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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
40
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.
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.

2.38 s

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

7.45 s

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

3.51 s

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

0.004

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

4.96 s

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

17.04 s

Page Load Progression

583 ms
1.2 s
1.8 s
2.3 s
2.9 s
3.5 s
4.1 s
4.7 s
Checks
17
8 PASS 2 REVIEW 5 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 154 requests
FIX
2.2 MB transferred, 154 requests
Info::
Page weighs 5.5 MB (2.2 MB transferred)
Warning::
JavaScript is 820 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 820 KB
Info::
Fonts are 301 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 301 KB
Warning::
154 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.46 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
154 requests
0.46 g CO2 per page load
Images 904.4 KiB 40%
JavaScript 819.7 KiB 36%
Fonts 301.2 KiB 13%
HTML 109.7 KiB 5%
Other 85.9 KiB 4%
CSS 31.3 KiB 1%
Other 1.9 KiB 0%
Other 1.1 KiB 0%
Other 450 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

Why this matters

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

Source: web.dev

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 (2.2 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
16183ms total JS execution
FIX
16183ms total JS execution
Warning::
https://www.kobo.com/_next/static/chunks/90018-479...: 12721ms CPU time
Warning::
https://www.kobo.com/: 1901ms CPU time
Warning::
Unattributable: 743ms CPU time
Info::
https://www.kobo.com/_next/static/chunks/87c73c54-...: 225ms CPU time
Info::
https://www.kobo.com/_next/static/chunks/72330-71c...: 154ms CPU time
Warning::
Third-party scripts: 16183ms (100% of total)

Main Thread Breakdown

Script Evaluation 75% Other 9% Style & Layout 6% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
https://www.kobo.com/_next/static/chunks/90018-47990356ea45b8c5.js12721ms11549ms13ms3rd
https://www.kobo.com/1901ms55ms78ms3rd
Unattributable743ms55ms0ms3rd
https://www.kobo.com/_next/static/chunks/87c73c54-09e1ba5c70e60a51.js225ms109ms17ms3rd
https://www.kobo.com/_next/static/chunks/72330-71c1325b9b4a6acd.js154ms62ms11ms3rd
https://www.kobo.com/_next/static/chunks/app/%5Bcountry%5D/%5Blanguage%5D/(layout-with-simplified-header-default-footer)/layout-b2f7f78ee56fdf6e.js139ms136ms2ms3rd
https://www.kobo.com/_next/static/chunks/app/%5Bcountry%5D/%5Blanguage%5D/(layout-with-default-header-footer)/layout-01d9ac341846e1d3.js112ms105ms7ms3rd
https://www.kobo.com/_next/static/chunks/24383-47d801ef93a7c045.js101ms96ms5ms3rd
https://www.kobo.com/_next/static/chunks/app/error-65be25b54ac3caaa.js86ms85ms1ms3rd
D
Page Weight Inventory
Action
154 resources · 2.2 MB · 129 KB savings available
FIX
154 resources · 2.2 MB · 129 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~129 KB of savings available
Warning::
153 third-party resources (100% of weight)
154 resources · 2.2 MiB · 153 third-party 1.2 MiB over 1MB target
Image 40% · 905.4 KiB
JavaScript 36% · 819.7 KiB
Font 13% · 301.2 KiB
Document 5% · 109.7 KiB
Other 4% · 88.3 KiB
CSS 1% · 31.3 KiB

~128.7 KiB of savings available

Remove unused JavaScript: 128.7 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
29 images, 0 KB saveable
REVIEW
29 images, 0 KB saveable
Warning::
https://www.kobo.com/assets/device-images/kobo-sag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.builder.io/api/v1/image/assets%2F7835b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.kobo.com/assets/device-images/kobo-lib... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.kobo.com/assets/device-images/kobo-cla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.kobo.com/assets/device-images/kobo-eli... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.kobo.com/assets/device-images/kobo-cla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.kobo.com/assets/cross-platform-hero-ba... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
29 images 904 KB
0 oversized -0 KB
18 legacy format
7 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

B
JS Bundles
71 scripts, 129 KB unused
REVIEW
71 scripts, 129 KB unused
Warning::
https://www.kobo.com/_next/static/chunks/77997-911...: 59 KB unused (95%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.kobo.com/_next/static/chunks/10188-43d...: 49 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.kobo.com/_next/static/chunks/49808-a86...: 21 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 129 KB
129 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.kobo.com/_next/static/chunks/77997-911375830be96206.js62 KB59 KB (95%)✓3rd
https://www.kobo.com/_next/static/chunks/10188-43d379f98b1d35e5.js65 KB49 KB (75%)✓3rd
https://www.kobo.com/_next/static/chunks/49808-a865af94bb920e07.js31 KB21 KB (68%)✓3rd
https://www.kobo.com/_next/static/chunks/3e61fc0b-8c1118562bee8296.js26 KB—✓3rd
https://www.kobo.com/_next/static/chunks/11317-9b05a0d9c44382d6.js3 KB—✓3rd
https://www.kobo.com/_next/static/chunks/10123-9e05b63657db02ee.js13 KB—✓3rd
https://www.kobo.com/_next/static/chunks/72330-71c1325b9b4a6acd.js49 KB—✓3rd
https://www.kobo.com/_next/static/chunks/75559-cf3a84c4b5a80a46.js5 KB—✓3rd
https://www.kobo.com/_next/static/chunks/37273-b96062cd69ac2145.js9 KB—✓3rd
https://www.kobo.com/_next/static/chunks/app/error-65be25b54ac3caaa.js4 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

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
11 fonts (301 KB)
PASS
11 fonts (301 KB)
Info::
11 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

11

301 KB total

Render-blocking

0

of 11

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 5.0 s 6.0 s 7.0 s FCP 2.4 s LCP 7.5 shttps://www.kobo.com/_next/static/media/05377cc8900f4a46-s.p.woff205377cc8900f4a46-s.p.woff2 https://www.kobo.com/_next/static/media/05377cc8900f4a46-s.p.woff2 — 25.1 KiB — 63 ms — font-display: swaphttps://www.kobo.com/_next/static/media/0ce79e609a8929ba-s.p.woff20ce79e609a8929ba-s.p.woff2 https://www.kobo.com/_next/static/media/0ce79e609a8929ba-s.p.woff2 — 28.6 KiB — 70 ms — font-display: swaphttps://www.kobo.com/_next/static/media/1abb786405b2c51a-s.p.woff21abb786405b2c51a-s.p.woff2 https://www.kobo.com/_next/static/media/1abb786405b2c51a-s.p.woff2 — 28.3 KiB — 56 ms — font-display: swaphttps://www.kobo.com/_next/static/media/2e83e4312f6f7ee6-s.p.woff22e83e4312f6f7ee6-s.p.woff2 https://www.kobo.com/_next/static/media/2e83e4312f6f7ee6-s.p.woff2 — 31.8 KiB — 74 ms — font-display: swaphttps://www.kobo.com/_next/static/media/3977b8de08118f66-s.p.woff23977b8de08118f66-s.p.woff2 https://www.kobo.com/_next/static/media/3977b8de08118f66-s.p.woff2 — 28.9 KiB — 63 ms — font-display: swaphttps://www.kobo.com/_next/static/media/3e12fd1a8c8d945b-s.p.woff23e12fd1a8c8d945b-s.p.woff2 https://www.kobo.com/_next/static/media/3e12fd1a8c8d945b-s.p.woff2 — 27.5 KiB — 41 ms — font-display: swaphttps://www.kobo.com/_next/static/media/63be64a7eb12880a-s.p.woff263be64a7eb12880a-s.p.woff2 https://www.kobo.com/_next/static/media/63be64a7eb12880a-s.p.woff2 — 33.0 KiB — 65 ms — font-display: swaphttps://www.kobo.com/_next/static/media/f0214d36897aa883-s.p.woff2f0214d36897aa883-s.p.woff2 https://www.kobo.com/_next/static/media/f0214d36897aa883-s.p.woff2 — 25.9 KiB — 77 ms — font-display: swaphttps://www.kobo.com/_next/static/media/kobo-icon.46e2a41d.ttfkobo-icon.46e2a41d.ttf https://www.kobo.com/_next/static/media/kobo-icon.46e2a41d.ttf — 21.0 KiB — 66 ms — font-display: swaphttps://www.kobo.com/_next/static/media/RakutenSans_UI_W_SBd.f0214d36.woff2RakutenSans_UI_W_SBd.f0... https://www.kobo.com/_next/static/media/RakutenSans_UI_W_SBd.f0214d36.woff2 — 25.9 KiB — 56 ms — font-display: swaphttps://www.kobo.com/_next/static/media/RakutenSans_UI_W_Rg.05377cc8.woff2RakutenSans_UI_W_Rg.053... https://www.kobo.com/_next/static/media/RakutenSans_UI_W_Rg.05377cc8.woff2 — 25.2 KiB — 64 ms — font-display: swap
05377cc8900f4a46-s.p.woff2 woff2 swap
Size 25 KB
Load time 63 ms
Start 727 ms
Risk FOUT — text flashes from fallback to web font
0ce79e609a8929ba-s.p.woff2 woff2 swap
Size 29 KB
Load time 70 ms
Start 728 ms
Risk FOUT — text flashes from fallback to web font
1abb786405b2c51a-s.p.woff2 woff2 swap
Size 28 KB
Load time 56 ms
Start 729 ms
Risk FOUT — text flashes from fallback to web font
2e83e4312f6f7ee6-s.p.woff2 woff2 swap
Size 32 KB
Load time 74 ms
Start 729 ms
Risk FOUT — text flashes from fallback to web font
3977b8de08118f66-s.p.woff2 woff2 swap
Size 29 KB
Load time 63 ms
Start 729 ms
Risk FOUT — text flashes from fallback to web font
3e12fd1a8c8d945b-s.p.woff2 woff2 swap
Size 28 KB
Load time 41 ms
Start 730 ms
Risk FOUT — text flashes from fallback to web font
63be64a7eb12880a-s.p.woff2 woff2 swap
Size 33 KB
Load time 65 ms
Start 730 ms
Risk FOUT — text flashes from fallback to web font
f0214d36897aa883-s.p.woff2 woff2 swap
Size 26 KB
Load time 77 ms
Start 730 ms
Risk FOUT — text flashes from fallback to web font
kobo-icon.46e2a41d.ttf ttf swap
Size 21 KB
Load time 66 ms
Start 908 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
RakutenSans_UI_W_SBd.f0... woff2 swap
Size 26 KB
Load time 56 ms
Start 908 ms
Risk FOUT — text flashes from fallback to web font
RakutenSans_UI_W_Rg.053... woff2 swap
Size 25 KB
Load time 64 ms
Start 908 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)

Fixing the unchecked items could save ~6 KB and ~12 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+
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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
154 requests over 5173ms
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 2.4 s LCP 7.5 shttps://kobo.com// https://kobo.com/ — 302 — 93 B — 62 ms — h2https://www.kobo.com/www.kobo.com/ https://www.kobo.com/ — 200 — 109.7 KiB — 976 ms — h2https://www.kobo.com/_next/static/media/05377cc8900f4a46-s.p.woff2www.kobo.com/_next/static/media/053... https://www.kobo.com/_next/static/media/05377cc8900f4a46-s.p.woff2 — 200 — 25.1 KiB — 63 ms — h2https://www.kobo.com/_next/static/media/0ce79e609a8929ba-s.p.woff2www.kobo.com/_next/static/media/0ce... https://www.kobo.com/_next/static/media/0ce79e609a8929ba-s.p.woff2 — 200 — 28.6 KiB — 70 ms — h2https://www.kobo.com/_next/static/media/1abb786405b2c51a-s.p.woff2www.kobo.com/_next/static/media/1ab... https://www.kobo.com/_next/static/media/1abb786405b2c51a-s.p.woff2 — 200 — 28.3 KiB — 56 ms — h2https://www.kobo.com/_next/static/media/2e83e4312f6f7ee6-s.p.woff2www.kobo.com/_next/static/media/2e8... https://www.kobo.com/_next/static/media/2e83e4312f6f7ee6-s.p.woff2 — 200 — 31.8 KiB — 74 ms — h2https://www.kobo.com/_next/static/media/3977b8de08118f66-s.p.woff2www.kobo.com/_next/static/media/397... https://www.kobo.com/_next/static/media/3977b8de08118f66-s.p.woff2 — 200 — 28.9 KiB — 63 ms — h2https://www.kobo.com/_next/static/media/3e12fd1a8c8d945b-s.p.woff2www.kobo.com/_next/static/media/3e1... https://www.kobo.com/_next/static/media/3e12fd1a8c8d945b-s.p.woff2 — 200 — 27.5 KiB — 41 ms — h2https://www.kobo.com/_next/static/media/63be64a7eb12880a-s.p.woff2www.kobo.com/_next/static/media/63b... https://www.kobo.com/_next/static/media/63be64a7eb12880a-s.p.woff2 — 200 — 33.0 KiB — 65 ms — h2https://www.kobo.com/_next/static/media/f0214d36897aa883-s.p.woff2www.kobo.com/_next/static/media/f02... https://www.kobo.com/_next/static/media/f0214d36897aa883-s.p.woff2 — 200 — 25.9 KiB — 77 ms — h2https://www.kobo.com/_next/static/css/715be398208dca58.csswww.kobo.com/_next/static/css/715be... https://www.kobo.com/_next/static/css/715be398208dca58.css — 200 — 2.7 KiB — 74 ms — h2https://www.kobo.com/_next/static/css/617148611e95c731.csswww.kobo.com/_next/static/css/61714... https://www.kobo.com/_next/static/css/617148611e95c731.css — 200 — 17.3 KiB — 43 ms — h2https://www.kobo.com/_next/static/css/0d2474af8fec3157.csswww.kobo.com/_next/static/css/0d247... https://www.kobo.com/_next/static/css/0d2474af8fec3157.css — 200 — 11.3 KiB — 43 ms — h2https://www.kobo.com/assets/cross-platform-hero-banner.pngwww.kobo.com/assets/cross-platform-... https://www.kobo.com/assets/cross-platform-hero-banner.png — 200 — 160.7 KiB — 214 ms — h2https://www.kobo.com/assets/device-images/kobo-libra-colour.webpwww.kobo.com/assets/device-images/k... https://www.kobo.com/assets/device-images/kobo-libra-colour.webp — 200 — 11.9 KiB — 156 ms — h2https://www.kobo.com/assets/device-images/kobo-clara-colour.webpwww.kobo.com/assets/device-images/k... https://www.kobo.com/assets/device-images/kobo-clara-colour.webp — 200 — 114.8 KiB — 192 ms — h2https://www.kobo.com/assets/device-images/kobo-clara-bw.webpwww.kobo.com/assets/device-images/k... https://www.kobo.com/assets/device-images/kobo-clara-bw.webp — 200 — 21.3 KiB — 467 ms — h2https://www.kobo.com/assets/device-images/kobo-sage.webpwww.kobo.com/assets/device-images/k... https://www.kobo.com/assets/device-images/kobo-sage.webp — 200 — 12.3 KiB — 173 ms — h2https://www.kobo.com/assets/device-images/kobo-elipsa-2e.webpwww.kobo.com/assets/device-images/k... https://www.kobo.com/assets/device-images/kobo-elipsa-2e.webp — 200 — 15.3 KiB — 153 ms — h2https://cdn.builder.io/api/v1/image/assets%2F7835b45c92b04a26beedd3c1851c74a5%2Fb66401b78d224f8f81ebd89128e60e00?format=webpcdn.builder.io/api/v1/image/assets%... https://cdn.builder.io/api/v1/image/assets%2F7835b45c92b04a26beedd3c1851c74a5%2Fb66401b78d224f8f81ebd89128e60e00?format=webp — 200 — 160.8 KiB — 47 ms — h2https://cdn.kobo.com/book-images/e9789b8c-7c73-4025-8fdb-379b6b57c02a/200/300/90/false/una-nina-buena.webpcdn.kobo.com/book-images/e9789b8c-7... https://cdn.kobo.com/book-images/e9789b8c-7c73-4025-8fdb-379b6b57c02a/200/300/90/false/una-nina-buena.webp — 200 — 16.6 KiB — 97 ms — h2https://cdn.kobo.com/book-images/558994bd-4c4c-4e32-b132-64e09e7f6a0a/200/300/90/false/mentira-4.webpcdn.kobo.com/book-images/558994bd-4... https://cdn.kobo.com/book-images/558994bd-4c4c-4e32-b132-64e09e7f6a0a/200/300/90/false/mentira-4.webp — 200 — 13.1 KiB — 90 ms — h2https://cdn.kobo.com/book-images/d1ff55f3-2fd2-47d4-ba00-c5c6e90a2b4c/200/300/90/false/maite-2.webpcdn.kobo.com/book-images/d1ff55f3-2... https://cdn.kobo.com/book-images/d1ff55f3-2fd2-47d4-ba00-c5c6e90a2b4c/200/300/90/false/maite-2.webp — 200 — 10.1 KiB — 97 ms — h2https://cdn.kobo.com/book-images/b486fd0b-d90d-460d-85f4-c7ac277b44c6/200/300/90/false/querida-debbie-2.webpcdn.kobo.com/book-images/b486fd0b-d... 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407 ms — h2https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListGroup=Home.Spotlight.1www.kobo.com/api/kobo-ui/storeapi/v... https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListGroup=Home.Spotlight.1 — 200 — 4.2 KiB — 352 ms — h2https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListId=8ccd7940-958a-4e9b-af87-2e90d582bfcc&pageSize=14&sortList=falsewww.kobo.com/api/kobo-ui/storeapi/v... https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListId=8ccd7940-958a-4e9b-af87-2e90d582bfcc&pageSize=14&sortList=false — 200 — 6.4 KiB — 368 ms — h2https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListId=0c4dcef2-a1fc-c878-4717-08dda9b3198c&pageSize=14&sortList=falsewww.kobo.com/api/kobo-ui/storeapi/v... 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340 ms — h2https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListGroup=Home.Spotlight.2www.kobo.com/api/kobo-ui/storeapi/v... https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListGroup=Home.Spotlight.2 — 200 — 4.6 KiB — 350 ms — h2https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListId=717382cb-24fc-cead-9a21-08d48e1ff90d&pageSize=14&sortList=falsewww.kobo.com/api/kobo-ui/storeapi/v... https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListId=717382cb-24fc-cead-9a21-08d48e1ff90d&pageSize=14&sortList=false — 200 — 6.3 KiB — 335 ms — h2https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListId=eed77ab1-a173-407c-aa93-a0b6c25586e9&pageSize=14&sortList=falsewww.kobo.com/api/kobo-ui/storeapi/v... https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListId=eed77ab1-a173-407c-aa93-a0b6c25586e9&pageSize=14&sortList=false — 200 — 6.1 KiB — 343 ms — h2https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListId=be8802f5-eae2-cf95-fd07-08dce9e685aa&pageSize=14&sortList=falsewww.kobo.com/api/kobo-ui/storeapi/v... https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListId=be8802f5-eae2-cf95-fd07-08dce9e685aa&pageSize=14&sortList=false — 200 — 6.6 KiB — 271 ms — h2https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListGroup=Home.Spotlight.3www.kobo.com/api/kobo-ui/storeapi/v... https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListGroup=Home.Spotlight.3 — 200 — 4.8 KiB — 213 ms — h2https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListId=90cccba3-9ac1-4a1b-b934-d851d2ae2032&pageSize=14&sortList=falsewww.kobo.com/api/kobo-ui/storeapi/v... https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListId=90cccba3-9ac1-4a1b-b934-d851d2ae2032&pageSize=14&sortList=false — 200 — 7.1 KiB — 211 ms — h2https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListId=4aab718e-fae8-c74c-8a26-08dd81b095d0&pageSize=14&sortList=falsewww.kobo.com/api/kobo-ui/storeapi/v... https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListId=4aab718e-fae8-c74c-8a26-08dd81b095d0&pageSize=14&sortList=false — 200 — 377 B — 330 ms — h2https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListId=8ac91b75-bc8c-c3ae-6baa-08dc847f9b5c&pageSize=14&sortList=falsewww.kobo.com/api/kobo-ui/storeapi/v... https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListId=8ac91b75-bc8c-c3ae-6baa-08dc847f9b5c&pageSize=14&sortList=false — 200 — 6.8 KiB — 174 ms — h2https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListId=4d7b1ffd-fb46-c9bc-1541-08d7afb311d1&pageSize=14&sortList=falsewww.kobo.com/api/kobo-ui/storeapi/v... https://www.kobo.com/api/kobo-ui/storeapi/v2/products/list/featured?country=es&language=es&featuredListId=4d7b1ffd-fb46-c9bc-1541-08d7afb311d1&pageSize=14&sortList=false — 200 — 6.2 KiB — 349 ms — h2https://www.kobo.com/_next/static/chunks/50927.c68c732584d94b30.jswww.kobo.com/_next/static/chunks/50... https://www.kobo.com/_next/static/chunks/50927.c68c732584d94b30.js — 200 — 1018 B — 45 ms — h2https://www.kobo.com/_next/static/chunks/71749.ef072d46ecd673e6.jswww.kobo.com/_next/static/chunks/71... https://www.kobo.com/_next/static/chunks/71749.ef072d46ecd673e6.js — 200 — 1.1 KiB — 36 ms — h2https://www.kobo.com/assets/favicon.icowww.kobo.com/assets/favicon.ico https://www.kobo.com/assets/favicon.ico — 200 — 1.0 KiB — 143 ms — h2https://app.launchdarkly.com/sdk/goals/681e24825c237b0fa36570a6app.launchdarkly.com/sdk/goals/681e... https://app.launchdarkly.com/sdk/goals/681e24825c237b0fa36570a6 — 200 — 0 B — 52 ms — h2https://app.launchdarkly.com/sdk/goals/681e24825c237b0fa36570a6app.launchdarkly.com/sdk/goals/681e... https://app.launchdarkly.com/sdk/goals/681e24825c237b0fa36570a6 — 200 — 235 B — 3 ms — h2https://www.kobo.com/api/kobo-ui/purchasing/shoppingcart/v1/web/countwww.kobo.com/api/kobo-ui/purchasing... https://www.kobo.com/api/kobo-ui/purchasing/shoppingcart/v1/web/count — 200 — 107 B — 158 ms — h2https://www.kobo.com/api/kobo-ui/store/api/v1/HeaderLinkGroup/Get?country=es&language=eswww.kobo.com/api/kobo-ui/store/api/... https://www.kobo.com/api/kobo-ui/store/api/v1/HeaderLinkGroup/Get?country=es&language=es — 200 — 1.1 KiB — 153 ms — h2https://events.launchdarkly.com/events/diagnostic/681e24825c237b0fa36570a6events.launchdarkly.com/events/diag... https://events.launchdarkly.com/events/diagnostic/681e24825c237b0fa36570a6 — 204 — 0 B — 335 ms — h2https://app.launchdarkly.com/sdk/evalx/681e24825c237b0fa36570a6/contexts/eyJraW5kIjoibXVsdGkiLCJzZXNzaW9uSWQiOnsic3RvcmVGcm9udENvdW50cnkiOiJlcyIsInN0b3JlRnJvbnRMYW5ndWFnZSI6ImVzIiwia2V5IjoiNDQ0MTQ3N2UtMjEyNi00MmUyLWE4NjctNDA1ZGJmMzk4MGMyIiwiZG9RdWVyeUtvYm9QbHVzRmlsdGVyIjpmYWxzZSwicGxhdGZvcm1JZCI6IjAwMDAwMDAwLTAwMDAtMDAwMC0wMDAwLWZmZmZmZmZmMDAwMCJ9fQapp.launchdarkly.com/sdk/evalx/681e... https://app.launchdarkly.com/sdk/evalx/681e24825c237b0fa36570a6/contexts/eyJraW5kIjoibXVsdGkiLCJzZXNzaW9uSWQiOnsic3RvcmVGcm9udENvdW50cnkiOiJlcyIsInN0b3JlRnJvbnRMYW5ndWFnZSI6ImVzIiwia2V5IjoiNDQ0MTQ3N2UtMjEyNi00MmUyLWE4NjctNDA1ZGJmMzk4MGMyIiwiZG9RdWVyeUtvYm9QbHVzRmlsdGVyIjpmYWxzZSwicGxhdGZvcm1JZCI6IjAwMDAwMDAwLTAwMDAtMDAwMC0wMDAwLWZmZmZmZmZmMDAwMCJ9fQ — 200 — 0 B — 2 ms — h2https://app.launchdarkly.com/sdk/evalx/681e24825c237b0fa36570a6/contexts/eyJraW5kIjoibXVsdGkiLCJzZXNzaW9uSWQiOnsic3RvcmVGcm9udENvdW50cnkiOiJlcyIsInN0b3JlRnJvbnRMYW5ndWFnZSI6ImVzIiwia2V5IjoiNDQ0MTQ3N2UtMjEyNi00MmUyLWE4NjctNDA1ZGJmMzk4MGMyIiwiZG9RdWVyeUtvYm9QbHVzRmlsdGVyIjpmYWxzZSwicGxhdGZvcm1JZCI6IjAwMDAwMDAwLTAwMDAtMDAwMC0wMDAwLWZmZmZmZmZmMDAwMCJ9fQapp.launchdarkly.com/sdk/evalx/681e... https://app.launchdarkly.com/sdk/evalx/681e24825c237b0fa36570a6/contexts/eyJraW5kIjoibXVsdGkiLCJzZXNzaW9uSWQiOnsic3RvcmVGcm9udENvdW50cnkiOiJlcyIsInN0b3JlRnJvbnRMYW5ndWFnZSI6ImVzIiwia2V5IjoiNDQ0MTQ3N2UtMjEyNi00MmUyLWE4NjctNDA1ZGJmMzk4MGMyIiwiZG9RdWVyeUtvYm9QbHVzRmlsdGVyIjpmYWxzZSwicGxhdGZvcm1JZCI6IjAwMDAwMDAwLTAwMDAtMDAwMC0wMDAwLWZmZmZmZmZmMDAwMCJ9fQ — 200 — 985 B — 13 ms — h2https://browser-intake-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubd23444f8be96a4f5dff06375680c32d5&dd-evp-origin-version=6.32.0&dd-evp-origin=browser&dd-request-id=59532801-288e-4d8a-a9cf-d061b946eace&batch_time=1776811261894&_dd.api=fetchbrowser-intake-datadoghq.com/api/v2... https://browser-intake-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubd23444f8be96a4f5dff06375680c32d5&dd-evp-origin-version=6.32.0&dd-evp-origin=browser&dd-request-id=59532801-288e-4d8a-a9cf-d061b946eace&batch_time=1776811261894&_dd.api=fetch — 202 — 464 B — 497 ms — http/1.1https://browser-intake-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubd23444f8be96a4f5dff06375680c32d5&dd-evp-origin-version=6.32.0&dd-evp-origin=browser&dd-request-id=488eeb9f-e779-48db-a662-aac32c444f34&batch_time=1776811261897&_dd.api=fetchbrowser-intake-datadoghq.com/api/v2... https://browser-intake-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubd23444f8be96a4f5dff06375680c32d5&dd-evp-origin-version=6.32.0&dd-evp-origin=browser&dd-request-id=488eeb9f-e779-48db-a662-aac32c444f34&batch_time=1776811261897&_dd.api=fetch — 202 — 464 B — 472 ms — http/1.1https://browser-intake-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubd23444f8be96a4f5dff06375680c32d5&dd-evp-origin-version=6.32.0&dd-evp-origin=browser&dd-request-id=3888f163-5dbe-4efd-abdc-68c8bd3a46ef&batch_time=1776811261900&_dd.api=fetchbrowser-intake-datadoghq.com/api/v2... https://browser-intake-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubd23444f8be96a4f5dff06375680c32d5&dd-evp-origin-version=6.32.0&dd-evp-origin=browser&dd-request-id=3888f163-5dbe-4efd-abdc-68c8bd3a46ef&batch_time=1776811261900&_dd.api=fetch — 202 — 464 B — 427 ms — http/1.1https://browser-intake-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubd23444f8be96a4f5dff06375680c32d5&dd-evp-origin-version=6.32.0&dd-evp-origin=browser&dd-request-id=c4feeedf-055d-4831-9891-2b1b914eecc9&batch_time=1776811261902&_dd.api=fetchbrowser-intake-datadoghq.com/api/v2... https://browser-intake-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubd23444f8be96a4f5dff06375680c32d5&dd-evp-origin-version=6.32.0&dd-evp-origin=browser&dd-request-id=c4feeedf-055d-4831-9891-2b1b914eecc9&batch_time=1776811261902&_dd.api=fetch — 202 — 464 B — 423 ms — http/1.1https://browser-intake-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubd23444f8be96a4f5dff06375680c32d5&dd-evp-origin-version=6.32.0&dd-evp-origin=browser&dd-request-id=6a98d222-48f1-4bef-bf1b-bc8040b5ebdd&batch_time=1776811261904&_dd.api=fetchbrowser-intake-datadoghq.com/api/v2... https://browser-intake-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubd23444f8be96a4f5dff06375680c32d5&dd-evp-origin-version=6.32.0&dd-evp-origin=browser&dd-request-id=6a98d222-48f1-4bef-bf1b-bc8040b5ebdd&batch_time=1776811261904&_dd.api=fetch — 202 — 464 B — 465 ms — http/1.1https://events.launchdarkly.com/events/bulk/681e24825c237b0fa36570a6events.launchdarkly.com/events/bulk... https://events.launchdarkly.com/events/bulk/681e24825c237b0fa36570a6 — 204 — 0 B — 254 ms — 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http/1.1https://browser-intake-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubd23444f8be96a4f5dff06375680c32d5&dd-evp-origin-version=6.32.0&dd-evp-origin=browser&dd-request-id=ddac37bc-a48e-477c-b62f-dc60e310fd9a&batch_time=1776811262325&_dd.api=fetchbrowser-intake-datadoghq.com/api/v2... https://browser-intake-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubd23444f8be96a4f5dff06375680c32d5&dd-evp-origin-version=6.32.0&dd-evp-origin=browser&dd-request-id=ddac37bc-a48e-477c-b62f-dc60e310fd9a&batch_time=1776811262325&_dd.api=fetch — 202 — 464 B — 137 ms — http/1.1https://browser-intake-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubd23444f8be96a4f5dff06375680c32d5&dd-evp-origin-version=6.32.0&dd-evp-origin=browser&dd-request-id=f6060677-ab85-45e9-af75-232763888450&batch_time=1776811262370&_dd.api=fetchbrowser-intake-datadoghq.com/api/v2... https://browser-intake-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubd23444f8be96a4f5dff06375680c32d5&dd-evp-origin-version=6.32.0&dd-evp-origin=browser&dd-request-id=f6060677-ab85-45e9-af75-232763888450&batch_time=1776811262370&_dd.api=fetch — 202 — 464 B — 174 ms — http/1.1https://browser-intake-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubd23444f8be96a4f5dff06375680c32d5&dd-evp-origin-version=6.32.0&dd-evp-origin=browser&dd-request-id=e064bf9f-7745-4ae4-9323-5a9624d831ad&batch_time=1776811262372&_dd.api=fetchbrowser-intake-datadoghq.com/api/v2... https://browser-intake-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubd23444f8be96a4f5dff06375680c32d5&dd-evp-origin-version=6.32.0&dd-evp-origin=browser&dd-request-id=e064bf9f-7745-4ae4-9323-5a9624d831ad&batch_time=1776811262372&_dd.api=fetch — 202 — 464 B — 188 ms — http/1.1https://browser-intake-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubd23444f8be96a4f5dff06375680c32d5&dd-evp-origin-version=6.32.0&dd-evp-origin=browser&dd-request-id=9e155661-a409-4330-a0ec-83bcc853ad53&batch_time=1776811262393&_dd.api=fetchbrowser-intake-datadoghq.com/api/v2... https://browser-intake-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubd23444f8be96a4f5dff06375680c32d5&dd-evp-origin-version=6.32.0&dd-evp-origin=browser&dd-request-id=9e155661-a409-4330-a0ec-83bcc853ad53&batch_time=1776811262393&_dd.api=fetch — 202 — 464 B — 136 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 16183ms · 319KB · $215/mo
www.kobo.com
Other
Costly
Execution 12721ms
Transfer 46 KB
Monthly Cost $169/mo
www.kobo.com
Other
Costly
Execution 1901ms
Transfer 110 KB
Monthly Cost $25/mo
Unattributable
Other
Costly
Execution 743ms
Transfer 0 KB
Monthly Cost $10/mo
www.kobo.com
Other
Costly
Execution 225ms
Transfer 53 KB
Monthly Cost $3/mo
www.kobo.com
Other
Optional
Execution 154ms
Transfer 49 KB
Monthly Cost $2/mo
www.kobo.com
Other
Optional
Execution 139ms
Transfer 11 KB
Monthly Cost $2/mo
www.kobo.com
Other
Optional
Execution 112ms
Transfer 29 KB
Monthly Cost $1/mo
www.kobo.com
Other
Optional
Execution 101ms
Transfer 18 KB
Monthly Cost $1/mo
www.kobo.com
Other
Optional
Execution 86ms
Transfer 4 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.kobo.com adds 12721ms and costs ~$169/month
  • www.kobo.com adds 1901ms and costs ~$25/month
  • Unattributable adds 743ms and costs ~$10/month
  • www.kobo.com adds 225ms 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.

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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.kobo.com takes 12721ms 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.kobo.com takes 1901ms 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 743ms 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.kobo.com takes 225ms 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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