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https://thetrainline.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
51
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

3.12 s

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

3.75 s

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

1.75 s

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.

6.26 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.

17.22 s

Page Load Progression

633 ms
1.3 s
1.9 s
2.5 s
3.2 s
3.8 s
4.4 s
5.1 s
Checks
17
7 PASS 2 REVIEW 6 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 62 requests
FIX
2.2 MB transferred, 62 requests
Info::
Page weighs 7.2 MB (2.2 MB transferred)
Warning::
JavaScript is 1.9 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.9 MB
Info::
62 HTTP requests
Info::
Estimated 0.45 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
62 requests
0.45 g CO2 per page load
JavaScript 1.9 MiB 86%
HTML 125.5 KiB 6%
CSS 60.1 KiB 3%
Fonts 41.6 KiB 2%
Other 39.4 KiB 2%
Other 26.2 KiB 1%
Images 8.1 KiB 0%
Other 4.4 KiB 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 (2.2 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6848ms total JS execution
FIX
6848ms total JS execution
Warning::
https://www.thetrainline.com/public/hweb/js/Home.0...: 2327ms CPU time
Warning::
https://www.thetrainline.com/en-us: 1466ms CPU time
Warning::
https://www.thetrainline.com/public/hweb/js/vendor...: 619ms CPU time
Warning::
https://www.thetrainline.com/public/hweb/js/app.31...: 587ms CPU time
Warning::
Unattributable: 536ms CPU time
Warning::
Third-party scripts: 6848ms (100% of total)

Main Thread Breakdown

Script Evaluation 53% Other 17% Rendering 10% Style & Layout 9% Script Parsing & Compilation 9%
ScriptTotalScriptingParse/CompileParty
https://www.thetrainline.com/public/hweb/js/Home.0f671f5c62979ec33431.mjs2327ms1338ms153ms3rd
https://www.thetrainline.com/en-us1466ms244ms53ms3rd
https://www.thetrainline.com/public/hweb/js/vendors.3dca4dc4707fd5fd9fe2.mjs619ms335ms223ms3rd
https://www.thetrainline.com/public/hweb/js/app.3186b531f11c9cd28b70.mjs587ms572ms14ms3rd
Unattributable536ms48ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NJRBF7N314ms249ms63ms3rd
https://dd.thetrainline.com/tags.js223ms179ms10ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097963182ms122ms53ms3rd
https://js-agent.newrelic.com/nr-spa-1.313.1.min.js172ms138ms8ms3rd
https://www.thetrainline.com/public/hweb/js/intl-Leisure-locales-en-US-asyncMessages-json.36e6b698515036aa43b4.mjs164ms153ms1ms3rd

Showing top 10 of 13 scripts

F
JS Bundles
Action
24 scripts, 906 KB unused
FIX
24 scripts, 906 KB unused
Warning::
https://www.thetrainline.com/public/hweb/js/Home.0...: 348 KB unused (58%)
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...: 145 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.
Info::
Total unused JavaScript: 906 KB
906 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.thetrainline.com/public/hweb/js/Home.0f671f5c62979ec33431.mjs606 KB348 KB (58%)✓3rd
https://www.thetrainline.com/public/hweb/js/vendors.3dca4dc4707fd5fd9fe2.mjs647 KB337 KB (52%)✓3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097963187 KB145 KB (77%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NJRBF7N194 KB76 KB (39%)✓3rd
https://securepubads.g.doubleclick.net/tag/js/gpt.js34 KB—✓3rd
https://dd.thetrainline.com/tags.js39 KB—✓3rd
https://www.thetrainline.com/public/hweb/js/runtime~app.2cc44b5ca588de9bab5d.mjs19 KB—✓3rd
https://widget.trustpilot.com/bootstrap/v5/tp.widget.bootstrap.min.js8 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

F
Page Weight Inventory
Action
62 resources · 2.2 MB · 906 KB savings available
FIX
62 resources · 2.2 MB · 906 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~906 KB of savings available
Warning::
61 third-party resources (100% of weight)
Info::
2 resources over 200KB
62 resources · 2.2 MiB · 61 third-party 1.2 MiB over 1MB target
JavaScript 86% · 1.9 MiB
Document 6% · 125.5 KiB
Other 3% · 66.3 KiB
CSS 3% · 60.1 KiB
Font 2% · 41.6 KiB
Image 1% · 11.9 KiB

~906.0 KiB of savings available

Remove unused JavaScript: 906.0 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
6 images, 0 KB saveable
REVIEW
6 images, 0 KB saveable
Warning::
https://static.trainlinecontent.com/content/WEB/im... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.trainlinecontent.com/content/WEB/im... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.trainlinecontent.com/content/WEB/im... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
6 images 8 KB
0 oversized -0 KB
6 legacy format
3 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

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 1.0 s 2.0 s 3.0 s FCP 3.1 s LCP 3.7 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 — 68 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 — 116 ms — font-display: swap
TLCircular-Bold.woff2 woff2 swap
Size 40 KB
Load time 68 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
font-woff;charset=utf-8... woff swap
Size 2 KB
Load time 116 ms
Start 1.7 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
7 hints, 0 missing preconnects
PASS
7 hints, 0 missing preconnects
Info::
Page uses 7 resource hint(s)

Current Resource Hints

preconnect
—
preload
7
dns-prefetch
—
prefetch
—

7 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
Network Waterfall
62 requests over 2747ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 3.1 s LCP 3.7 shttps://thetrainline.com// https://thetrainline.com/ — 301 — 285 B — 137 ms — h2https://www.thetrainline.com/www.thetrainline.com/ https://www.thetrainline.com/ — 302 — 302 B — 254 ms — h2https://www.thetrainline.com/en-uswww.thetrainline.com/en-us https://www.thetrainline.com/en-us — 200 — 119.9 KiB — 569 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 — 113 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 — 143 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 — 268 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 — 122 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 — 242 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 — 546 B — 239 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 — 286 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 — 280 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 61 ms — https://dd.thetrainline.com/tags.jsdd.thetrainline.com/tags.js https://dd.thetrainline.com/tags.js — 200 — 39.4 KiB — 202 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 — 176 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 — 97 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 — 895 B — 68 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 — 68 ms — h2https://static.trainlinecontent.com/content/WEB/images/partnerships/train.svgstatic.trainlinecontent.com/content... https://static.trainlinecontent.com/content/WEB/images/partnerships/train.svg — 200 — 1.1 KiB — 65 ms — h2https://static.trainlinecontent.com/content/WEB/images/partnerships/bed.svgstatic.trainlinecontent.com/content... https://static.trainlinecontent.com/content/WEB/images/partnerships/bed.svg — 200 — 950 B — 66 ms — h2https://static.trainlinecontent.com/content/WEB/images/partnerships/castle.svgstatic.trainlinecontent.com/content... https://static.trainlinecontent.com/content/WEB/images/partnerships/castle.svg — 200 — 1.1 KiB — 67 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 — 68 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 — 116 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 — 146 ms — h2https://www.thetrainline.com/api/basket?nocreate=1www.thetrainline.com/api/basket?noc... https://www.thetrainline.com/api/basket?nocreate=1 — 404 — 478 B — 170 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 — 67 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 — 67 ms — h2https://www.thetrainline.com/public/hweb/js/shareable-login-de-DE-json-translations.2926cabfaa5ba1a20eec.mjswww.thetrainline.com/public/hweb/js... https://www.thetrainline.com/public/hweb/js/shareable-login-de-DE-json-translations.2926cabfaa5ba1a20eec.mjs — 200 — 3.9 KiB — 66 ms — h2https://www.thetrainline.com/public/hweb/js/shareable-login-fr-FR-json-translations.1bda3a5ef563a0174177.mjswww.thetrainline.com/public/hweb/js... https://www.thetrainline.com/public/hweb/js/shareable-login-fr-FR-json-translations.1bda3a5ef563a0174177.mjs — 200 — 3.8 KiB — 67 ms — h2https://www.thetrainline.com/public/hweb/js/shareable-login-it-IT-json-translations.d58965399cff02397f7e.mjswww.thetrainline.com/public/hweb/js... https://www.thetrainline.com/public/hweb/js/shareable-login-it-IT-json-translations.d58965399cff02397f7e.mjs — 200 — 3.7 KiB — 67 ms — h2https://www.thetrainline.com/public/hweb/js/shareable-login-pt-BR-json-translations.dc81a9528b0e5cd4f2cd.mjswww.thetrainline.com/public/hweb/js... https://www.thetrainline.com/public/hweb/js/shareable-login-pt-BR-json-translations.dc81a9528b0e5cd4f2cd.mjs — 200 — 3.7 KiB — 68 ms — h2
0 ms 1.0 s 2.0 s 3.0 s FCP 3.1 s LCP 3.7 shttps://thetrainline.com// https://thetrainline.com/ — 301 — 285 B — 137 ms — h2https://www.thetrainline.com/www.thetrainline.com/ https://www.thetrainline.com/ — 302 — 302 B — 254 ms — h2https://www.thetrainline.com/en-uswww.thetrainline.com/en-us https://www.thetrainline.com/en-us — 200 — 119.9 KiB — 569 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 — 113 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 — 143 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 — 268 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 — 122 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 — 242 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 — 546 B — 239 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 — 286 ms — 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http/1.1https://bam.nr-data.net/ins/1/80752ce357?a=1505883367&v=1.313.1&to=YVxWMhRZW0JYBhVYXFgWcR4WSlBCSg8SHnRzbRtJTA%3D%3D&rst=2623&ck=0&s=22ebaf4e9b867385&ref=https://www.thetrainline.com/en-us&ptid=314fbdc1a4f4abf7&at=TRtBRFxDF0l9ABdYUFNtTRYDGg8TVAoDWF9TGxhEJVdbRVwdFXhXFAMWVQMBBVILBwMcUAcOBEtSCQZSFARQUgEbXwBUUA1UB1tWAFQFFERJbam.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=2623&ck=0&s=22ebaf4e9b867385&ref=https://www.thetrainline.com/en-us&ptid=314fbdc1a4f4abf7&at=TRtBRFxDF0l9ABdYUFNtTRYDGg8TVAoDWF9TGxhEJVdbRVwdFXhXFAMWVQMBBVILBwMcUAcOBEtSCQZSFARQUgEbXwBUUA1UB1tWAFQFFERJ — 204 — 351 B — 118 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 6848ms · 1949KB · $118/mo
www.thetrainline.com
Other
Costly
Execution 2327ms
Transfer 606 KB
Unused 58%
Monthly Cost $40/mo
www.thetrainline.com
Other
Costly
Execution 1466ms
Transfer 120 KB
Monthly Cost $25/mo
www.thetrainline.com
Other
Costly
Execution 619ms
Transfer 647 KB
Unused 52%
Monthly Cost $11/mo
www.thetrainline.com
Other
Costly
Execution 587ms
Transfer 48 KB
Monthly Cost $10/mo
Unattributable
Other
Costly
Execution 536ms
Transfer 0 KB
Monthly Cost $9/mo
Google Tag Manager
Tag Manager
Costly
Execution 314ms
Transfer 194 KB
Unused 39%
Monthly Cost $5/mo
dd.thetrainline.com
Other
Costly
Execution 223ms
Transfer 39 KB
Monthly Cost $4/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 182ms
Transfer 187 KB
Unused 77%
Monthly Cost $3/mo
js-agent.newrelic.com
Other
Optional
Execution 172ms
Transfer 30 KB
Monthly Cost $3/mo
www.thetrainline.com
Other
Optional
Execution 164ms
Transfer 2 KB
Monthly Cost $3/mo
cdn.branch.io
Other
Optional
Execution 117ms
Transfer 23 KB
Monthly Cost $2/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 79ms
Transfer 34 KB
Monthly Cost $1/mo
www.thetrainline.com
Other
Optional
Execution 61ms
Transfer 18 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.thetrainline.com adds 2327ms and costs ~$40/month
  • www.thetrainline.com adds 1466ms and costs ~$25/month
  • www.thetrainline.com adds 619ms and costs ~$11/month
  • www.thetrainline.com adds 587ms and costs ~$10/month
  • Unattributable adds 536ms and costs ~$9/month
  • Google Tag Manager adds 314ms and costs ~$5/month
  • dd.thetrainline.com adds 223ms 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.thetrainline.com takes 2327ms 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

58% 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 1466ms 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.thetrainline.com takes 619ms 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

www.thetrainline.com takes 587ms 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 536ms 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 314ms 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

dd.thetrainline.com takes 223ms 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

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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