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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
3
REVIEW
5
PASS
7
INFO
2

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

Mobile Desktop
81
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.
100
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.

2.16 s

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

3.58 s

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

330 ms

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

0.000

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

2.16 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.

9.74 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
7 PASS 5 REVIEW 3 FIX
D
Third-Party Impact
Action
76% third-party, 0 ms blocking
FIX
76% third-party, 0 ms blocking
Warning::
Third-party code accounts for 76% of page weight (1002.7 KiB of 1.3 MiB)
Info::
Third-party blocking time is low (0 ms)
24%
76%
First-party Third-party
D
JS Execution Cost
Action
2347ms total JS execution
FIX
2347ms total JS execution
Warning::
https://link.springer.com/: 872ms CPU time
Warning::
https://sgtm.springer.com/gtm.js?id=GTM-MRVXSHQ: 533ms CPU time
Warning::
Unattributable: 346ms CPU time
Info::
https://cmp.springer.com/production_live/en/consen...: 248ms CPU time
Info::
https://pagead2.googlesyndication.com/pagead/manag...: 168ms CPU time
Warning::
Third-party scripts: 1475ms (63% of total)

Main Thread Breakdown

Script Evaluation 41% Other 26% Style & Layout 19% Script Parsing & Compilation 8% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://link.springer.com/872ms30ms8ms1st
https://sgtm.springer.com/gtm.js?id=GTM-MRVXSHQ533ms443ms60ms3rd
Unattributable346ms14ms0ms3rd
https://cmp.springer.com/production_live/en/consent-bundle-17-72.js248ms176ms15ms3rd
https://pagead2.googlesyndication.com/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097963168ms115ms52ms3rd
https://cdn.jsdelivr.net/npm/mathjax@2.7.5/config/TeX-AMS-MML_SVG.js?V=2.7.5104ms73ms29ms3rd
https://pagead2.googlesyndication.com/tag/js/gpt.js77ms64ms11ms3rd
D
Page Weight Inventory
Action
39 resources · 1.3 MB · 248 KB savings available
FIX
39 resources · 1.3 MB · 248 KB savings available
Warning::
Page weight 304 KB over 1MB target
Got: 1.3 MB Expected: ≤ 1 MB
Info::
~248 KB of savings available
Warning::
19 third-party resources (76% of weight)
39 resources · 1.3 MiB · 19 third-party 304.1 KiB over 1MB target
JavaScript 44% · 584.6 KiB
Image 43% · 567.4 KiB
Other 5% · 63.0 KiB
Font 4% · 49.3 KiB
Document 4% · 49.1 KiB
CSS 1% · 14.7 KiB

~248.3 KiB of savings available

Remove unused JavaScript: 248.3 KiB
B
Page Weight Budget
1.3 MB transferred, 39 requests
REVIEW
1.3 MB transferred, 39 requests
Info::
Page weighs 3.3 MB (1.3 MB transferred)
Warning::
JavaScript is 585 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 585 KB
Info::
39 HTTP requests
Info::
Estimated 0.27 g CO2 per page load
1.3 MB / 2.4 MB budget
1.3 MB transferred
39 requests
0.27 g CO2 per page load
JavaScript 584.6 KiB 44%
Images 565.9 KiB 43%
Fonts 49.3 KiB 4%
HTML 49.1 KiB 4%
Other 38.1 KiB 3%
Other 25.7 KiB 2%
CSS 14.7 KiB 1%
Other 633 B 0%
0 2.4 MB 4.9 MB
Under 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

B
Image Optimization
17 images, 0 KB saveable
REVIEW
17 images, 0 KB saveable
Warning::
https://link.springer.com/oscar-static/images/darw... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
17 images 566 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 Bundles
Action
10 scripts, 248 KB unused
REVIEW
10 scripts, 248 KB unused
Warning::
https://pagead2.googlesyndication.com/pagead/manag...: 143 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://sgtm.springer.com/gtm.js?id=GTM-MRVXSHQ: 67 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.jsdelivr.net/npm/mathjax@2.7.5/config/...: 39 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 248 KB
248 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://pagead2.googlesyndication.com/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097963187 KB143 KB (76%)✓3rd
https://sgtm.springer.com/gtm.js?id=GTM-MRVXSHQ200 KB67 KB (34%)✓3rd
https://cdn.jsdelivr.net/npm/mathjax@2.7.5/config/TeX-AMS-MML_SVG.js?V=2.7.570 KB39 KB (56%)✓3rd
https://link.springer.com/oscar-static/js/polyfill-es5-bundle-f665f963ea.js23 KB—✓1st
https://cmp.springer.com/production_live/en/consent-bundle-17-72.js40 KB—✓3rd
https://link.springer.com/oscar-static/js/base-es6-bundle-e6012746a2.js9 KB—✓1st
https://cdn.jsdelivr.net/npm/mathjax@2.7.5/MathJax.js?config=TeX-AMS-MML_SVG.js20 KB—✓3rd
https://cdn.jsdelivr.net/npm/mathjax@2.7.5/jax/output/HTML-CSS/config.js?V=2.7.52 KB—✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MRVXSHQ&gtg_health=10 KB—✓3rd
https://pagead2.googlesyndication.com/tag/js/gpt.js34 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
no-cache
REVIEW
no-cache
Info::
Cache-Control header is set
Got: no-cache
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache

DirectiveValueMeaning
no-cache—Cache but always revalidate first
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
1 fonts (49 KB)
PASS
1 fonts (49 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

49 KB total

Render-blocking

0

of 1

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 2.2 s LCP 3.6 shttps://link.springer.com/oscar-static/fonts/merriweather/subsets/latin/MerriweatherSans-Variable-Optimised-latin-subset-6a2bbc1ea4.woff2MerriweatherSans-Variab... https://link.springer.com/oscar-static/fonts/merriweather/subsets/latin/MerriweatherSans-Variable-Optimised-latin-subset-6a2bbc1ea4.woff2 — 49.3 KiB — 12 ms — font-display: swap
MerriweatherSans-Variab... woff2 swap
Size 49 KB
Load time 12 ms
Start 429 ms
Risk FOUT — text flashes from fallback to web font
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
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
39 requests over 1097ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 2.2 s LCP 3.6 shttps://link.springer.com// https://link.springer.com/ — 303 — 656 B — 96 ms — h2https://idp.springer.com/authorize?response_type=cookie&client_id=springerlink&redirect_uri=https%3A%2F%2Flink.springer.com%2Fidp.springer.com/authorize?response... https://idp.springer.com/authorize?response_type=cookie&client_id=springerlink&redirect_uri=https%3A%2F%2Flink.springer.com%2F — 302 — 639 B — 49 ms — h2https://link.springer.com// https://link.springer.com/ — 200 — 49.1 KiB — 180 ms — h2https://link.springer.com/oscar-static/app-springerlink/css/core-darwin-e33163985d.css/oscar-static/app-springerlink/css/... https://link.springer.com/oscar-static/app-springerlink/css/core-darwin-e33163985d.css — 200 — 1.4 KiB — 4 ms — h3https://link.springer.com/oscar-static/app-springerlink/css/enhanced-darwin-homepage-v2-eba3a4a270.css/oscar-static/app-springerlink/css/... https://link.springer.com/oscar-static/app-springerlink/css/enhanced-darwin-homepage-v2-eba3a4a270.css — 200 — 12.7 KiB — 5 ms — h3https://link.springer.com/oscar-static/images/darwin/header/img/logo-springer-nature-link-05805fde18.svg/oscar-static/images/darwin/header/... https://link.springer.com/oscar-static/images/darwin/header/img/logo-springer-nature-link-05805fde18.svg — 200 — 2.4 KiB — 9 ms — h3https://link.springer.com/oscar-static/images/homepage/homepage-hero-2x-ca4349cfac.webp/oscar-static/images/homepage/homep... https://link.springer.com/oscar-static/images/homepage/homepage-hero-2x-ca4349cfac.webp — 200 — 79.1 KiB — 9 ms — h3https://link.springer.com/oscar-static/images/springer-logo_75x20-eb38a969c0.svg/oscar-static/images/springer-logo_... https://link.springer.com/oscar-static/images/springer-logo_75x20-eb38a969c0.svg — 200 — 2.7 KiB — 3 ms — h3https://link.springer.com/oscar-static/images/homepage/logo-nature-portfolio-stacked-bbb8c01a8a.svg/oscar-static/images/homepage/logo-... https://link.springer.com/oscar-static/images/homepage/logo-nature-portfolio-stacked-bbb8c01a8a.svg — 200 — 2.6 KiB — 6 ms — h3https://link.springer.com/oscar-static/images/homepage/logo-bmc-no-whitespace-de4cbc81f4.svg/oscar-static/images/homepage/logo-... https://link.springer.com/oscar-static/images/homepage/logo-bmc-no-whitespace-de4cbc81f4.svg — 200 — 1.4 KiB — 4 ms — h3https://link.springer.com/oscar-static/images/homepage/logo-palgrave-macmillan-stacked-569307d56c.svg/oscar-static/images/homepage/logo-... https://link.springer.com/oscar-static/images/homepage/logo-palgrave-macmillan-stacked-569307d56c.svg — 200 — 2.4 KiB — 4 ms — h3https://link.springer.com/oscar-static/images/homepage/logo-discover-f3fb9af1e9.svg/oscar-static/images/homepage/logo-... https://link.springer.com/oscar-static/images/homepage/logo-discover-f3fb9af1e9.svg — 200 — 3.5 KiB — 13 ms — h3https://link.springer.com/oscar-static/images/apress-logo-d09c0bfc14.svg/oscar-static/images/apress-logo-d0... https://link.springer.com/oscar-static/images/apress-logo-d09c0bfc14.svg — 200 — 2.0 KiB — 13 ms — h3https://link.springer.com/oscar-static/js/polyfill-es5-bundle-f665f963ea.js/oscar-static/js/polyfill-es5-bundl... https://link.springer.com/oscar-static/js/polyfill-es5-bundle-f665f963ea.js — 200 — 23.0 KiB — 13 ms — h3https://cmp.springer.com/production_live/en/consent-bundle-17-72.jscmp.springer.com/production_live/en... https://cmp.springer.com/production_live/en/consent-bundle-17-72.js — 200 — 40.0 KiB — 35 ms — h2https://link.springer.com/oscar-static/app-springerlink/css/print-5e77550b92.css/oscar-static/app-springerlink/css/... https://link.springer.com/oscar-static/app-springerlink/css/print-5e77550b92.css — 200 — 704 B — 13 ms — h3https://cart.springer.com/cart-infocart.springer.com/cart-info https://cart.springer.com/cart-info — 200 — 216 B — 60 ms — h2https://link.springer.com/oscar-static/images/homepage/card-v1-1-2x-6603dfe502.webp/oscar-static/images/homepage/card-... https://link.springer.com/oscar-static/images/homepage/card-v1-1-2x-6603dfe502.webp — 200 — 15.3 KiB — 8 ms — h3https://link.springer.com/oscar-static/images/homepage/card-v1-2-2x-85be73814b.webp/oscar-static/images/homepage/card-... https://link.springer.com/oscar-static/images/homepage/card-v1-2-2x-85be73814b.webp — 200 — 35.3 KiB — 10 ms — h3https://link.springer.com/oscar-static/images/homepage/card-v1-3-2x-d6737434a1.webp/oscar-static/images/homepage/card-... https://link.springer.com/oscar-static/images/homepage/card-v1-3-2x-d6737434a1.webp — 200 — 31.9 KiB — 15 ms — h3https://link.springer.com/oscar-static/fonts/merriweather/subsets/latin/MerriweatherSans-Variable-Optimised-latin-subset-6a2bbc1ea4.woff2/oscar-static/fonts/merriweather/su... https://link.springer.com/oscar-static/fonts/merriweather/subsets/latin/MerriweatherSans-Variable-Optimised-latin-subset-6a2bbc1ea4.woff2 — 200 — 49.3 KiB — 12 ms — h3https://media.springernature.com/w326h183/springer-static/image/art%3A10.1038%2Fs41598-026-42534-8/MediaObjects/41598_2026_42534_Fig1_HTML.pngmedia.springernature.com/w326h183/s... https://media.springernature.com/w326h183/springer-static/image/art%3A10.1038%2Fs41598-026-42534-8/MediaObjects/41598_2026_42534_Fig1_HTML.png — 200 — 104.9 KiB — 52 ms — h2https://media.springernature.com/w326h183/springer-static/image/art%3A10.1038%2Fs43247-026-03283-8/MediaObjects/43247_2026_3283_Fig1_HTML.pngmedia.springernature.com/w326h183/s... https://media.springernature.com/w326h183/springer-static/image/art%3A10.1038%2Fs43247-026-03283-8/MediaObjects/43247_2026_3283_Fig1_HTML.png — 200 — 42.2 KiB — 48 ms — h2https://media.springernature.com/w326h183/springer-static/image/art%3A10.1186%2Fs12872-026-05762-4/MediaObjects/12872_2026_5762_Fig1_HTML.pngmedia.springernature.com/w326h183/s... https://media.springernature.com/w326h183/springer-static/image/art%3A10.1186%2Fs12872-026-05762-4/MediaObjects/12872_2026_5762_Fig1_HTML.png — 200 — 23.3 KiB — 53 ms — h2https://media.springernature.com/w326h183/springer-static/image/art%3A10.1038%2Fs42004-026-01942-7/MediaObjects/42004_2026_1942_Figa_HTML.pngmedia.springernature.com/w326h183/s... https://media.springernature.com/w326h183/springer-static/image/art%3A10.1038%2Fs42004-026-01942-7/MediaObjects/42004_2026_1942_Figa_HTML.png — 200 — 137.7 KiB — 54 ms — h2https://media.springernature.com/w326h183/springer-static/image/art%3A10.1007%2Fs40820-026-02109-8/MediaObjects/40820_2026_2109_Figa_HTML.pngmedia.springernature.com/w326h183/s... https://media.springernature.com/w326h183/springer-static/image/art%3A10.1007%2Fs40820-026-02109-8/MediaObjects/40820_2026_2109_Figa_HTML.png — 200 — 78.9 KiB — 52 ms — h2https://link.springer.com/oscar-static/js/base-es6-bundle-e6012746a2.js/oscar-static/js/base-es6-bundle-e6... https://link.springer.com/oscar-static/js/base-es6-bundle-e6012746a2.js — 200 — 8.6 KiB — 5 ms — h3https://cmp.springer.com/vendor-list.jsoncmp.springer.com/vendor-list.json https://cmp.springer.com/vendor-list.json — 200 — 37.9 KiB — 9 ms — h2https://sgtm.springer.com/gtm.js?id=GTM-MRVXSHQsgtm.springer.com/gtm.js?id=GTM-MRV... https://sgtm.springer.com/gtm.js?id=GTM-MRVXSHQ — 200 — 200.0 KiB — 219 ms — h2https://cdn.jsdelivr.net/npm/mathjax@2.7.5/MathJax.js?config=TeX-AMS-MML_SVG.jscdn.jsdelivr.net/npm/mathjax@2.7.5/... https://cdn.jsdelivr.net/npm/mathjax@2.7.5/MathJax.js?config=TeX-AMS-MML_SVG.js — 200 — 20.1 KiB — 42 ms — h2
0 ms 1.0 s 2.0 s 3.0 s FCP 2.2 s LCP 3.6 shttps://link.springer.com// https://link.springer.com/ — 303 — 656 B — 96 ms — h2https://idp.springer.com/authorize?response_type=cookie&client_id=springerlink&redirect_uri=https%3A%2F%2Flink.springer.com%2Fidp.springer.com/authorize?response... https://idp.springer.com/authorize?response_type=cookie&client_id=springerlink&redirect_uri=https%3A%2F%2Flink.springer.com%2F — 302 — 639 B — 49 ms — h2https://link.springer.com// https://link.springer.com/ — 200 — 49.1 KiB — 180 ms — h2https://link.springer.com/oscar-static/app-springerlink/css/core-darwin-e33163985d.css/oscar-static/app-springerlink/css/... https://link.springer.com/oscar-static/app-springerlink/css/core-darwin-e33163985d.css — 200 — 1.4 KiB — 4 ms — h3https://link.springer.com/oscar-static/app-springerlink/css/enhanced-darwin-homepage-v2-eba3a4a270.css/oscar-static/app-springerlink/css/... https://link.springer.com/oscar-static/app-springerlink/css/enhanced-darwin-homepage-v2-eba3a4a270.css — 200 — 12.7 KiB — 5 ms — h3https://link.springer.com/oscar-static/images/darwin/header/img/logo-springer-nature-link-05805fde18.svg/oscar-static/images/darwin/header/... https://link.springer.com/oscar-static/images/darwin/header/img/logo-springer-nature-link-05805fde18.svg — 200 — 2.4 KiB — 9 ms — h3https://link.springer.com/oscar-static/images/homepage/homepage-hero-2x-ca4349cfac.webp/oscar-static/images/homepage/homep... https://link.springer.com/oscar-static/images/homepage/homepage-hero-2x-ca4349cfac.webp — 200 — 79.1 KiB — 9 ms — h3https://link.springer.com/oscar-static/images/springer-logo_75x20-eb38a969c0.svg/oscar-static/images/springer-logo_... https://link.springer.com/oscar-static/images/springer-logo_75x20-eb38a969c0.svg — 200 — 2.7 KiB — 3 ms — h3https://link.springer.com/oscar-static/images/homepage/logo-nature-portfolio-stacked-bbb8c01a8a.svg/oscar-static/images/homepage/logo-... https://link.springer.com/oscar-static/images/homepage/logo-nature-portfolio-stacked-bbb8c01a8a.svg — 200 — 2.6 KiB — 6 ms — h3https://link.springer.com/oscar-static/images/homepage/logo-bmc-no-whitespace-de4cbc81f4.svg/oscar-static/images/homepage/logo-... https://link.springer.com/oscar-static/images/homepage/logo-bmc-no-whitespace-de4cbc81f4.svg — 200 — 1.4 KiB — 4 ms — h3https://link.springer.com/oscar-static/images/homepage/logo-palgrave-macmillan-stacked-569307d56c.svg/oscar-static/images/homepage/logo-... https://link.springer.com/oscar-static/images/homepage/logo-palgrave-macmillan-stacked-569307d56c.svg — 200 — 2.4 KiB — 4 ms — h3https://link.springer.com/oscar-static/images/homepage/logo-discover-f3fb9af1e9.svg/oscar-static/images/homepage/logo-... https://link.springer.com/oscar-static/images/homepage/logo-discover-f3fb9af1e9.svg — 200 — 3.5 KiB — 13 ms — h3https://link.springer.com/oscar-static/images/apress-logo-d09c0bfc14.svg/oscar-static/images/apress-logo-d0... https://link.springer.com/oscar-static/images/apress-logo-d09c0bfc14.svg — 200 — 2.0 KiB — 13 ms — h3https://link.springer.com/oscar-static/js/polyfill-es5-bundle-f665f963ea.js/oscar-static/js/polyfill-es5-bundl... https://link.springer.com/oscar-static/js/polyfill-es5-bundle-f665f963ea.js — 200 — 23.0 KiB — 13 ms — h3https://cmp.springer.com/production_live/en/consent-bundle-17-72.jscmp.springer.com/production_live/en... https://cmp.springer.com/production_live/en/consent-bundle-17-72.js — 200 — 40.0 KiB — 35 ms — h2https://link.springer.com/oscar-static/app-springerlink/css/print-5e77550b92.css/oscar-static/app-springerlink/css/... https://link.springer.com/oscar-static/app-springerlink/css/print-5e77550b92.css — 200 — 704 B — 13 ms — h3https://cart.springer.com/cart-infocart.springer.com/cart-info https://cart.springer.com/cart-info — 200 — 216 B — 60 ms 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— 23.0 KiB — 38 ms — h3https://link.springer.com/oscar-static/img/favicons/darwin/favicon-de0c289efe.ico/oscar-static/img/favicons/darwin/f... https://link.springer.com/oscar-static/img/favicons/darwin/favicon-de0c289efe.ico — 200 — 1.4 KiB — 4 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
63% of JavaScript execution is third-party
First-party Third-party 1475ms · 531KB · €8/mo
sgtm.springer.com
Other
Costly
Execution 533ms
Transfer 200 KB
Unused 34%
Monthly Cost €3/mo
Unattributable
Other
Costly
Execution 346ms
Transfer 0 KB
Monthly Cost €2/mo
cmp.springer.com
Other
Costly
Execution 248ms
Transfer 40 KB
Monthly Cost €1/mo
pagead2.googlesyndication.com
Other
Optional
Execution 168ms
Transfer 187 KB
Unused 76%
Monthly Cost €1/mo
jsDelivr
CDN
Optional
Execution 104ms
Transfer 70 KB
Unused 56%
Monthly Cost €1/mo
pagead2.googlesyndication.com
Other
Optional
Execution 77ms
Transfer 34 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • sgtm.springer.com adds 533ms and costs ~€3/month
  • Unattributable adds 346ms and costs ~€2/month
  • cmp.springer.com adds 248ms and costs ~€1/month

63% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

sgtm.springer.com takes 533ms 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 346ms 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

cmp.springer.com takes 248ms 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

76% of pagead2.googlesyndication.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

56% of jsDelivr'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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