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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
66
GRADE
D
FIX
5
REVIEW
1
PASS
7
INFO
2

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

Mobile Desktop
74
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
87
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.

1.27 s

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

2.22 s

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

232 ms

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

0.003

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

1.89 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.

5.16 s

Page Load Progression

532 ms
1.1 s
1.6 s
2.1 s
2.7 s
3.2 s
3.7 s
4.3 s
Checks
15
7 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
5.1 MB transferred, 118 requests
FIX
5.1 MB transferred, 118 requests
Critical::
Page weighs 20.9 MB (5.1 MB transferred)
Warning::
JavaScript is 2.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.5 MB
Warning::
Images are 2.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.3 MB
Warning::
118 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.1 g CO2 per page load
5.1 MB / 2.4 MB budget
5.1 MB transferred
118 requests
1.1 g CO2 per page load
JavaScript 2.5 MiB 48%
Images 2.3 MiB 44%
Fonts 169.6 KiB 3%
Other 157.3 KiB 3%
HTML 42.4 KiB 1%
CSS 31.3 KiB 1%
Other 9.8 KiB 0%
Other 3.3 KiB 0%
Other 2.2 KiB 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

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

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 (5.1 MiB of 5.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2673ms total JS execution
FIX
2673ms total JS execution
Warning::
https://cdnapisec.kaltura.com/html5/html5lib/v2.86...: 824ms CPU time
Warning::
Unattributable: 446ms CPU time
Warning::
https://www.oreilly.com/: 409ms CPU time
Warning::
https://cdnapisec.kaltura.com/html5/html5lib/v2.86...: 263ms CPU time
Info::
https://www.oreilly.com/KxXuCyduA3/oq/qtiMwY_O/X0r...: 239ms CPU time
Warning::
Third-party scripts: 2673ms (100% of total)

Main Thread Breakdown

Script Evaluation 58% Other 14% Script Parsing & Compilation 14% Style & Layout 8%
ScriptTotalScriptingParse/CompileParty
https://cdnapisec.kaltura.com/html5/html5lib/v2.86/load.php?debug=false&lang=en&modules=Hlsjs%2CPolyfill_Set%2CacCheck%2CacPreview%2Cbase64_decode%2Cbase64_encode%2Cclass%2CcontrolBarContainer%2CcurrentTimeLabel%2CdurationLabel%2CfullScreenBtn%2Cid3Tag%2CkAnalony%2Ckdark%2CkeyboardShortcuts%2CkgitGuard%2ClargePlayBtn%2CliveStream%2CmatchMedia%2CmorePlugins%2CnativeBridge%2CplayPauseBtn%2Cpolyfill_Array_filter%2CqualitySettings%2CreportError%2Cscreenfull%2Cscrubber%2CsideBarContainer%2CsourceSelector%2Ctheme%2CtopBarContainer%2CunMuteOverlayButton%2Cutf8_encode%2CvolumeControl%7Cjquery.client%2Ccolor%2Ccookie%2Cdebouncedresize%2ChoverIntent%2CmessageBox%2CmwEmbedUtil%2CmwExtension%2CnaturalSize%7Cjquery.ui.core%2Cmouse%2Cposition%2Cslider%2Ctooltip%2CtouchPunch%2Cwidget%7Cmediawiki.Uri%2CUtilitiesTime%2CUtilitiesUrl%2Cclient%2CjqueryMsg%2Ckmenu%2Clanguage%2Cutil%7Cmediawiki.util.tmpl%7Cmw.EmbedPlayer%2CEmbedPlayerImageOverlay%2CEmbedPlayerKplayer%2CEmbedPlayerNative%2CEmbedPlayerNativeComponent%2CEmbedTypes%2CKBaseButton%2CKBaseComponent%2CKBasePlugin%2CKBaseSmartContainer%2CKCuePoints%2CKDPMapping%2CKEntryLoader%2CKWidgetSupport%2CKalturaIframePlayerSetup%2CMediaElement%2CMediaPlayer%2CMediaPlayers%2CMediaSource%2CPlayerElement%2CPlayerElementFlash%2CPlayerElementHTML%2CPluginManager%7Cmw.MwEmbedSupport.style&pskwidgetpath=..%2Fkwidget-ps%2F&skin=no-theme&version=20260421T130225Z&*&protocol=https&wid=_1681692824ms557ms220ms3rd
Unattributable446ms127ms0ms3rd
https://www.oreilly.com/409ms57ms4ms3rd
https://cdnapisec.kaltura.com/html5/html5lib/v2.86/load.php?debug=false&lang=en&modules=Hlsjs%2CPolyfill_Set%2CacCheck%2CacPreview%2Cbase64_decode%2Cbase64_encode%2Cclass%2CcontrolBarContainer%2CcurrentTimeLabel%2CdurationLabel%2CfullScreenBtn%2Cid3Tag%2CkAnalony%2Ckdark%2CkeyboardShortcuts%2CkgitGuard%2ClargePlayBtn%2CliveStream%2CmatchMedia%2CmorePlugins%2CnativeBridge%2CplayPauseBtn%2Cpolyfill_Array_filter%2CqualitySettings%2CreportError%2Cscreenfull%2Cscrubber%2CsideBarContainer%2CsourceSelector%2Ctheme%2CtopBarContainer%2CunMuteOverlayButton%2Cutf8_encode%2CvolumeControl%7Cjquery.client%2Ccolor%2Ccookie%2Cdebouncedresize%2ChoverIntent%2CmessageBox%2CmwEmbedUtil%2CmwExtension%2CnaturalSize%7Cjquery.ui.core%2Cmouse%2Cposition%2Cslider%2Ctooltip%2CtouchPunch%2Cwidget%7Cmediawiki.Uri%2CUtilitiesTime%2CUtilitiesUrl%2Cclient%2CjqueryMsg%2Ckmenu%2Clanguage%2Cutil%7Cmediawiki.util.tmpl%7Cmw.EmbedPlayer%2CEmbedPlayerImageOverlay%2CEmbedPlayerKplayer%2CEmbedPlayerNative%2CEmbedPlayerNativeComponent%2CEmbedTypes%2CKBaseButton%2CKBaseComponent%2CKBasePlugin%2CKBaseSmartContainer%2CKCuePoints%2CKDPMapping%2CKEntryLoader%2CKWidgetSupport%2CKalturaIframePlayerSetup%2CMediaElement%2CMediaPlayer%2CMediaPlayers%2CMediaSource%2CPlayerElement%2CPlayerElementFlash%2CPlayerElementHTML%2CPluginManager%7Cmw.MwEmbedSupport.style&pskwidgetpath=..%2Fkwidget-ps%2F&skin=no-theme&version=20260419T085420Z&*&protocol=https&wid=_1681692263ms198ms53ms3rd
https://www.oreilly.com/KxXuCyduA3/oq/qtiMwY_O/X0rEVzzE/MmwmZA/FCQ/hVwwjR1EPAg?v=a813589d-8d12-d213-fdfe-fb6116870214239ms217ms13ms3rd
https://www.oreilly.com/KxXuCyduA3/oq/qtiMwY_O/uXrEVzLwhDD0Nr/aE0gZA/Cxp/8IWwsPSEB229ms213ms13ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5P4V6Z122ms100ms15ms3rd
https://cdn.cookielaw.org/scripttemplates/202408.1.0/otBannerSdk.js80ms49ms14ms3rd
https://www.googletagmanager.com/gtag/js?id=G-092EL089CH&cx=c&gtm=4e64h160ms48ms11ms3rd
F
JS Bundles
Action
26 scripts, 2.2 MB unused
FIX
26 scripts, 2.2 MB unused
Warning::
https://cdnapisec.kaltura.com/html5/html5lib/v2.86...: 478 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdnapisec.kaltura.com/html5/html5lib/v2.86...: 478 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdnapisec.kaltura.com/html5/html5lib/v2.86...: 478 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdnapisec.kaltura.com/html5/html5lib/v2.86...: 478 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-092E...: 77 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 2.2 MB
2235 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdnapisec.kaltura.com/html5/html5lib/v2.86/load.php?debug=false&lang=en&modules=Hlsjs%2CPolyfill_Set%2CacCheck%2CacPreview%2Cbase64_decode%2Cbase64_encode%2Cclass%2CcontrolBarContainer%2CcurrentTimeLabel%2CdurationLabel%2CfullScreenBtn%2Cid3Tag%2CkAnalony%2Ckdark%2CkeyboardShortcuts%2CkgitGuard%2ClargePlayBtn%2CliveStream%2CmatchMedia%2CmorePlugins%2CnativeBridge%2CplayPauseBtn%2Cpolyfill_Array_filter%2CqualitySettings%2CreportError%2Cscreenfull%2Cscrubber%2CsideBarContainer%2CsourceSelector%2Ctheme%2CtopBarContainer%2CunMuteOverlayButton%2Cutf8_encode%2CvolumeControl%7Cjquery.client%2Ccolor%2Ccookie%2Cdebouncedresize%2ChoverIntent%2CmessageBox%2CmwEmbedUtil%2CmwExtension%2CnaturalSize%7Cjquery.ui.core%2Cmouse%2Cposition%2Cslider%2Ctooltip%2CtouchPunch%2Cwidget%7Cmediawiki.Uri%2CUtilitiesTime%2CUtilitiesUrl%2Cclient%2CjqueryMsg%2Ckmenu%2Clanguage%2Cutil%7Cmediawiki.util.tmpl%7Cmw.EmbedPlayer%2CEmbedPlayerImageOverlay%2CEmbedPlayerKplayer%2CEmbedPlayerNative%2CEmbedPlayerNativeComponent%2CEmbedTypes%2CKBaseButton%2CKBaseComponent%2CKBasePlugin%2CKBaseSmartContainer%2CKCuePoints%2CKDPMapping%2CKEntryLoader%2CKWidgetSupport%2CKalturaIframePlayerSetup%2CMediaElement%2CMediaPlayer%2CMediaPlayers%2CMediaSource%2CPlayerElement%2CPlayerElementFlash%2CPlayerElementHTML%2CPluginManager%7Cmw.MwEmbedSupport.style&pskwidgetpath=..%2Fkwidget-ps%2F&skin=no-theme&version=20260419T085420Z&*&protocol=https&wid=_1681692689 KB478 KB (69%)✓3rd
https://cdnapisec.kaltura.com/html5/html5lib/v2.86/load.php?debug=false&lang=en&modules=Hlsjs%2CPolyfill_Set%2CacCheck%2CacPreview%2Cbase64_decode%2Cbase64_encode%2Cclass%2CcontrolBarContainer%2CcurrentTimeLabel%2CdurationLabel%2CfullScreenBtn%2Cid3Tag%2CkAnalony%2Ckdark%2CkeyboardShortcuts%2CkgitGuard%2ClargePlayBtn%2CliveStream%2CmatchMedia%2CmorePlugins%2CnativeBridge%2CplayPauseBtn%2Cpolyfill_Array_filter%2CqualitySettings%2CreportError%2Cscreenfull%2Cscrubber%2CsideBarContainer%2CsourceSelector%2Ctheme%2CtopBarContainer%2CunMuteOverlayButton%2Cutf8_encode%2CvolumeControl%7Cjquery.client%2Ccolor%2Ccookie%2Cdebouncedresize%2ChoverIntent%2CmessageBox%2CmwEmbedUtil%2CmwExtension%2CnaturalSize%7Cjquery.ui.core%2Cmouse%2Cposition%2Cslider%2Ctooltip%2CtouchPunch%2Cwidget%7Cmediawiki.Uri%2CUtilitiesTime%2CUtilitiesUrl%2Cclient%2CjqueryMsg%2Ckmenu%2Clanguage%2Cutil%7Cmediawiki.util.tmpl%7Cmw.EmbedPlayer%2CEmbedPlayerImageOverlay%2CEmbedPlayerKplayer%2CEmbedPlayerNative%2CEmbedPlayerNativeComponent%2CEmbedTypes%2CKBaseButton%2CKBaseComponent%2CKBasePlugin%2CKBaseSmartContainer%2CKCuePoints%2CKDPMapping%2CKEntryLoader%2CKWidgetSupport%2CKalturaIframePlayerSetup%2CMediaElement%2CMediaPlayer%2CMediaPlayers%2CMediaSource%2CPlayerElement%2CPlayerElementFlash%2CPlayerElementHTML%2CPluginManager%7Cmw.MwEmbedSupport.style&pskwidgetpath=..%2Fkwidget-ps%2F&skin=no-theme&version=20260421T130225Z&*&protocol=https&wid=_16816920 KB478 KB (69%)✓3rd
https://cdnapisec.kaltura.com/html5/html5lib/v2.86/load.php?debug=false&lang=en&modules=Hlsjs%2CPolyfill_Set%2CacCheck%2CacPreview%2Cbase64_decode%2Cbase64_encode%2Cclass%2CcontrolBarContainer%2CcurrentTimeLabel%2CdurationLabel%2CfullScreenBtn%2Cid3Tag%2CkAnalony%2Ckdark%2CkeyboardShortcuts%2CkgitGuard%2ClargePlayBtn%2CliveStream%2CmatchMedia%2CmorePlugins%2CnativeBridge%2CplayPauseBtn%2Cpolyfill_Array_filter%2CqualitySettings%2CreportError%2Cscreenfull%2Cscrubber%2CsideBarContainer%2CsourceSelector%2Ctheme%2CtopBarContainer%2CunMuteOverlayButton%2Cutf8_encode%2CvolumeControl%7Cjquery.client%2Ccolor%2Ccookie%2Cdebouncedresize%2ChoverIntent%2CmessageBox%2CmwEmbedUtil%2CmwExtension%2CnaturalSize%7Cjquery.ui.core%2Cmouse%2Cposition%2Cslider%2Ctooltip%2CtouchPunch%2Cwidget%7Cmediawiki.Uri%2CUtilitiesTime%2CUtilitiesUrl%2Cclient%2CjqueryMsg%2Ckmenu%2Clanguage%2Cutil%7Cmediawiki.util.tmpl%7Cmw.EmbedPlayer%2CEmbedPlayerImageOverlay%2CEmbedPlayerKplayer%2CEmbedPlayerNative%2CEmbedPlayerNativeComponent%2CEmbedTypes%2CKBaseButton%2CKBaseComponent%2CKBasePlugin%2CKBaseSmartContainer%2CKCuePoints%2CKDPMapping%2CKEntryLoader%2CKWidgetSupport%2CKalturaIframePlayerSetup%2CMediaElement%2CMediaPlayer%2CMediaPlayers%2CMediaSource%2CPlayerElement%2CPlayerElementFlash%2CPlayerElementHTML%2CPluginManager%7Cmw.MwEmbedSupport.style&pskwidgetpath=..%2Fkwidget-ps%2F&skin=no-theme&version=20260421T130225Z&*&protocol=https&wid=_16816920 KB478 KB (69%)✓3rd
https://cdnapisec.kaltura.com/html5/html5lib/v2.86/load.php?debug=false&lang=en&modules=Hlsjs%2CPolyfill_Set%2CacCheck%2CacPreview%2Cbase64_decode%2Cbase64_encode%2Cclass%2CcontrolBarContainer%2CcurrentTimeLabel%2CdurationLabel%2CfullScreenBtn%2Cid3Tag%2CkAnalony%2Ckdark%2CkeyboardShortcuts%2CkgitGuard%2ClargePlayBtn%2CliveStream%2CmatchMedia%2CmorePlugins%2CnativeBridge%2CplayPauseBtn%2Cpolyfill_Array_filter%2CqualitySettings%2CreportError%2Cscreenfull%2Cscrubber%2CsideBarContainer%2CsourceSelector%2Ctheme%2CtopBarContainer%2CunMuteOverlayButton%2Cutf8_encode%2CvolumeControl%7Cjquery.client%2Ccolor%2Ccookie%2Cdebouncedresize%2ChoverIntent%2CmessageBox%2CmwEmbedUtil%2CmwExtension%2CnaturalSize%7Cjquery.ui.core%2Cmouse%2Cposition%2Cslider%2Ctooltip%2CtouchPunch%2Cwidget%7Cmediawiki.Uri%2CUtilitiesTime%2CUtilitiesUrl%2Cclient%2CjqueryMsg%2Ckmenu%2Clanguage%2Cutil%7Cmediawiki.util.tmpl%7Cmw.EmbedPlayer%2CEmbedPlayerImageOverlay%2CEmbedPlayerKplayer%2CEmbedPlayerNative%2CEmbedPlayerNativeComponent%2CEmbedTypes%2CKBaseButton%2CKBaseComponent%2CKBasePlugin%2CKBaseSmartContainer%2CKCuePoints%2CKDPMapping%2CKEntryLoader%2CKWidgetSupport%2CKalturaIframePlayerSetup%2CMediaElement%2CMediaPlayer%2CMediaPlayers%2CMediaSource%2CPlayerElement%2CPlayerElementFlash%2CPlayerElementHTML%2CPluginManager%7Cmw.MwEmbedSupport.style&pskwidgetpath=..%2Fkwidget-ps%2F&skin=no-theme&version=20260421T130225Z&*&protocol=https&wid=_1681692689 KB478 KB (69%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-092EL089CH&cx=c&gtm=4e64h1169 KB77 KB (45%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5P4V6Z172 KB75 KB (44%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202408.1.0/otBannerSdk.js110 KB58 KB (53%)✓3rd
https://www.oreilly.com/KxXuCyduA3/oq/qtiMwY_O/uXrEVzLwhDD0Nr/aE0gZA/Cxp/8IWwsPSEB181 KB39 KB (22%)✓3rd
https://www.oreilly.com/KxXuCyduA3/oq/qtiMwY_O/X0rEVzzE/MmwmZA/FCQ/hVwwjR1EPAg?v=a813589d-8d12-d213-fdfe-fb6116870214153 KB32 KB (21%)✓3rd
https://cdn.oreillystatic.com/ajax/libs/jquery/3.3.1/jquery.min.js30 KB22 KB (75%)✓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
118 resources · 5.1 MB · 2.2 MB savings available
FIX
118 resources · 5.1 MB · 2.2 MB savings available
Warning::
Page weight 4.1 MB over 1MB target
Got: 5.1 MB Expected: ≤ 1 MB
Info::
~2.2 MB of savings available
Warning::
117 third-party resources (100% of weight)
Info::
4 resources over 200KB
118 resources · 5.1 MiB · 117 third-party 4.1 MiB over 1MB target
JavaScript 48% · 2.5 MiB
Image 44% · 2.3 MiB
Font 3% · 169.6 KiB
Other 3% · 157.1 KiB
Document 1% · 42.7 KiB
CSS 1% · 35.6 KiB
Media 0% · 2.2 KiB

~2.2 MiB of savings available

Remove unused JavaScript: 2.2 MiB
C
Image Optimization
Action
54 images, 0 KB saveable
REVIEW
54 images, 0 KB saveable
Warning::
https://cdn.oreillystatic.com/oreilly/logos/logo_a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.oreillystatic.com/oreilly/images/logo_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.oreillystatic.com/oreilly/logos/logo_t... 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/logos/logo_b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.oreillystatic.com/oreilly/images/logo_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.oreillystatic.com/oreilly/images/logo_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.oreillystatic.com/oreilly/images/logo_... 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/googl... 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.
Warning::
https://cdn.oreillystatic.com/oreilly/images/amazo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
54 images 2.1 MB
0 oversized -0 KB
49 legacy format
12 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

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

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

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
7 fonts (170 KB)
PASS
7 fonts (170 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

170 KB total

Render-blocking

0

of 7

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
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gilroy-bold.woff2 woff2 swap
Size 22 KB
Load time 26 ms
Start 799 ms
Risk FOUT — text flashes from fallback to web font
GuardianTextSans-Medium... woff2 swap
Size 36 KB
Load time 16 ms
Start 799 ms
Risk FOUT — text flashes from fallback to web font
GuardianTextSans-Regula... woff2 swap
Size 36 KB
Load time 27 ms
Start 800 ms
Risk FOUT — text flashes from fallback to web font
gilroy-light.woff2 woff2 swap
Size 20 KB
Load time 12 ms
Start 885 ms
Risk FOUT — text flashes from fallback to web font
gilroy-semibold.woff2 woff2 swap
Size 21 KB
Load time 13 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
gilroy-regular.woff2 woff2 swap
Size 21 KB
Load time 17 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
icomoon.woff woff swap
Size 14 KB
Load time 5 ms
Start 2.0 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)

Fixing the unchecked items could save ~4 KB and ~8 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
118 requests over 3853ms
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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 2673ms · 1337KB · €29/mo
cdnapisec.kaltura.com
Other
Costly
Execution 824ms
Transfer 0 KB
Unused 69%
Monthly Cost €9/mo
Unattributable
Other
Costly
Execution 446ms
Transfer 0 KB
Monthly Cost €5/mo
www.oreilly.com
Other
Costly
Execution 409ms
Transfer 42 KB
Monthly Cost €4/mo
cdnapisec.kaltura.com
Other
Costly
Execution 263ms
Transfer 689 KB
Unused 69%
Monthly Cost €3/mo
www.oreilly.com
Other
Costly
Execution 239ms
Transfer 153 KB
Unused 21%
Monthly Cost €3/mo
www.oreilly.com
Other
Costly
Execution 229ms
Transfer 1 KB
Unused 22%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 122ms
Transfer 172 KB
Unused 44%
Monthly Cost €1/mo
OneTrust
Consent
Essential
Execution 80ms
Transfer 110 KB
Unused 53%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 60ms
Transfer 169 KB
Unused 45%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • cdnapisec.kaltura.com adds 824ms and costs ~€9/month
  • Unattributable adds 446ms and costs ~€5/month
  • www.oreilly.com adds 409ms and costs ~€4/month
  • cdnapisec.kaltura.com adds 263ms and costs ~€3/month
  • www.oreilly.com adds 239ms and costs ~€3/month
  • www.oreilly.com adds 229ms and costs ~€2/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

cdnapisec.kaltura.com takes 824ms 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

69% of cdnapisec.kaltura.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

Unattributable takes 446ms 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 409ms 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

cdnapisec.kaltura.com takes 263ms 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

69% of cdnapisec.kaltura.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.oreilly.com takes 239ms 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 229ms 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

53% 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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