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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
0
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
58
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.

0 ms

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

0 ms

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

0 ms

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

0.036

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

0 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

0 ms

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 3 REVIEW 4 FIX
F
Page Weight Budget
Action
12.5 MB transferred, 108 requests
FIX
12.5 MB transferred, 108 requests
Critical::
Page weighs 29.8 MB (12.5 MB transferred)
Info::
CSS is 10.9 MB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 10.9 MB
Warning::
JavaScript is 744 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 744 KB
Warning::
108 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.6 g CO2 per page load
12.5 MB / 2.4 MB budget
12.5 MB transferred
108 requests
2.6 g CO2 per page load
CSS 10.9 MiB 88%
JavaScript 744.0 KiB 6%
Images 724.1 KiB 6%
Fonts 53.1 KiB 0%
HTML 51.9 KiB 0%
Other 10.9 KiB 0%
Other 6.3 KiB 0%
Other 1.0 KiB 0%
0 2.4 MB 4.9 MB
Over budget

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (12.5 MiB of 12.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
108 resources · 12.5 MB · 0 KB savings available
FIX
108 resources · 12.5 MB · 0 KB savings available
Warning::
Page weight 11.5 MB over 1MB target
Got: 12.5 MB Expected: ≤ 1 MB
Warning::
107 third-party resources (100% of weight)
Info::
3 resources over 200KB
108 resources · 12.5 MiB · 107 third-party 11.5 MiB over 1MB target
CSS 88% · 10.9 MiB
JavaScript 6% · 744.0 KiB
Image 6% · 729.9 KiB
Font 0% · 53.1 KiB
Document 0% · 52.3 KiB
Other 0% · 11.9 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
76 images, 0 KB saveable
REVIEW
76 images, 0 KB saveable
Info::
All images are well-optimized
76 images 724 KB
0 oversized -0 KB
8 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1262ms total JS execution
REVIEW
1262ms total JS execution
Warning::
https://www.infoq.com/: 951ms CPU time
Info::
Unattributable: 123ms CPU time
Info::
https://cdn.infoq.com/statics_s1_20260421232814/sc...: 80ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-VMVP...: 57ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-W9G...: 51ms CPU time
Warning::
Third-party scripts: 1262ms (100% of total)

Main Thread Breakdown

Style & Layout 62% Other 16% Script Evaluation 14% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
https://www.infoq.com/951ms16ms4ms3rd
Unattributable123ms2ms0ms3rd
https://cdn.infoq.com/statics_s1_20260421232814/scripts/infoq.js80ms17ms8ms3rd
https://www.googletagmanager.com/gtag/js?id=G-VMVPD4D2JY&cx=c&gtm=4e64h157ms46ms10ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W9GJ5DL51ms41ms8ms3rd
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
3 fonts (53 KB)
PASS
3 fonts (53 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

53 KB total

Render-blocking

0

of 3

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 shttps://cdn.infoq.com/statics_s1_20260421232814/styles/fonts/va9B4kDNxMZdWfMOD5VnLK3eRhf6Xl7Glw.woff2va9B4kDNxMZdWfMOD5VnLK3... https://cdn.infoq.com/statics_s1_20260421232814/styles/fonts/va9B4kDNxMZdWfMOD5VnLK3eRhf6Xl7Glw.woff2 — 17.9 KiB — 16 ms — font-display: swaphttps://cdn.infoq.com/statics_s1_20260421232814/styles/fonts/va9B4kDNxMZdWfMOD5VnZKveRhf6Xl7Glw.woff2va9B4kDNxMZdWfMOD5VnZKv... https://cdn.infoq.com/statics_s1_20260421232814/styles/fonts/va9B4kDNxMZdWfMOD5VnZKveRhf6Xl7Glw.woff2 — 17.9 KiB — 17 ms — font-display: swaphttps://fonts.gstatic.com/s/firasans/v18/va9B4kDNxMZdWfMOD5VnLK3eRhf6Xl7Glw.woff2va9B4kDNxMZdWfMOD5VnLK3... https://fonts.gstatic.com/s/firasans/v18/va9B4kDNxMZdWfMOD5VnLK3eRhf6Xl7Glw.woff2 — 17.4 KiB — 36 ms — font-display: swap
va9B4kDNxMZdWfMOD5VnLK3... woff2 swap
Size 18 KB
Load time 16 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
va9B4kDNxMZdWfMOD5VnZKv... woff2 swap
Size 18 KB
Load time 17 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
va9B4kDNxMZdWfMOD5VnLK3... woff2 swap
Size 17 KB
Load time 36 ms
Start 1.9 s
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+
JS Bundles
10 scripts, 0 KB unused
PASS
10 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.infoq.com/statics_s1_20260421232814/scripts/combinedJs.min.js58 KB—✓3rd
https://cdn.infoq.com/statics_s1_20260421232814/scripts/relatedVcr.min.js6 KB—✓3rd
https://cdn.infoq.com/statics_s1_20260421232814/scripts/infoq.js115 KB—✓3rd
https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js3 KB—✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W9GJ5DL129 KB—✓3rd
https://www.googletagmanager.com/gtag/js?id=G-VMVPD4D2JY&cx=c&gtm=4e64h1159 KB—✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB—✓3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js123 KB—✓3rd
https://cdn.infoq.com/statics_s1_20260421232814/scripts/lib/browser-update-org/update.js7 KB—✓3rd
https://connect.facebook.net/signals/config/842388869148196?v=2.9.303&r=stable&domain=www.infoq.com&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C16847 KB—✓3rd
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
108 requests over 2600ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 shttps://infoq.com// https://infoq.com/ — 301 — 484 B — 529 ms — h2https://www.infoq.com/www.infoq.com/ https://www.infoq.com/ — 200 — 41.3 KiB — 606 ms — h2https://cdn.infoq.com/statics_s1_20260421232814/styles/style.csscdn.infoq.com/statics_s1_2026042123... https://cdn.infoq.com/statics_s1_20260421232814/styles/style.css — 200 — 968.9 KiB — 66 ms — h2https://cdn.infoq.com/statics_s1_20260421232814/styles/style_en.csscdn.infoq.com/statics_s1_2026042123... https://cdn.infoq.com/statics_s1_20260421232814/styles/style_en.css — 200 — 609 B — 31 ms — h2https://cdn.infoq.com/statics_s1_20260421232814/styles/icons.csscdn.infoq.com/statics_s1_2026042123... https://cdn.infoq.com/statics_s1_20260421232814/styles/icons.css — 200 — 10.0 MiB — 380 ms — h2https://cdn.infoq.com/statics_s1_20260421232814/styles/style_extra.csscdn.infoq.com/statics_s1_2026042123... https://cdn.infoq.com/statics_s1_20260421232814/styles/style_extra.css — 200 — 1.6 KiB — 59 ms — h2https://cdn.infoq.com/statics_s1_20260421232814/styles/fonts/font.csscdn.infoq.com/statics_s1_2026042123... https://cdn.infoq.com/statics_s1_20260421232814/styles/fonts/font.css — 200 — 947 B — 60 ms — h2https://cdn.infoq.com/statics_s1_20260421232814/scripts/combinedJs.min.jscdn.infoq.com/statics_s1_2026042123... https://cdn.infoq.com/statics_s1_20260421232814/scripts/combinedJs.min.js — 200 — 58.4 KiB — 60 ms — h2https://cdn.infoq.com/statics_s1_20260421232814/scripts/relatedVcr.min.jscdn.infoq.com/statics_s1_2026042123... https://cdn.infoq.com/statics_s1_20260421232814/scripts/relatedVcr.min.js — 200 — 5.7 KiB — 60 ms — h2https://cdn.infoq.com/statics_s1_20260421232814/scripts/infoq.jscdn.infoq.com/statics_s1_2026042123... https://cdn.infoq.com/statics_s1_20260421232814/scripts/infoq.js — 200 — 115.4 KiB — 59 ms — h2https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.jsplausible.io/js/script.file-downloa... https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js — 200 — 2.8 KiB — 34 ms — h2https://www.infoq.com/vendorcontent/loadVcrs.actionwww.infoq.com/vendorcontent/loadVcr... https://www.infoq.com/vendorcontent/loadVcrs.action — 200 — 10.3 KiB — 325 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-W9GJ5DLwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-W9GJ5DL — 200 — 128.7 KiB — 173 ms — h2https://cdn.infoq.com/statics_s1_20260421232814/styles/print.csscdn.infoq.com/statics_s1_2026042123... https://cdn.infoq.com/statics_s1_20260421232814/styles/print.css — 200 — 1.4 KiB — 60 ms — h2data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='10' height='7' viewBox='0 0 10 …www.w3.org/2000/svg' width='10' hei... data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='10' height='7' viewBox='0 0 10 … — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3csvg height='28' viewBox='0 0 92 28' width='92' xmlns='http://www.w3.org/2000/…www.w3.org/2000/… data:image/svg+xml,%3csvg height='28' viewBox='0 0 92 28' width='92' xmlns='http://www.w3.org/2000/… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='10' height='7' viewBox='0 0 10 …www.w3.org/2000/svg' width='10' hei... data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='10' height='7' viewBox='0 0 10 … — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3csvg fill='none' height='12' viewBox='0 0 12 12' width='12' xmlns='http://www.…www.… data:image/svg+xml,%3csvg fill='none' height='12' viewBox='0 0 12 12' width='12' xmlns='http://www.… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3csvg height='31' viewBox='0 0 100 31' width='100' xmlns='http://www.w3.org/200…www.w3.org/200… data:image/svg+xml,%3csvg height='31' viewBox='0 0 100 31' width='100' xmlns='http://www.w3.org/200… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3csvg fill='none' height='12' viewBox='0 0 12 12' width='12' xmlns='http://www.…www.… data:image/svg+xml,%3csvg fill='none' height='12' viewBox='0 0 12 12' width='12' xmlns='http://www.… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3csvg fill='none' height='12' viewBox='0 0 12 12' width='12' xmlns='http://www.…www.… data:image/svg+xml,%3csvg fill='none' height='12' viewBox='0 0 12 12' width='12' xmlns='http://www.… — 200 — 0 B — 0 ms — datahttps://imgopt.infoq.com/fit-in/100x100/filters:quality(80)/presentations/game-vr-flat-screens/en/smallimage/thumbnail-1775637585504.jpgimgopt.infoq.com/fit-in/100x100/fil... https://imgopt.infoq.com/fit-in/100x100/filters:quality(80)/presentations/game-vr-flat-screens/en/smallimage/thumbnail-1775637585504.jpg — 200 — 6.0 KiB — 33 ms — h2https://imgopt.infoq.com/fit-in/100x100/filters:quality(80)/presentations/patterns-payment-system/en/smallimage/thumbnail-1775049482922.jpgimgopt.infoq.com/fit-in/100x100/fil... https://imgopt.infoq.com/fit-in/100x100/filters:quality(80)/presentations/patterns-payment-system/en/smallimage/thumbnail-1775049482922.jpg — 200 — 2.6 KiB — 34 ms — h2https://imgopt.infoq.com/fit-in/100x100/filters:quality(80)/presentations/llm-personalization/en/smallimage/Sudeep-Das-Pradeep-Muthukrishnan-thumbnail-1776173227456.jpgimgopt.infoq.com/fit-in/100x100/fil... https://imgopt.infoq.com/fit-in/100x100/filters:quality(80)/presentations/llm-personalization/en/smallimage/Sudeep-Das-Pradeep-Muthukrishnan-thumbnail-1776173227456.jpg — 200 — 3.5 KiB — 35 ms — h2https://imgopt.infoq.com/fit-in/100x100/filters:quality(80)/presentations/open-source-dependencies/en/smallimage/celine-pypaert-thumbnail-1775047335370.jpegimgopt.infoq.com/fit-in/100x100/fil... https://imgopt.infoq.com/fit-in/100x100/filters:quality(80)/presentations/open-source-dependencies/en/smallimage/celine-pypaert-thumbnail-1775047335370.jpeg — 200 — 2.8 KiB — 36 ms — h2https://imgopt.infoq.com/fit-in/100x100/filters:quality(80)/articles/enterprise-grade-observability-extension-docker/en/smallimage/enterprise-grade-observability-extension-docker-thumbnail-1775560652994.jpgimgopt.infoq.com/fit-in/100x100/fil... https://imgopt.infoq.com/fit-in/100x100/filters:quality(80)/articles/enterprise-grade-observability-extension-docker/en/smallimage/enterprise-grade-observability-extension-docker-thumbnail-1775560652994.jpg — 200 — 9.7 KiB — 39 ms — h2https://imgopt.infoq.com/eyJidWNrZXQiOiAiYXNzZXRzLmluZm9xLmNvbSIsImtleSI6ICJ3ZWIvaGVhZGVyL2NvbmZlcmVuY2VzLzIwMjYvT25saW5lQ29ob3J0c01hcmNoMjAyNi10b3AtdjQuanBnIiwiZWRpdHMiOiB7IndlYnAiOiB7ICJxdWFsaXR5Ijo4MH19fQ==imgopt.infoq.com/eyJidWNrZXQiOiAiYX... https://imgopt.infoq.com/eyJidWNrZXQiOiAiYXNzZXRzLmluZm9xLmNvbSIsImtleSI6ICJ3ZWIvaGVhZGVyL2NvbmZlcmVuY2VzLzIwMjYvT25saW5lQ29ob3J0c01hcmNoMjAyNi10b3AtdjQuanBnIiwiZWRpdHMiOiB7IndlYnAiOiB7ICJxdWFsaXR5Ijo4MH19fQ== — 200 — 2.7 KiB — 44 ms — h2https://cdn.infoq.com/statics_s1_20260421232814/styles/fonts/va9B4kDNxMZdWfMOD5VnLK3eRhf6Xl7Glw.woff2cdn.infoq.com/statics_s1_2026042123... https://cdn.infoq.com/statics_s1_20260421232814/styles/fonts/va9B4kDNxMZdWfMOD5VnLK3eRhf6Xl7Glw.woff2 — 200 — 17.9 KiB — 16 ms — h2https://cdn.infoq.com/statics_s1_20260421232814/styles/fonts/va9B4kDNxMZdWfMOD5VnZKveRhf6Xl7Glw.woff2cdn.infoq.com/statics_s1_2026042123... https://cdn.infoq.com/statics_s1_20260421232814/styles/fonts/va9B4kDNxMZdWfMOD5VnZKveRhf6Xl7Glw.woff2 — 200 — 17.9 KiB — 17 ms — h2https://imgopt.infoq.com/eyJidWNrZXQiOiAiYXNzZXRzLmluZm9xLmNvbSIsImtleSI6ICJ3ZWIvaGVhZGVyL2NvbmZlcmVuY2VzLzIwMjYvUUNvbi1BSS1Cb3N0b24tMjAyNi10b3AuanBnIiwiZWRpdHMiOiB7IndlYnAiOiB7ICJxdWFsaXR5Ijo4MH19fQ==imgopt.infoq.com/eyJidWNrZXQiOiAiYX... https://imgopt.infoq.com/eyJidWNrZXQiOiAiYXNzZXRzLmluZm9xLmNvbSIsImtleSI6ICJ3ZWIvaGVhZGVyL2NvbmZlcmVuY2VzLzIwMjYvUUNvbi1BSS1Cb3N0b24tMjAyNi10b3AuanBnIiwiZWRpdHMiOiB7IndlYnAiOiB7ICJxdWFsaXR5Ijo4MH19fQ== — 200 — 2.4 KiB — 98 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 shttps://infoq.com// https://infoq.com/ — 301 — 484 B — 529 ms — h2https://www.infoq.com/www.infoq.com/ https://www.infoq.com/ — 200 — 41.3 KiB — 606 ms — h2https://cdn.infoq.com/statics_s1_20260421232814/styles/style.csscdn.infoq.com/statics_s1_2026042123... https://cdn.infoq.com/statics_s1_20260421232814/styles/style.css — 200 — 968.9 KiB — 66 ms — h2https://cdn.infoq.com/statics_s1_20260421232814/styles/style_en.csscdn.infoq.com/statics_s1_2026042123... https://cdn.infoq.com/statics_s1_20260421232814/styles/style_en.css — 200 — 609 B — 31 ms — h2https://cdn.infoq.com/statics_s1_20260421232814/styles/icons.csscdn.infoq.com/statics_s1_2026042123... https://cdn.infoq.com/statics_s1_20260421232814/styles/icons.css — 200 — 10.0 MiB — 380 ms — h2https://cdn.infoq.com/statics_s1_20260421232814/styles/style_extra.csscdn.infoq.com/statics_s1_2026042123... https://cdn.infoq.com/statics_s1_20260421232814/styles/style_extra.css — 200 — 1.6 KiB — 59 ms — 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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 1262ms · 445KB · €14/mo
www.infoq.com
Other
Costly
Execution 951ms
Transfer 41 KB
Monthly Cost €10/mo
Unattributable
Other
Optional
Execution 123ms
Transfer 0 KB
Monthly Cost €1/mo
cdn.infoq.com
Other
Optional
Execution 80ms
Transfer 115 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 57ms
Transfer 159 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 51ms
Transfer 129 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.infoq.com adds 951ms and costs ~€10/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.infoq.com takes 951ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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