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Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
6
REVIEW
6
PASS
11
INFO
4

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

Mobile Desktop
32
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

3.65 s

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

16.86 s

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

2.71 s

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.

6.99 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.

17.34 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
27
11 PASS 6 REVIEW 6 FIX
D
Page Weight Budget
Action
2.3 MB transferred, 128 requests
FIX
2.3 MB transferred, 128 requests
Info::
Page weighs 8.0 MB (2.3 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::
128 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.48 g CO2 per page load
2.3 MB / 2.4 MB budget
2.3 MB transferred
128 requests
0.48 g CO2 per page load
JavaScript 1.5 MiB 64%
Images 353.9 KiB 15%
Other 204.9 KiB 9%
Fonts 105.4 KiB 4%
CSS 104.0 KiB 4%
HTML 35.3 KiB 1%
Other 31.9 KiB 1%
Other 3.1 KiB 0%
Other 619 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

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 (2.2 MiB of 2.3 MiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-party
F
JS Execution Cost
Action
6096ms total JS execution
FIX
6096ms total JS execution
Warning::
https://c77.bookbot.com/_next/static/chunks/framew...: 2704ms CPU time
Warning::
https://knihobot.cz/: 719ms CPU time
Warning::
Unattributable: 698ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TF5...: 458ms CPU time
Warning::
https://c77.bookbot.com/_next/static/chunks/pages/...: 336ms CPU time
Warning::
Third-party scripts: 4678ms (77% of total)

Main Thread Breakdown

Script Evaluation 48% Other 32% Style & Layout 9% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://c77.bookbot.com/_next/static/chunks/framework-c6c82aad00023883.js2704ms1382ms9ms3rd
https://knihobot.cz/719ms7ms1ms1st
Unattributable698ms49ms0ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-TF5RV29458ms398ms54ms3rd
https://c77.bookbot.com/_next/static/chunks/pages/_app-3f66b878bb9e3ed3.js336ms145ms36ms3rd
https://www.googletagmanager.com/gtag/js?id=G-N116K2C2SM&cx=c&gtm=4e6921h1248ms211ms34ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-894320112&cx=c&gtm=4e6921h1207ms169ms36ms3rd
https://c77.bookbot.com/_next/static/chunks/pages/index-c9875874d13834ca.js181ms158ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-000&cx=c&gtm=4e6921h1171ms143ms27ms3rd
https://c77.bookbot.com/_next/static/chunks/main-9b896f863166457a.js87ms73ms8ms3rd

Showing top 10 of 14 scripts

F
JS Bundles
Action
65 scripts, 1.3 MB unused
FIX
65 scripts, 1.3 MB unused
Warning::
https://c77.bookbot.com/_next/static/chunks/5581-9...: 138 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://c77.bookbot.com/_next/static/chunks/5581-9...: 138 KB unused (73%)
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: 1.3 MB
1296 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://c77.bookbot.com/_next/static/chunks/5581-97516c68459cf988.js52 KB138 KB (73%)✓3rd
https://c77.bookbot.com/_next/static/chunks/5581-97516c68459cf988.js0 KB138 KB (73%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-894320112&cx=c&gtm=4e6921h1158 KB75 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-N116K2C2SM&cx=c&gtm=4e6921h1182 KB73 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-000&cx=c&gtm=4e6921h1147 KB68 KB (46%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TF5RV29196 KB65 KB (33%)✓3rd
https://c77.bookbot.com/_next/static/chunks/4586-e8ea1f603aeb7f0a.js0 KB63 KB (56%)✓3rd
https://c77.bookbot.com/_next/static/chunks/4586-e8ea1f603aeb7f0a.js24 KB63 KB (56%)✓3rd
https://c77.bookbot.com/_next/static/chunks/pages/_app-3f66b878bb9e3ed3.js144 KB62 KB (43%)✓3rd
https://c77.bookbot.com/_next/static/chunks/pages/sell-books-b3e6559af12f4c3c.js23 KB57 KB (73%)✓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
128 resources · 2.3 MB · 1.3 MB savings available
FIX
128 resources · 2.3 MB · 1.3 MB savings available
Warning::
Page weight 2.3 MB exceeds 1 MB target by 1.3 MB
Got: 2.3 MB Expected: ≤ 1 MB
Info::
~1.3 MB of savings available
Warning::
121 third-party resources (98% of weight)
128 resources · 2.3 MiB · 121 third-party 1.3 MiB over 1MB target
JavaScript 73% · 1.7 MiB
Image 15% · 358.3 KiB
CSS 6% · 134.9 KiB
Font 4% · 105.4 KiB
Document 1% · 35.3 KiB
Other 0% · 4.8 KiB

~1.3 MiB of savings available

Remove unused JavaScript: 1.3 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
17 images, 0 KB saveable
REVIEW
17 images, 0 KB saveable
Info::
All images are well-optimized
17 images 354 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.
B
JavaScript Blocking
2 JS blocking issue(s) detected
REVIEW
2 JS blocking issue(s) detected
Warning::
6 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
Warning::
Total JS execution time is 6.1 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 3.6 s LCP 16.9 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 — 159 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 — 219 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 — 294 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 — 294 ms — font-display: swap
95d1875af7c44e92-s.p.woff2 woff2 swap
Size 26 KB
Load time 159 ms
Start 305 ms
Risk FOUT — text flashes from fallback to web font
630c17af355fa44e-s.p.woff2 woff2 swap
Size 43 KB
Load time 219 ms
Start 305 ms
Risk FOUT — text flashes from fallback to web font
346ae887e89b3c48-s.p.woff2 woff2 swap
Size 13 KB
Load time 294 ms
Start 306 ms
Risk FOUT — text flashes from fallback to web font
8a3e7529b362bc07-s.p.woff2 woff2 swap
Size 23 KB
Load time 294 ms
Start 306 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
30 hints, 0 missing preconnects
PASS
30 hints, 0 missing preconnects
Info::
Page uses 30 resource hint(s)

Current Resource Hints

preconnect
4
preload
+4
14
dns-prefetch
3
prefetch
9

30 resource hints configured

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
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
CSS Performance Depth
1 CSS depth issue(s) detected
PASS
1 CSS depth issue(s) detected
Warning::
16 render-blocking stylesheet(s) -- recommended: <=3
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
Network Waterfall
128 requests over 2936ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 3.6 s LCP 16.9 shttps://knihobot.cz// https://knihobot.cz/ — 200 — 35.3 KiB — 286 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 — 295 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 — 295 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 — 310 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 — 159 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 — 219 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 — 294 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 — 294 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 — 40.3 KiB — 164 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 — 218 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 — 306 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 — 300 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 — 306 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 — 303 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 — 304 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 — 304 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 — 299 ms — h2https://knihobot.cz/icons.889d67ac8189.svg/icons.889d67ac8189.svg https://knihobot.cz/icons.889d67ac8189.svg — 200 — 13.1 KiB — 126 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 — 291 ms — h2https://knihobot.cz/icons.889d67ac8189.svg/icons.889d67ac8189.svg https://knihobot.cz/icons.889d67ac8189.svg — 200 — 0 B — 117 ms — h2https://knihobot.cz/favicons/site.webmanifest/favicons/site.webmanifest https://knihobot.cz/favicons/site.webmanifest — 200 — 619 B — 132 ms — h2https://c77.bookbot.com/logos/knihobot/green/logo-cs.svgc77.bookbot.com/logos/knihobot/gree... https://c77.bookbot.com/logos/knihobot/green/logo-cs.svg — 200 — 2.5 KiB — 177 ms — h2https://c77.bookbot.com/logos/bookbots-green.svgc77.bookbot.com/logos/bookbots-gree... https://c77.bookbot.com/logos/bookbots-green.svg — 200 — 5.9 KiB — 178 ms — h2https://c77.bookbot.com/_next/static/media/blob-2.4eac3eed.pngc77.bookbot.com/_next/static/media/... https://c77.bookbot.com/_next/static/media/blob-2.4eac3eed.png — 200 — 18.4 KiB — 178 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 — 180 ms — 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https://c77.bookbot.com/_next/static/chunks/f69bbb46-db551f39eee35ab4.js — 200 — 0 B — 3 ms — h2https://c77.bookbot.com/_next/static/chunks/4586-e8ea1f603aeb7f0a.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/4586-e8ea1f603aeb7f0a.js — 200 — 0 B — 3 ms — h2https://c77.bookbot.com/_next/static/chunks/7658-ad11b1418a62070c.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/7658-ad11b1418a62070c.js — 200 — 0 B — 9 ms — h2https://c77.bookbot.com/_next/static/chunks/5896-5fce3591cb6450d6.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/5896-5fce3591cb6450d6.js — 200 — 0 B — 9 ms — h2https://c77.bookbot.com/_next/static/chunks/1618-42a82ab56d2363c2.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/1618-42a82ab56d2363c2.js — 200 — 0 B — 10 ms — h2https://c77.bookbot.com/_next/static/chunks/pages/sell-books-b3e6559af12f4c3c.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/pages/sell-books-b3e6559af12f4c3c.js — 200 — 0 B — 17 ms — h2https://c77.bookbot.com/_next/static/css/db6d20610ca90e8a.cssc77.bookbot.com/_next/static/css/db... https://c77.bookbot.com/_next/static/css/db6d20610ca90e8a.css — 200 — 2.7 KiB — 26 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 — 13 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 — 13 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 — 14 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 — 14 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 — 13 ms — h2https://c77.bookbot.com/_next/static/css/a72edf16851eb079.cssc77.bookbot.com/_next/static/css/a7... https://c77.bookbot.com/_next/static/css/a72edf16851eb079.css — 200 — 5.8 KiB — 31 ms — h2https://c77.bookbot.com/_next/static/css/c8308b913af693d9.cssc77.bookbot.com/_next/static/css/c8... https://c77.bookbot.com/_next/static/css/c8308b913af693d9.css — 200 — 12.2 KiB — 33 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
77% of JavaScript execution is third-party
First-party Third-party 4678ms · 1091KB · Kč1879/mo
c77.bookbot.com
Other
Costly
Execution 2704ms
Transfer 45 KB
Monthly Cost Kč1086/mo
Google Tag Manager
Tag Manager
Costly
Execution 458ms
Transfer 196 KB
Unused 33%
Monthly Cost Kč184/mo
c77.bookbot.com
Other
Costly
Execution 336ms
Transfer 144 KB
Unused 43%
Monthly Cost Kč135/mo
Google Tag Manager
Tag Manager
Costly
Execution 248ms
Transfer 182 KB
Unused 40%
Monthly Cost Kč100/mo
Google Tag Manager
Tag Manager
Costly
Execution 207ms
Transfer 158 KB
Unused 47%
Monthly Cost Kč83/mo
c77.bookbot.com
Other
Costly
Execution 181ms
Transfer 8 KB
Monthly Cost Kč73/mo
Google Tag Manager
Tag Manager
Costly
Execution 171ms
Transfer 147 KB
Unused 46%
Monthly Cost Kč69/mo
c77.bookbot.com
Other
Optional
Execution 87ms
Transfer 38 KB
Monthly Cost Kč35/mo
l.seznam.cz
Other
Optional
Execution 86ms
Transfer 69 KB
Unused 57%
Monthly Cost Kč35/mo
l.seznam.cz
Other
Optional
Execution 75ms
Transfer 103 KB
Unused 42%
Monthly Cost Kč30/mo
c77.bookbot.com
Other
Optional
Execution 63ms
Transfer 0 KB
Unused 73%
Monthly Cost Kč25/mo
c77.bookbot.com
Other
Optional
Execution 61ms
Transfer 0 KB
Unused 73%
Monthly Cost Kč24/mo

These scripts may cost more than they're worth

  • c77.bookbot.com adds 2704ms and costs ~Kč1086/month
  • Google Tag Manager adds 458ms and costs ~Kč184/month
  • c77.bookbot.com adds 336ms and costs ~Kč135/month
  • Google Tag Manager adds 248ms and costs ~Kč100/month
  • Google Tag Manager adds 207ms and costs ~Kč83/month
  • c77.bookbot.com adds 181ms and costs ~Kč73/month
  • Google Tag Manager adds 171ms and costs ~Kč69/month

77% 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 2704ms 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

Google Tag Manager takes 458ms 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

c77.bookbot.com takes 336ms 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

Google Tag Manager takes 248ms 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

Google Tag Manager takes 207ms 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

c77.bookbot.com takes 181ms 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

Google Tag Manager takes 171ms 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 l.seznam.cz'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

73% 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

73% 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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