.com/public/hweb/js/vendors.3dca4dc4707fd5fd9fe2.mjs647 KB337 KB (52%)✓3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31098007188 KB144 KB (77%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NJRBF7N194 KB76 KB (39%)✓3rd
https://accounts.google.com/gsi/client96 KB72 KB (75%)✓3rd
https://www.thetrainline.com/public/hweb/js/google-one-tap.40693ee5fb7af810d1e5.mjs30 KB25 KB (85%)✓3rd
https://www.thetrainline.com/public/hweb/js/shareable-login-it-IT-json-translations.d58965399cff02397f7e.mjs4 KB—✓3rd
https://widget.trustpilot.com/trustboxes/54ad5defc6454f065c28af8b/main.js18 KB—✓3rd
https://w.usabilla.com/6ba9830b2678.js?lv=111 KB—✓3rd
https://www.thetrainline.com/public/hweb/js/shareable-header-register-overlay.3f7018d6eefc7d4c1d5f.mjs6 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
77 resources · 2.3 MB · 999 KB savings available
FIX
77 resources · 2.3 MB · 999 KB savings available
Warning::
Page weight 1.3 MB over 1MB target
Got: 2.3 MB Expected: ≤ 1 MB
Info::
~999 KB of savings available
Warning::
76 third-party resources (100% of weight)
Info::
2 resources over 200KB
77 resources · 2.3 MiB · 76 third-party 1.3 MiB over 1MB target
JavaScript 86% · 2.0 MiB
Document 5% · 123.0 KiB
Other 3% · 68.4 KiB
CSS 3% · 66.1 KiB
Font 2% · 41.6 KiB
Image 1% · 30.6 KiB

~998.7 KiB of savings available

Remove unused JavaScript: 998.7 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.

B
Image Optimization
13 images, 0 KB saveable
REVIEW
13 images, 0 KB saveable
Warning::
https://static.trainlinecontent.com/content/vul/lo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
13 images 27 KB
0 oversized -0 KB
13 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

C
JS Execution Cost
Action
1865ms total JS execution
REVIEW
1865ms total JS execution
Warning::
https://www.thetrainline.com/public/hweb/js/Home.0...: 659ms CPU time
Warning::
https://www.thetrainline.com/en-us: 450ms CPU time
Info::
https://www.thetrainline.com/public/hweb/js/vendor...: 161ms CPU time
Info::
Unattributable: 159ms CPU time
Info::
https://www.thetrainline.com/public/hweb/js/app.31...: 149ms CPU time
Warning::
Third-party scripts: 1865ms (100% of total)

Main Thread Breakdown

Script Evaluation 51% Other 18% Rendering 11% Style & Layout 9% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://www.thetrainline.com/public/hweb/js/Home.0f671f5c62979ec33431.mjs659ms341ms38ms3rd
https://www.thetrainline.com/en-us450ms81ms12ms3rd
https://www.thetrainline.com/public/hweb/js/vendors.3dca4dc4707fd5fd9fe2.mjs161ms99ms49ms3rd
Unattributable159ms12ms0ms3rd
https://www.thetrainline.com/public/hweb/js/app.3186b531f11c9cd28b70.mjs149ms146ms3ms3rd
https://dd.thetrainline.com/tags.js81ms73ms2ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NJRBF7N78ms62ms16ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=3109800766ms47ms14ms3rd
https://js-agent.newrelic.com/nr-spa-1.313.1.min.js60ms48ms2ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
2 fonts (42 KB)
PASS
2 fonts (42 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

42 KB total

Render-blocking

0

of 2

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 FCP 1.6 s LCP 1.9 shttps://www.thetrainline.com/content/WEB/fonts/tl-circular-1.0.1/TLCircular-Bold.woff2TLCircular-Bold.woff2 https://www.thetrainline.com/content/WEB/fonts/tl-circular-1.0.1/TLCircular-Bold.woff2 — 40.0 KiB — 71 ms — font-display: swapdata:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA…font-woff;charset=utf-8... data:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA… — 1.6 KiB — 129 ms — font-display: swap
TLCircular-Bold.woff2 woff2 swap
Size 40 KB
Load time 71 ms
Start 989 ms
Risk FOUT — text flashes from fallback to web font
font-woff;charset=utf-8... woff swap
Size 2 KB
Load time 129 ms
Start 1.5 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)
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
Network Waterfall
77 requests over 3196ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.6 s LCP 1.9 shttps://thetrainline.com// https://thetrainline.com/ — 301 — 289 B — 86 ms — h2https://www.thetrainline.com/www.thetrainline.com/ https://www.thetrainline.com/ — 302 — 304 B — 260 ms — h2https://www.thetrainline.com/en-uswww.thetrainline.com/en-us https://www.thetrainline.com/en-us — 200 — 117.4 KiB — 358 ms — h2https://www.thetrainline.com/public/hweb/js/runtime~app.2cc44b5ca588de9bab5d.mjswww.thetrainline.com/public/hweb/js... https://www.thetrainline.com/public/hweb/js/runtime~app.2cc44b5ca588de9bab5d.mjs — 200 — 18.8 KiB — 167 ms — h2https://www.thetrainline.com/public/hweb/js/app.3186b531f11c9cd28b70.mjswww.thetrainline.com/public/hweb/js... https://www.thetrainline.com/public/hweb/js/app.3186b531f11c9cd28b70.mjs — 200 — 48.1 KiB — 159 ms — h2https://www.thetrainline.com/public/hweb/js/vendors.3dca4dc4707fd5fd9fe2.mjswww.thetrainline.com/public/hweb/js... https://www.thetrainline.com/public/hweb/js/vendors.3dca4dc4707fd5fd9fe2.mjs — 200 — 646.6 KiB — 305 ms — h2https://www.thetrainline.com/public/hweb/css/vendors.4b534df22c53362b537c.csswww.thetrainline.com/public/hweb/cs... https://www.thetrainline.com/public/hweb/css/vendors.4b534df22c53362b537c.css — 200 — 25.3 KiB — 138 ms — h2https://www.thetrainline.com/public/hweb/css/Home.8e552164d960dfbcba4e.csswww.thetrainline.com/public/hweb/cs... https://www.thetrainline.com/public/hweb/css/Home.8e552164d960dfbcba4e.css — 200 — 32.8 KiB — 288 ms — h2https://www.thetrainline.com/public/hweb/css/app.4e984c7dc74b64deef9c.csswww.thetrainline.com/public/hweb/cs... https://www.thetrainline.com/public/hweb/css/app.4e984c7dc74b64deef9c.css — 200 — 547 B — 285 ms — h2https://www.thetrainline.com/public/hweb/js/Home.0f671f5c62979ec33431.mjswww.thetrainline.com/public/hweb/js... https://www.thetrainline.com/public/hweb/js/Home.0f671f5c62979ec33431.mjs — 200 — 605.8 KiB — 333 ms — h2https://static.trainlinecontent.com/content/vul/logos/trainline-mint.svgstatic.trainlinecontent.com/content... https://static.trainlinecontent.com/content/vul/logos/trainline-mint.svg — 200 — 2.8 KiB — 311 ms — h2https://www.thetrainline.com/public/hweb/img/869c62f6129df610cf1c.svgwww.thetrainline.com/public/hweb/im... https://www.thetrainline.com/public/hweb/img/869c62f6129df610cf1c.svg — 200 — 827 B — 315 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 504 ms — https://dd.thetrainline.com/tags.jsdd.thetrainline.com/tags.js https://dd.thetrainline.com/tags.js — 200 — 39.4 KiB — 71 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-NJRBF7Nwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-NJRBF7N — 200 — 194.3 KiB — 168 ms — h2https://widget.trustpilot.com/bootstrap/v5/tp.widget.bootstrap.min.jswidget.trustpilot.com/bootstrap/v5/... https://widget.trustpilot.com/bootstrap/v5/tp.widget.bootstrap.min.js — 200 — 8.1 KiB — 59 ms — h2https://www.thetrainline.com/public/hweb/img/739016c17715b8ed310e.svgwww.thetrainline.com/public/hweb/im... https://www.thetrainline.com/public/hweb/img/739016c17715b8ed310e.svg — 200 — 896 B — 72 ms — h2https://www.thetrainline.com/public/hweb/img/2e86e5721b702240b65d.svgwww.thetrainline.com/public/hweb/im... https://www.thetrainline.com/public/hweb/img/2e86e5721b702240b65d.svg — 200 — 1.3 KiB — 71 ms — h2https://www.thetrainline.com/content/WEB/fonts/tl-circular-1.0.1/TLCircular-Bold.woff2www.thetrainline.com/content/WEB/fo... https://www.thetrainline.com/content/WEB/fonts/tl-circular-1.0.1/TLCircular-Bold.woff2 — 200 — 40.0 KiB — 71 ms — h2https://www.thetrainline.com/api/locations-search/v1/search?codes=urn%3Atrainline%3Ageneric%3Aloc%3A5974&codes=urn%3Atrainline%3Ageneric%3Aloc%3A8483&codes=urn%3Atrainline%3Ageneric%3Aloc%3A8433&codes=urn%3Atrainline%3Ageneric%3Aloc%3A6617www.thetrainline.com/api/locations-... https://www.thetrainline.com/api/locations-search/v1/search?codes=urn%3Atrainline%3Ageneric%3Aloc%3A5974&codes=urn%3Atrainline%3Ageneric%3Aloc%3A8483&codes=urn%3Atrainline%3Ageneric%3Aloc%3A8433&codes=urn%3Atrainline%3Ageneric%3Aloc%3A6617 — 200 — 1.3 KiB — 122 ms — h2https://w.usabilla.com/6ba9830b2678.js?lv=1w.usabilla.com/6ba9830b2678.js?lv=1 https://w.usabilla.com/6ba9830b2678.js?lv=1 — 200 — 11.0 KiB — 134 ms — h2https://www.thetrainline.com/api/basket?nocreate=1www.thetrainline.com/api/basket?noc... https://www.thetrainline.com/api/basket?nocreate=1 — 404 — 477 B — 176 ms — h2https://www.thetrainline.com/public/hweb/css/shareable-header-register-overlay.813bb9e939630cbfa9ca.csswww.thetrainline.com/public/hweb/cs... https://www.thetrainline.com/public/hweb/css/shareable-header-register-overlay.813bb9e939630cbfa9ca.css — 200 — 1.5 KiB — 71 ms — h2https://www.thetrainline.com/public/hweb/js/shareable-header-register-overlay.3f7018d6eefc7d4c1d5f.mjswww.thetrainline.com/public/hweb/js... https://www.thetrainline.com/public/hweb/js/shareable-header-register-overlay.3f7018d6eefc7d4c1d5f.mjs — 200 — 6.2 KiB — 71 ms — h2data:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA…data:application/font-woff;charset=... data:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA… — 200 — 1.6 KiB — 129 ms — datahttps://www.thetrainline.com/versionwww.thetrainline.com/version https://www.thetrainline.com/version — 200 — 560 B — 157 ms — h2https://www.thetrainline.com/login-service/v6/userwww.thetrainline.com/login-service/... https://www.thetrainline.com/login-service/v6/user — 204 — 282 B — 187 ms — h2https://www.thetrainline.com/api/locations-search/v2/search?locale=en-us&connections=urn%3Atrainline%3Aconnection%3Aatoc&connections=urn%3Atrainline%3Aconnection%3Abenerail&connections=urn%3Atrainline%3Aconnection%3Abusbud&connections=urn%3Atrainline%3Aconnection%3Abusbud_affiliate&connections=urn%3Atrainline%3Aconnection%3Acercanias&connections=urn%3Atrainline%3Aconnection%3Acff&connections=urn%3Atrainline%3Aconnection%3Adb&connections=urn%3Atrainline%3Aconnection%3Adb_pst&connections=urn%3Atrainline%3Aconnection%3Adistribusion&connections=urn%3Atrainline%3Aconnection%3Aflixbus_affiliate&connections=urn%3Atrainline%3Aconnection%3Antv&connections=urn%3Atrainline%3Aconnection%3Aobb&connections=urn%3Atrainline%3Aconnection%3Apao_ouigo&connections=urn%3Atrainline%3Aconnection%3Apao_sncf&connections=urn%3Atrainline%3Aconnection%3Arenfe&connections=urn%3Atrainline%3Aconnection%3Atrenitalia&connections=urn%3Atrainline%3Aconnection%3Awestbahn&connections=urn%3Atrainline%3Aconnection%3Aeurostardirect&connections=urn%3Atrainline%3Aconnection%3Ailsa&connections=urn%3Atrainline%3Aconnection%3Aouigospaindirectwww.thetrainline.com/api/locations-... https://www.thetrainline.com/api/locations-search/v2/search?locale=en-us&connections=urn%3Atrainline%3Aconnection%3Aatoc&connections=urn%3Atrainline%3Aconnection%3Abenerail&connections=urn%3Atrainline%3Aconnection%3Abusbud&connections=urn%3Atrainline%3Aconnection%3Abusbud_affiliate&connections=urn%3Atrainline%3Aconnection%3Acercanias&connections=urn%3Atrainline%3Aconnection%3Acff&connections=urn%3Atrainline%3Aconnection%3Adb&connections=urn%3Atrainline%3Aconnection%3Adb_pst&connections=urn%3Atrainline%3Aconnection%3Adistribusion&connections=urn%3Atrainline%3Aconnection%3Aflixbus_affiliate&connections=urn%3Atrainline%3Aconnection%3Antv&connections=urn%3Atrainline%3Aconnection%3Aobb&connections=urn%3Atrainline%3Aconnection%3Apao_ouigo&connections=urn%3Atrainline%3Aconnection%3Apao_sncf&connections=urn%3Atrainline%3Aconnection%3Arenfe&connections=urn%3Atrainline%3Aconnection%3Atrenitalia&connections=urn%3Atrainline%3Aconnection%3Awestbahn&connections=urn%3Atrainline%3Aconnection%3Aeurostardirect&connections=urn%3Atrainline%3Aconnection%3Ailsa&connections=urn%3Atrainline%3Aconnection%3Aouigospaindirect — 200 — 2.6 KiB — 117 ms — h2https://www.thetrainline.com/login-service/v6/userwww.thetrainline.com/login-service/... https://www.thetrainline.com/login-service/v6/user — 204 — 281 B — 180 ms — h2https://www.thetrainline.com/graphqlwww.thetrainline.com/graphql https://www.thetrainline.com/graphql — 200 — 17.9 KiB — 181 ms — h2
0 ms 1.0 s 2.0 s 3.0 s FCP 1.6 s LCP 1.9 shttps://thetrainline.com// https://thetrainline.com/ — 301 — 289 B — 86 ms — h2https://www.thetrainline.com/www.thetrainline.com/ https://www.thetrainline.com/ — 302 — 304 B — 260 ms — h2https://www.thetrainline.com/en-uswww.thetrainline.com/en-us https://www.thetrainline.com/en-us — 200 — 117.4 KiB — 358 ms — h2https://www.thetrainline.com/public/hweb/js/runtime~app.2cc44b5ca588de9bab5d.mjswww.thetrainline.com/public/hweb/js... https://www.thetrainline.com/public/hweb/js/runtime~app.2cc44b5ca588de9bab5d.mjs — 200 — 18.8 KiB — 167 ms — h2https://www.thetrainline.com/public/hweb/js/app.3186b531f11c9cd28b70.mjswww.thetrainline.com/public/hweb/js... https://www.thetrainline.com/public/hweb/js/app.3186b531f11c9cd28b70.mjs — 200 — 48.1 KiB — 159 ms — h2https://www.thetrainline.com/public/hweb/js/vendors.3dca4dc4707fd5fd9fe2.mjswww.thetrainline.com/public/hweb/js... https://www.thetrainline.com/public/hweb/js/vendors.3dca4dc4707fd5fd9fe2.mjs — 200 — 646.6 KiB — 305 ms — h2https://www.thetrainline.com/public/hweb/css/vendors.4b534df22c53362b537c.csswww.thetrainline.com/public/hweb/cs... https://www.thetrainline.com/public/hweb/css/vendors.4b534df22c53362b537c.css — 200 — 25.3 KiB — 138 ms — h2https://www.thetrainline.com/public/hweb/css/Home.8e552164d960dfbcba4e.csswww.thetrainline.com/public/hweb/cs... https://www.thetrainline.com/public/hweb/css/Home.8e552164d960dfbcba4e.css — 200 — 32.8 KiB — 288 ms — h2https://www.thetrainline.com/public/hweb/css/app.4e984c7dc74b64deef9c.csswww.thetrainline.com/public/hweb/cs... https://www.thetrainline.com/public/hweb/css/app.4e984c7dc74b64deef9c.css — 200 — 547 B — 285 ms — h2https://www.thetrainline.com/public/hweb/js/Home.0f671f5c62979ec33431.mjswww.thetrainline.com/public/hweb/js... https://www.thetrainline.com/public/hweb/js/Home.0f671f5c62979ec33431.mjs — 200 — 605.8 KiB — 333 ms — 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https://bam.nr-data.net/events/1/80752ce357?a=1505883367&v=1.313.1&to=YVxWMhRZW0JYBhVYXFgWcR4WSlBCSg8SHnRzbRtJTA%3D%3D&rst=2902&ck=0&s=8c5e404e71b6e4d8&ref=https://www.thetrainline.com/en-us&ptid=caf0338d02c6c3ad — 200 — 373 B — 104 ms — http/1.1https://bam.nr-data.net/jserrors/1/80752ce357?a=1505883367&v=1.313.1&to=YVxWMhRZW0JYBhVYXFgWcR4WSlBCSg8SHnRzbRtJTA%3D%3D&rst=2904&ck=0&s=8c5e404e71b6e4d8&ref=https://www.thetrainline.com/en-us&ptid=caf0338d02c6c3ad&ri=%7B%22LeisureHomepageWeb%22:%22e7f315931954ae0a27ce1a60902975fa90c10ff7%22%7Dbam.nr-data.net/jserrors/1/80752ce3... https://bam.nr-data.net/jserrors/1/80752ce357?a=1505883367&v=1.313.1&to=YVxWMhRZW0JYBhVYXFgWcR4WSlBCSg8SHnRzbRtJTA%3D%3D&rst=2904&ck=0&s=8c5e404e71b6e4d8&ref=https://www.thetrainline.com/en-us&ptid=caf0338d02c6c3ad&ri=%7B%22LeisureHomepageWeb%22:%22e7f315931954ae0a27ce1a60902975fa90c10ff7%22%7D — 200 — 373 B — 110 ms — http/1.1https://bam.nr-data.net/events/1/80752ce357?a=1505883367&v=1.313.1&to=YVxWMhRZW0JYBhVYXFgWcR4WSlBCSg8SHnRzbRtJTA%3D%3D&rst=2907&ck=0&s=8c5e404e71b6e4d8&ref=https://www.thetrainline.com/en-us&ptid=caf0338d02c6c3adbam.nr-data.net/events/1/80752ce357... https://bam.nr-data.net/events/1/80752ce357?a=1505883367&v=1.313.1&to=YVxWMhRZW0JYBhVYXFgWcR4WSlBCSg8SHnRzbRtJTA%3D%3D&rst=2907&ck=0&s=8c5e404e71b6e4d8&ref=https://www.thetrainline.com/en-us&ptid=caf0338d02c6c3ad — 200 — 373 B — 108 ms — http/1.1https://bam.nr-data.net/ins/1/80752ce357?a=1505883367&v=1.313.1&to=YVxWMhRZW0JYBhVYXFgWcR4WSlBCSg8SHnRzbRtJTA%3D%3D&rst=2909&ck=0&s=8c5e404e71b6e4d8&ref=https://www.thetrainline.com/en-us&ptid=caf0338d02c6c3ad&at=TRtBRFxDF0l9ABdYUFNtTRYDGg8TXQASWkdZSRZKRHtaX00AGUV6UhsORAdZAVcPB1NTHlcPDAdLDFFVAEhYUlIBFAIDVwhTUw9VAFQDABtJGw%3D%3Dbam.nr-data.net/ins/1/80752ce357?a=... https://bam.nr-data.net/ins/1/80752ce357?a=1505883367&v=1.313.1&to=YVxWMhRZW0JYBhVYXFgWcR4WSlBCSg8SHnRzbRtJTA%3D%3D&rst=2909&ck=0&s=8c5e404e71b6e4d8&ref=https://www.thetrainline.com/en-us&ptid=caf0338d02c6c3ad&at=TRtBRFxDF0l9ABdYUFNtTRYDGg8TXQASWkdZSRZKRHtaX00AGUV6UhsORAdZAVcPB1NTHlcPDAdLDFFVAEhYUlIBFAIDVwhTUw9VAFQDABtJGw%3D%3D — 204 — 351 B — 286 ms — http/1.1
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 1865ms · 1870KB · $32/mo
www.thetrainline.com
Other
Costly
Execution 659ms
Transfer 606 KB
Unused 57%
Monthly Cost $11/mo
www.thetrainline.com
Other
Costly
Execution 450ms
Transfer 117 KB
Monthly Cost $8/mo
www.thetrainline.com
Other
Optional
Execution 161ms
Transfer 647 KB
Unused 52%
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 159ms
Transfer 0 KB
Monthly Cost $3/mo
www.thetrainline.com
Other
Optional
Execution 149ms
Transfer 48 KB
Monthly Cost $3/mo
dd.thetrainline.com
Other
Optional
Execution 81ms
Transfer 39 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 78ms
Transfer 194 KB
Unused 39%
Monthly Cost $1/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 66ms
Transfer 188 KB
Unused 77%
Monthly Cost $1/mo
js-agent.newrelic.com
Other
Optional
Execution 60ms
Transfer 30 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.thetrainline.com adds 659ms and costs ~$11/month
  • www.thetrainline.com adds 450ms and costs ~$8/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.thetrainline.com takes 659ms 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 www.thetrainline.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

www.thetrainline.com takes 450ms 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

52% of www.thetrainline.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

77% of securepubads.g.doubleclick.net'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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