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https://knihobot.cz

Performance

· 23 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
6
REVIEW
5
PASS
8
INFO
4

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.
92
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

761 ms

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

1.56 s

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

446 ms

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

0.000

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

1.31 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.

3.07 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
23
8 PASS 5 REVIEW 6 FIX
D
Page Weight Budget
Action
2.4 MB transferred, 161 requests
FIX
2.4 MB transferred, 161 requests
Warning::
Page weighs 8.5 MB (2.4 MB transferred)
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Warning::
161 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.51 g CO2 per page load
2.4 MB / 2.4 MB budget
2.4 MB transferred
161 requests
0.51 g CO2 per page load
JavaScript 1.5 MiB 61%
Images 370.3 KiB 15%
Other 295.1 KiB 12%
Fonts 105.4 KiB 4%
CSS 104.0 KiB 4%
Other 61.6 KiB 2%
HTML 35.4 KiB 1%
Other 6.1 KiB 0%
Other 619 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

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
98% third-party, 0 ms blocking
FIX
98% third-party, 0 ms blocking
Warning::
Third-party code accounts for 98% of page weight (2.4 MiB of 2.4 MiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-party
D
JS Execution Cost
Action
2048ms total JS execution
FIX
2048ms total JS execution
Warning::
https://c77.bookbot.com/_next/static/chunks/framew...: 1148ms CPU time
Warning::
https://knihobot.cz/: 377ms CPU time
Info::
Unattributable: 169ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-TF5...: 102ms CPU time
Info::
https://c77.bookbot.com/_next/static/chunks/5803-4...: 99ms CPU time
Warning::
Third-party scripts: 1501ms (73% of total)

Main Thread Breakdown

Script Evaluation 40% Other 39% Style & Layout 13% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://c77.bookbot.com/_next/static/chunks/framework-c6c82aad00023883.js1148ms499ms3ms3rd
https://knihobot.cz/377ms2ms0ms1st
Unattributable169ms5ms0ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-TF5RV29102ms89ms11ms3rd
https://c77.bookbot.com/_next/static/chunks/5803-44b4c941d125f4db.js99ms43ms2ms3rd
https://c77.bookbot.com/_next/static/chunks/pages/_app-3f66b878bb9e3ed3.js86ms37ms8ms3rd
https://www.googletagmanager.com/gtag/js?id=G-N116K2C2SM&cx=c&gtm=4e692166ms51ms9ms3rd
F
JS Bundles
Action
86 scripts, 1.5 MB unused
FIX
86 scripts, 1.5 MB unused
Warning::
https://c77.bookbot.com/_next/static/chunks/5581-9...: 140 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://c77.bookbot.com/_next/static/chunks/5581-9...: 140 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 75 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-N116...: 73 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-000&...: 68 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.5 MB
1570 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://c77.bookbot.com/_next/static/chunks/5581-97516c68459cf988.js52 KB140 KB (75%)✓3rd
https://c77.bookbot.com/_next/static/chunks/5581-97516c68459cf988.js0 KB140 KB (75%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-894320112&cx=c&gtm=4e6921158 KB75 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-N116K2C2SM&cx=c&gtm=4e6921182 KB73 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-000&cx=c&gtm=4e6921147 KB68 KB (46%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TF5RV29196 KB65 KB (33%)✓3rd
https://c77.bookbot.com/_next/static/chunks/pages/p/%5B%5B...filters%5D%5D-df29e75b4fe3bbb2.js0 KB64 KB (69%)✓3rd
https://c77.bookbot.com/_next/static/chunks/pages/p/%5B%5B...filters%5D%5D-df29e75b4fe3bbb2.js26 KB64 KB (69%)✓3rd
https://c77.bookbot.com/_next/static/chunks/4586-e8ea1f603aeb7f0a.js0 KB62 KB (56%)✓3rd
https://c77.bookbot.com/_next/static/chunks/4586-e8ea1f603aeb7f0a.js24 KB62 KB (56%)✓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
161 resources · 2.4 MB · 1.5 MB savings available
FIX
161 resources · 2.4 MB · 1.5 MB savings available
Warning::
Page weight 2.4 MB exceeds 1 MB target by 1.4 MB
Got: 2.4 MB Expected: ≤ 1 MB
Info::
~1.5 MB of savings available
Warning::
153 third-party resources (98% of weight)
161 resources · 2.4 MiB · 153 third-party 1.4 MiB over 1MB target
JavaScript 73% · 1.8 MiB
Image 15% · 374.8 KiB
CSS 7% · 164.6 KiB
Font 4% · 105.4 KiB
Document 1% · 35.4 KiB
Other 0% · 7.8 KiB

~1.5 MiB of savings available

Remove unused JavaScript: 1.5 MiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, no-cache, no-store, max-age=0, must-revalidate
Info::
ETag present — enables conditional (304) responses
Cache-Control

private, no-cache, no-store, max-age=0, must-revalidate

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
no-cache—Cache but always revalidate first
no-store—Never cache this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
B
Image Optimization
25 images, 0 KB saveable
REVIEW
25 images, 0 KB saveable
Info::
All images are well-optimized
25 images 370 KB
0 oversized -0 KB
8 legacy format
0 missing dimensions CLS risk
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
B
Compression Algorithm
Main response uses gzip; brotli would be ~20% smaller
REVIEW
Main response uses gzip; brotli would be ~20% smaller
Info::
Main HTML response uses gzip (brotli would be ~20% smaller)
All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
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
4 fonts (105 KB)
PASS
4 fonts (105 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

105 KB total

Render-blocking

0

of 4

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 s FCP 761 ms LCP 1.6 shttps://c77.bookbot.com/_next/static/media/95d1875af7c44e92-s.p.woff295d1875af7c44e92-s.p.woff2 https://c77.bookbot.com/_next/static/media/95d1875af7c44e92-s.p.woff2 — 26.4 KiB — 158 ms — font-display: swaphttps://c77.bookbot.com/_next/static/media/630c17af355fa44e-s.p.woff2630c17af355fa44e-s.p.woff2 https://c77.bookbot.com/_next/static/media/630c17af355fa44e-s.p.woff2 — 42.6 KiB — 190 ms — font-display: swaphttps://c77.bookbot.com/_next/static/media/346ae887e89b3c48-s.p.woff2346ae887e89b3c48-s.p.woff2 https://c77.bookbot.com/_next/static/media/346ae887e89b3c48-s.p.woff2 — 13.2 KiB — 192 ms — font-display: swaphttps://c77.bookbot.com/_next/static/media/8a3e7529b362bc07-s.p.woff28a3e7529b362bc07-s.p.woff2 https://c77.bookbot.com/_next/static/media/8a3e7529b362bc07-s.p.woff2 — 23.2 KiB — 246 ms — font-display: swap
95d1875af7c44e92-s.p.woff2 woff2 swap
Size 26 KB
Load time 158 ms
Start 172 ms
Risk FOUT — text flashes from fallback to web font
630c17af355fa44e-s.p.woff2 woff2 swap
Size 43 KB
Load time 190 ms
Start 173 ms
Risk FOUT — text flashes from fallback to web font
346ae887e89b3c48-s.p.woff2 woff2 swap
Size 13 KB
Load time 192 ms
Start 173 ms
Risk FOUT — text flashes from fallback to web font
8a3e7529b362bc07-s.p.woff2 woff2 swap
Size 23 KB
Load time 246 ms
Start 174 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Main HTML Cache-Control
Main HTML uses no-store -- correct for sensitive/dynamic content
PASS
Main HTML uses no-store -- correct for sensitive/dynamic content
Info::
Main HTML uses no-store -- correct for sensitive/dynamic content
Got: private, no-cache, no-store, max-age=0, must-revalidate
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: Accept-Encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
`ETag` present -- conditional GET supported
Network Waterfall
161 requests over 2811ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 761 ms LCP 1.6 shttps://knihobot.cz// https://knihobot.cz/ — 200 — 35.4 KiB — 191 ms — h2https://strapi-c77.bookbot.com/medium_Klub_4_e5785e33bb.jpgstrapi-c77.bookbot.com/medium_Klub_... https://strapi-c77.bookbot.com/medium_Klub_4_e5785e33bb.jpg — 200 — 33.1 KiB — 139 ms — h2https://strapi-c77.bookbot.com/medium_CZ_Knihobot_millennials_HB_banner_1600x1300_view_1_34a77663e3.jpgstrapi-c77.bookbot.com/medium_CZ_Kn... https://strapi-c77.bookbot.com/medium_CZ_Knihobot_millennials_HB_banner_1600x1300_view_1_34a77663e3.jpg — 200 — 59.8 KiB — 173 ms — h2https://strapi-c77.bookbot.com/medium_CZ_Knihobot_Alza_HB_banner_1600x1300_view_1_1_710dea73fb.jpgstrapi-c77.bookbot.com/medium_CZ_Kn... https://strapi-c77.bookbot.com/medium_CZ_Knihobot_Alza_HB_banner_1600x1300_view_1_1_710dea73fb.jpg — 200 — 46.9 KiB — 184 ms — h2https://c77.bookbot.com/_next/static/media/95d1875af7c44e92-s.p.woff2c77.bookbot.com/_next/static/media/... https://c77.bookbot.com/_next/static/media/95d1875af7c44e92-s.p.woff2 — 200 — 26.4 KiB — 158 ms — h2https://c77.bookbot.com/_next/static/media/630c17af355fa44e-s.p.woff2c77.bookbot.com/_next/static/media/... https://c77.bookbot.com/_next/static/media/630c17af355fa44e-s.p.woff2 — 200 — 42.6 KiB — 190 ms — h2https://c77.bookbot.com/_next/static/media/346ae887e89b3c48-s.p.woff2c77.bookbot.com/_next/static/media/... https://c77.bookbot.com/_next/static/media/346ae887e89b3c48-s.p.woff2 — 200 — 13.2 KiB — 192 ms — h2https://c77.bookbot.com/_next/static/media/8a3e7529b362bc07-s.p.woff2c77.bookbot.com/_next/static/media/... https://c77.bookbot.com/_next/static/media/8a3e7529b362bc07-s.p.woff2 — 200 — 23.2 KiB — 246 ms — h2https://c77.bookbot.com/_next/static/css/bb22fe22a5be5034.cssc77.bookbot.com/_next/static/css/bb... https://c77.bookbot.com/_next/static/css/bb22fe22a5be5034.css — 200 — 40.4 KiB — 165 ms — h2https://c77.bookbot.com/_next/static/css/7546d9584a986825.cssc77.bookbot.com/_next/static/css/75... https://c77.bookbot.com/_next/static/css/7546d9584a986825.css — 200 — 9.4 KiB — 171 ms — h2https://c77.bookbot.com/_next/static/css/57a1ce0d207a9847.cssc77.bookbot.com/_next/static/css/57... https://c77.bookbot.com/_next/static/css/57a1ce0d207a9847.css — 200 — 6.9 KiB — 182 ms — h2https://c77.bookbot.com/_next/static/css/bf4b558c1bd6b5b8.cssc77.bookbot.com/_next/static/css/bf... https://c77.bookbot.com/_next/static/css/bf4b558c1bd6b5b8.css — 200 — 2.5 KiB — 181 ms — h2https://c77.bookbot.com/_next/static/css/47143a7ead0d091f.cssc77.bookbot.com/_next/static/css/47... https://c77.bookbot.com/_next/static/css/47143a7ead0d091f.css — 200 — 6.4 KiB — 182 ms — h2https://c77.bookbot.com/_next/static/css/51c6b0b5ed325015.cssc77.bookbot.com/_next/static/css/51... https://c77.bookbot.com/_next/static/css/51c6b0b5ed325015.css — 200 — 2.4 KiB — 181 ms — h2https://c77.bookbot.com/_next/static/css/e442df73cda792e1.cssc77.bookbot.com/_next/static/css/e4... https://c77.bookbot.com/_next/static/css/e442df73cda792e1.css — 200 — 7.7 KiB — 193 ms — h2https://c77.bookbot.com/_next/static/css/9e9b9970f6de2bd0.cssc77.bookbot.com/_next/static/css/9e... https://c77.bookbot.com/_next/static/css/9e9b9970f6de2bd0.css — 200 — 5.3 KiB — 187 ms — h2https://c77.bookbot.com/_next/static/css/a3faf7aae695dcd9.cssc77.bookbot.com/_next/static/css/a3... https://c77.bookbot.com/_next/static/css/a3faf7aae695dcd9.css — 200 — 9.0 KiB — 187 ms — h2https://knihobot.cz/icons.889d67ac8189.svg/icons.889d67ac8189.svg https://knihobot.cz/icons.889d67ac8189.svg — 200 — 13.1 KiB — 74 ms — h2https://knihobot.cz/favicons/site.webmanifest/favicons/site.webmanifest https://knihobot.cz/favicons/site.webmanifest — 200 — 619 B — 88 ms — h2https://knihobot.cz/icons.889d67ac8189.svg/icons.889d67ac8189.svg https://knihobot.cz/icons.889d67ac8189.svg — 200 — 0 B — 56 ms — h2https://cms.knihobot.cz/wp-content/uploads/2026/02/CZ_watch-dog-banner-web.webpcms.knihobot.cz/wp-content/uploads/... https://cms.knihobot.cz/wp-content/uploads/2026/02/CZ_watch-dog-banner-web.webp — 200 — 41.3 KiB — 216 ms — h2https://c77.bookbot.com/i18n/cs.64dda81b9c6c.jsc77.bookbot.com/i18n/cs.64dda81b9c6... https://c77.bookbot.com/i18n/cs.64dda81b9c6c.js — 200 — 75.0 KiB — 115 ms — h2https://c77.bookbot.com/_next/static/chunks/webpack-43c7443d59070e46.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/webpack-43c7443d59070e46.js — 200 — 8.2 KiB — 112 ms — h2https://c77.bookbot.com/_next/static/chunks/framework-c6c82aad00023883.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/framework-c6c82aad00023883.js — 200 — 44.7 KiB — 115 ms — h2https://c77.bookbot.com/_next/static/chunks/main-9b896f863166457a.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/main-9b896f863166457a.js — 200 — 37.8 KiB — 116 ms — h2https://c77.bookbot.com/_next/static/chunks/sentry-a0e22e7025d8711c.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/sentry-a0e22e7025d8711c.js — 200 — 17.3 KiB — 114 ms — h2https://c77.bookbot.com/_next/static/chunks/pages/_app-3f66b878bb9e3ed3.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/pages/_app-3f66b878bb9e3ed3.js — 200 — 144.4 KiB — 123 ms — h2https://c77.bookbot.com/_next/static/chunks/7870-0e246a8f1f3005b1.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/7870-0e246a8f1f3005b1.js — 200 — 14.2 KiB — 117 ms — h2https://c77.bookbot.com/_next/static/chunks/6720-48418f5113443fe5.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/6720-48418f5113443fe5.js — 200 — 4.5 KiB — 118 ms — h2https://c77.bookbot.com/_next/static/chunks/9799-35b629520a98b2cd.jsc77.bookbot.com/_next/static/chunks... 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5.5 KiB — 34 ms — h2https://c77.bookbot.com/_next/static/chunks/6669-b35c29db4640ae70.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/6669-b35c29db4640ae70.js — 200 — 0 B — 28 ms — h2https://c77.bookbot.com/_next/static/chunks/8415-1a901a9eb3ec24e7.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/8415-1a901a9eb3ec24e7.js — 200 — 0 B — 29 ms — h2https://c77.bookbot.com/_next/static/chunks/253-d449381feaaf6326.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/253-d449381feaaf6326.js — 200 — 0 B — 38 ms — h2https://c77.bookbot.com/_next/static/chunks/1166-4e343ee8584319cb.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/1166-4e343ee8584319cb.js — 200 — 0 B — 39 ms — h2https://c77.bookbot.com/_next/static/chunks/8531-eabf4dbcac59b040.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/8531-eabf4dbcac59b040.js — 200 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https://c77.bookbot.com/_next/static/css/fcd611d03318a673.css — 200 — 9.8 KiB — 34 ms — h2https://c77.bookbot.com/_next/static/chunks/2826-0a42107f64573e3a.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/2826-0a42107f64573e3a.js — 200 — 0 B — 38 ms — h2https://c77.bookbot.com/_next/static/chunks/2606-73fb6db06fc090ae.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/2606-73fb6db06fc090ae.js — 200 — 0 B — 42 ms — h2https://c77.bookbot.com/_next/static/chunks/5581-97516c68459cf988.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/5581-97516c68459cf988.js — 200 — 0 B — 45 ms — h2https://c77.bookbot.com/_next/static/chunks/pages/g/%5Bid%5D/b/%5BbookId%5D-7ca583e2616a9d0a.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/pages/g/%5Bid%5D/b/%5BbookId%5D-7ca583e2616a9d0a.js — 200 — 0 B — 42 ms — 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https://mhubc.knihobot.cz/api/proxy/g/collect?v=2&tid=G-N116K2C2SM&gtm=45je6921v886665513z8835634245za20gzb835634245zd835634245&_p=1788857253867&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&ecid=11505300&_eu=AAAAAGA&_fplc=0&cid=1509706132.1788857255&frm=0&pscdl=denied&rcb=14&sr=800x600&uaa=x86&uab=64&uafvl=Not%253FA_Brand%3B24.0.0.0%7CChromium%3B152.0.7977.82&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&ur=ES-MD&sst.rnd=1260323583.1788857255&sst.gch=1&sst.etld=google.es&sst.gcsub=region1&sst.tft=1788857253867&sst.lpc=188721650&sst.navt=n&sst.ude=0&gaf=2&_s=2&tag_exp=115616986~115938465~115938468~118897920~118897930~120213116~120385422~120469145~120469153&dr=&sid=1788857255&sct=1&seg=0&dl=https%3A%2F%2Fknihobot.cz%2F&dt=Knihobot%20antikvari%C3%A1t%20online%20%7C%20vrac%C3%ADme%20knihy%20do%20ob%C4%9Bhu%20-%20knihobot.cz&_tu=hA&en=ux_page_view&gap.sstd=2&ep.gtm_event=gtm.js%20%7C%20GA4%20-%20konfigurace&ep.user_identification=anonymous&ep.content_group=Homepage&epn.fe_timestamp=1788857255162&ep.unique_event_id=437579499-3.1788857255162&_et=4&tfd=2747&richsstsse — 202 — 122 B — 62 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
73% of JavaScript execution is third-party
First-party Third-party 1501ms · 608KB · Kč603/mo
c77.bookbot.com
Other
Costly
Execution 1148ms
Transfer 45 KB
Monthly Cost Kč461/mo
Google Tag Manager
Tag Manager
Optional
Execution 102ms
Transfer 196 KB
Unused 33%
Monthly Cost Kč41/mo
c77.bookbot.com
Other
Optional
Execution 99ms
Transfer 40 KB
Unused 57%
Monthly Cost Kč40/mo
c77.bookbot.com
Other
Optional
Execution 86ms
Transfer 144 KB
Unused 43%
Monthly Cost Kč35/mo
Google Tag Manager
Tag Manager
Optional
Execution 66ms
Transfer 182 KB
Unused 40%
Monthly Cost Kč27/mo

These scripts may cost more than they're worth

  • c77.bookbot.com adds 1148ms and costs ~Kč461/month

73% 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

c77.bookbot.com takes 1148ms 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 c77.bookbot.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

How third-party costs are calculated

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-08-10 — 2026-09-06)

LCP (p75)

1841 ms

87% good

INP (p75)

463 ms

38% good

CLS (p75)

0.100

74% good

FCP (p75)

1723 ms

TTFB (p75)

760 ms

Image Optimization
24 images, 240 KB total, 109 KB wasted
INFO

Image Optimization Audit

Total Images

24

Total Size

240 KB

Oversized

4

Wasted

109 KB

1 missing alt text 14 missing dimensions 11 missing lazy loading
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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