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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
4
REVIEW
2
PASS
7
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.
89
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.47 s

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

2.43 s

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

193 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.

1.76 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.

4.38 s

Page Load Progression

598 ms
1.2 s
1.8 s
2.4 s
3.0 s
3.6 s
4.2 s
4.8 s
Checks
15
7 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
4.1 MB transferred, 133 requests
FIX
4.1 MB transferred, 133 requests
Critical::
Page weighs 9.6 MB (4.1 MB transferred)
Warning::
JavaScript is 2.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.1 MB
Info::
Fonts are 397 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 397 KB
Warning::
133 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.85 g CO2 per page load
4.1 MB / 2.4 MB budget
4.1 MB transferred
133 requests
0.85 g CO2 per page load
JavaScript 2.1 MiB 51%
Other 882.9 KiB 21%
Images 591.0 KiB 14%
Fonts 396.6 KiB 10%
CSS 56.6 KiB 1%
Other 50.0 KiB 1%
HTML 40.8 KiB 1%
Other 9.9 KiB 0%
Other 5.4 KiB 0%
Other 558 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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 (4.1 MiB of 4.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
34 scripts, 436 KB unused
FIX
34 scripts, 436 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5P4...: 73 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-092E...: 66 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202408.1...: 63 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.qualified.com/qualified.js?token=pjWpuK...: 57 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.qualified.com/packs/js/multimodal_v2-3f...: 50 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 436 KB
436 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-5P4V6Z172 KB73 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-092EL089CH&cx=c&gtm=4e64h1169 KB66 KB (39%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202408.1.0/otBannerSdk.js111 KB63 KB (57%)✓3rd
https://js.qualified.com/qualified.js?token=pjWpuKm8Qxr4Xa9U117 KB57 KB (49%)✓3rd
https://js.qualified.com/packs/js/multimodal_v2-3fbc98a7.js97 KB50 KB (52%)✓3rd
https://www.oreilly.com/KxXuCyduA3/oq/qtiMwY_O/uXrEVzLwhDD0Nr/aE0gZA/Cxp/8IWwsPSEB175 KB37 KB (21%)✓3rd
https://www.oreilly.com/KxXuCyduA3/oq/qtiMwY_O/X0rEVzzE/MmwmZA/Dnk/hAzciHEsPAg?v=6d6ef506-a6fe-dd73-4ad0-107c296db832160 KB33 KB (21%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB33 KB (34%)✓3rd
https://www.oreilly.com/radar/wp-content/cache/minify/3/2b57e.js35 KB24 KB (70%)✓3rd
https://snap.licdn.com/li.lms-analytics/insight.min.js19 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
133 resources · 4.1 MB · 436 KB savings available
FIX
133 resources · 4.1 MB · 436 KB savings available
Warning::
Page weight 3.1 MB over 1MB target
Got: 4.1 MB Expected: ≤ 1 MB
Info::
~436 KB of savings available
Warning::
132 third-party resources (100% of weight)
Info::
3 resources over 200KB
133 resources · 4.1 MiB · 132 third-party 3.1 MiB over 1MB target
JavaScript 51% · 2.1 MiB
Media 21% · 882.9 KiB
Image 14% · 594.9 KiB
Font 10% · 396.6 KiB
CSS 1% · 60.9 KiB
Other 1% · 54.4 KiB
Document 1% · 41.4 KiB

~436.4 KiB of savings available

Remove unused JavaScript: 436.4 KiB
C
Image Optimization
Action
53 images, 0 KB saveable
REVIEW
53 images, 0 KB saveable
Warning::
https://cdn.oreillystatic.com/oreilly/images/googl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.oreillystatic.com/images/sitewide-head... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.oreillystatic.com/oreilly/images/amazo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.oreillystatic.com/oreilly/images/app-s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.oreillystatic.com/oreilly/images/roku-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
53 images 591 KB
0 oversized -0 KB
52 legacy format
5 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

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
1724ms total JS execution
REVIEW
1724ms total JS execution
Warning::
Unattributable: 351ms CPU time
Warning::
https://www.oreilly.com/radar/: 315ms CPU time
Warning::
https://www.oreilly.com/KxXuCyduA3/oq/qtiMwY_O/uXr...: 265ms CPU time
Info::
https://www.oreilly.com/KxXuCyduA3/oq/qtiMwY_O/X0r...: 242ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-5P4...: 169ms CPU time
Warning::
Third-party scripts: 1724ms (100% of total)

Main Thread Breakdown

Script Evaluation 60% Other 17% Style & Layout 9% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
Unattributable351ms85ms0ms3rd
https://www.oreilly.com/radar/315ms20ms7ms3rd
https://www.oreilly.com/KxXuCyduA3/oq/qtiMwY_O/uXrEVzLwhDD0Nr/aE0gZA/Cxp/8IWwsPSEB265ms222ms20ms3rd
https://www.oreilly.com/KxXuCyduA3/oq/qtiMwY_O/X0rEVzzE/MmwmZA/Dnk/hAzciHEsPAg?v=6d6ef506-a6fe-dd73-4ad0-107c296db832242ms218ms17ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5P4V6Z169ms131ms20ms3rd
https://www.googletagmanager.com/gtag/js?id=G-092EL089CH&cx=c&gtm=4e64h1127ms106ms18ms3rd
https://js.qualified.com/qualified.js?token=pjWpuKm8Qxr4Xa9U119ms98ms14ms3rd
https://cdn.cookielaw.org/scripttemplates/202408.1.0/otBannerSdk.js78ms57ms15ms3rd
https://connect.facebook.net/signals/config/2748629762194855?v=2.9.303&r=stable&domain=www.oreilly.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%2C16859ms51ms7ms3rd
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
9 fonts (397 KB)
PASS
9 fonts (397 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

397 KB total

Render-blocking

0

of 9

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 4.0 s FCP 1.5 s LCP 2.4 shttps://cdn.oreillystatic.com/fonts/GuardianText/GuardianTextSans-Regular-Web.woff2GuardianTextSans-Regula... https://cdn.oreillystatic.com/fonts/GuardianText/GuardianTextSans-Regular-Web.woff2 — 35.9 KiB — 42 ms — font-display: swaphttps://cdn.oreillystatic.com/fonts/Gilroy/Family/gilroy-bold.woff2gilroy-bold.woff2 https://cdn.oreillystatic.com/fonts/Gilroy/Family/gilroy-bold.woff2 — 21.6 KiB — 53 ms — font-display: swaphttps://cdn.oreillystatic.com/fonts/GuardianText/GuardianTextSans-Medium-Web.woff2GuardianTextSans-Medium... https://cdn.oreillystatic.com/fonts/GuardianText/GuardianTextSans-Medium-Web.woff2 — 35.7 KiB — 56 ms — font-display: swaphttps://cdn.oreillystatic.com/fonts/GuardianText/GuardianTextSans-RegularIt-Web.woff2GuardianTextSans-Regula... https://cdn.oreillystatic.com/fonts/GuardianText/GuardianTextSans-RegularIt-Web.woff2 — 40.2 KiB — 900 ms — font-display: swaphttps://cdn.oreillystatic.com/fonts/Gilroy/Family/gilroy-semibold.woff2gilroy-semibold.woff2 https://cdn.oreillystatic.com/fonts/Gilroy/Family/gilroy-semibold.woff2 — 21.2 KiB — 66 ms — font-display: swaphttps://cdn.oreillystatic.com/fonts/Gilroy/Family/gilroy-light.woff2gilroy-light.woff2 https://cdn.oreillystatic.com/fonts/Gilroy/Family/gilroy-light.woff2 — 20.4 KiB — 67 ms — font-display: swaphttps://cdn.oreillystatic.com/fonts/Gilroy/Family/gilroy-regular.woff2gilroy-regular.woff2 https://cdn.oreillystatic.com/fonts/Gilroy/Family/gilroy-regular.woff2 — 20.8 KiB — 50 ms — font-display: swaphttps://assets.qualified.com/packs/media/Inter-Regular.f1f0c35b.woff2Inter-Regular.f1f0c35b.... https://assets.qualified.com/packs/media/Inter-Regular.f1f0c35b.woff2 — 96.9 KiB — 35 ms — font-display: swaphttps://assets.qualified.com/packs/media/Inter-SemiBold.fcb100c7.woff2Inter-SemiBold.fcb100c7... https://assets.qualified.com/packs/media/Inter-SemiBold.fcb100c7.woff2 — 104.0 KiB — 34 ms — font-display: swap
GuardianTextSans-Regula... woff2 swap
Size 36 KB
Load time 42 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
gilroy-bold.woff2 woff2 swap
Size 22 KB
Load time 53 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
GuardianTextSans-Medium... woff2 swap
Size 36 KB
Load time 56 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
GuardianTextSans-Regula... woff2 swap
Size 40 KB
Load time 900 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
gilroy-semibold.woff2 woff2 swap
Size 21 KB
Load time 66 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
gilroy-light.woff2 woff2 swap
Size 20 KB
Load time 67 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
gilroy-regular.woff2 woff2 swap
Size 21 KB
Load time 50 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
Inter-Regular.f1f0c35b.... woff2 swap
Size 97 KB
Load time 35 ms
Start 4.1 s
Risk FOUT — text flashes from fallback to web font
Inter-SemiBold.fcb100c7... woff2 swap
Size 104 KB
Load time 34 ms
Start 4.1 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~52 KB and ~104 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

A
HTTP Caching
max-age=2592000 (4 weeks)
PASS
max-age=2592000 (4 weeks)
Info::
Cache-Control header is set
Got: max-age=2592000
Info::
Effective TTL: 4 weeks (max-age=2592000)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=2592000

DirectiveValueMeaning
max-age2592000Cache for 4 weeks
Effective TTL: 2592000 seconds
Network Waterfall
133 requests over 7105ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 1.5 s LCP 2.4 shttps://onlamp.com// https://onlamp.com/ — 301 — 323 B — 482 ms — http/1.1https://www.oreilly.com/radar/www.oreilly.com/radar/ https://www.oreilly.com/radar/ — 200 — 37.6 KiB — 66 ms — h2https://www.oreilly.com/radar/wp-content/themes/signal/style.css?ver=1775744389www.oreilly.com/radar/wp-content/th... https://www.oreilly.com/radar/wp-content/themes/signal/style.css?ver=1775744389 — 200 — 18.8 KiB — 31 ms — h2https://www.oreilly.com/radar/wp-content/cache/minify/3/2b57e.jswww.oreilly.com/radar/wp-content/ca... https://www.oreilly.com/radar/wp-content/cache/minify/3/2b57e.js — 200 — 34.8 KiB — 31 ms — h2https://www.oreilly.com/radar/wp-content/themes/signal/files/marketing-cloud-subscribe-20220726.csswww.oreilly.com/radar/wp-content/th... https://www.oreilly.com/radar/wp-content/themes/signal/files/marketing-cloud-subscribe-20220726.css — 200 — 1.8 KiB — 29 ms — h2https://cdn.oreillystatic.com/assets/js/marketingCloudForm-20250502.jscdn.oreillystatic.com/assets/js/mar... https://cdn.oreillystatic.com/assets/js/marketingCloudForm-20250502.js — 200 — 2.8 KiB — 557 ms — h2https://www.oreilly.com/radar/wp-content/cache/minify/3/52453.jswww.oreilly.com/radar/wp-content/ca... https://www.oreilly.com/radar/wp-content/cache/minify/3/52453.js — 200 — 2.6 KiB — 25 ms — h2https://cdn.oreillystatic.com/oreilly/images/app-store-logo.pngcdn.oreillystatic.com/oreilly/image... https://cdn.oreillystatic.com/oreilly/images/app-store-logo.png — 200 — 11.1 KiB — 61 ms — h2https://cdn.oreillystatic.com/oreilly/images/google-play-logo.pngcdn.oreillystatic.com/oreilly/image... https://cdn.oreillystatic.com/oreilly/images/google-play-logo.png — 200 — 9.0 KiB — 62 ms — h2https://cdn.oreillystatic.com/assets/css/2025_font_face.csscdn.oreillystatic.com/assets/css/20... https://cdn.oreillystatic.com/assets/css/2025_font_face.css — 200 — 939 B — 523 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 1724ms · 813KB · $23/mo
Unattributable
Other
Costly
Execution 351ms
Transfer 0 KB
Monthly Cost $5/mo
www.oreilly.com
Other
Costly
Execution 315ms
Transfer 38 KB
Monthly Cost $4/mo
www.oreilly.com
Other
Costly
Execution 265ms
Transfer 1 KB
Unused 21%
Monthly Cost $4/mo
www.oreilly.com
Other
Costly
Execution 242ms
Transfer 160 KB
Unused 21%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 169ms
Transfer 172 KB
Unused 43%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 127ms
Transfer 169 KB
Unused 39%
Monthly Cost $2/mo
js.qualified.com
Other
Optional
Execution 119ms
Transfer 117 KB
Unused 49%
Monthly Cost $2/mo
OneTrust
Consent
Essential
Execution 78ms
Transfer 111 KB
Unused 57%
Monthly Cost $1/mo
Facebook Pixel
Advertising
Optional
Execution 59ms
Transfer 46 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 351ms and costs ~$5/month
  • www.oreilly.com adds 315ms and costs ~$4/month
  • www.oreilly.com adds 265ms and costs ~$4/month
  • www.oreilly.com adds 242ms and costs ~$3/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

Unattributable takes 351ms 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.oreilly.com takes 315ms 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.oreilly.com takes 265ms 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.oreilly.com takes 242ms 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 OneTrust'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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