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Performance

· 28 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
6
REVIEW
5
PASS
13
INFO
4

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

Mobile Desktop
39
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.

2.47 s

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

9.30 s

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

5.67 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.

4.58 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.

17.60 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
28
13 PASS 5 REVIEW 6 FIX
D
Page Weight Budget
Action
2.3 MB transferred, 128 requests
FIX
2.3 MB transferred, 128 requests
Info::
Page weighs 8.1 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 352.8 KiB 15%
Other 205.5 KiB 9%
Fonts 105.4 KiB 4%
CSS 103.9 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
14093ms total JS execution
FIX
14093ms total JS execution
Warning::
https://c77.bookbot.com/_next/static/chunks/framew...: 5734ms CPU time
Warning::
https://knihobot.cz/: 2756ms CPU time
Warning::
https://c77.bookbot.com/_next/static/chunks/pages/...: 1032ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TF5...: 840ms CPU time
Warning::
Unattributable: 832ms CPU time
Warning::
Third-party scripts: 10505ms (75% of total)

Main Thread Breakdown

Script Evaluation 47% Other 28% Style & Layout 15% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://c77.bookbot.com/_next/static/chunks/framework-c6c82aad00023883.js5734ms3498ms22ms3rd
https://knihobot.cz/2756ms11ms2ms1st
https://c77.bookbot.com/_next/static/chunks/pages/_app-3f66b878bb9e3ed3.js1032ms264ms74ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TF5RV29840ms717ms105ms3rd
Unattributable832ms38ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-N116K2C2SM&cx=c&gtm=4e6921517ms407ms82ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-894320112&cx=c&gtm=4e6921485ms406ms75ms3rd
https://www.googletagmanager.com/gtag/js?id=G-000&cx=c&gtm=4e6921314ms249ms63ms3rd
https://c77.bookbot.com/_next/static/chunks/pages/index-c9875874d13834ca.js303ms295ms3ms3rd
https://c77.bookbot.com/_next/static/chunks/main-9b896f863166457a.js221ms190ms19ms3rd

Showing top 10 of 19 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/5581-5...: 138 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://c77.bookbot.com/_next/static/chunks/5581-5...: 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...: 72 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-000&...: 68 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.3 MB
1300 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://c77.bookbot.com/_next/static/chunks/5581-5141ebacfaf076b5.js0 KB138 KB (73%)✓3rd
https://c77.bookbot.com/_next/static/chunks/5581-5141ebacfaf076b5.js52 KB138 KB (73%)✓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 KB72 KB (39%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-000&cx=c&gtm=4e6921147 KB68 KB (47%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TF5RV29196 KB65 KB (33%)✓3rd
https://c77.bookbot.com/_next/static/chunks/4586-e8ea1f603aeb7f0a.js24 KB63 KB (56%)✓3rd
https://c77.bookbot.com/_next/static/chunks/4586-e8ea1f603aeb7f0a.js0 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.js0 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% · 357.3 KiB
CSS 6% · 134.7 KiB
Font 4% · 105.4 KiB
Document 1% · 35.3 KiB
Other 0% · 4.7 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 353 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
Document Compression
Document response uses gzip; brotli would be ~20% smaller
REVIEW
Document 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.5 s LCP 9.3 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 — 53 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 — 89 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 — 95 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 — 95 ms — font-display: swap
95d1875af7c44e92-s.p.woff2 woff2 swap
Size 26 KB
Load time 53 ms
Start 477 ms
Risk FOUT — text flashes from fallback to web font
630c17af355fa44e-s.p.woff2 woff2 swap
Size 43 KB
Load time 89 ms
Start 478 ms
Risk FOUT — text flashes from fallback to web font
346ae887e89b3c48-s.p.woff2 woff2 swap
Size 13 KB
Load time 95 ms
Start 478 ms
Risk FOUT — text flashes from fallback to web font
8a3e7529b362bc07-s.p.woff2 woff2 swap
Size 23 KB
Load time 95 ms
Start 479 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
43 hints, 0 missing preconnects
PASS
43 hints, 0 missing preconnects
Info::
12 preconnect hints -- excessive (recommended: <=6)
Each preconnect eagerly opens a TCP+TLS connection. On slow networks or low-end devices, too many parallel connections cause head-of-line blocking and starve the connections that matter for LCP. Trim to the 4-6 highest-value origins (the ones serving render-blocking or LCP resources).
Info::
1 URL(s) appear in multiple hints
The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: https://rezised-images.knhbt.cz (preconnect+preconnect+preconnect+preconnect+preconnect+preconnect+preconnect+preconnect+preconnect).
Info::
Page uses 43 resource hint(s)

Current Resource Hints

preconnect
+2
12
preload
+4
14
dns-prefetch
3
prefetch
+4
14

43 resource hints configured

Each preconnect eagerly opens a TCP+TLS connection. On slow networks or low-end devices, too many parallel connections cause head-of-line blocking and starve the connections that matter for LCP. Trim to the 4-6 highest-value origins (the ones serving render-blocking or LCP resources).

Why this matters

Informational: a labeled value pair from the audit.

The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: https://rezised-images.knhbt.cz (preconnect+preconnect+preconnect+preconnect+preconnect+preconnect+preconnect+preconnect+preconnect).

Why this matters

Performance issues directly impact user engagement and conversion rates.

A
Asset Compression
1 of 2 asset hosts still on gzip
PASS
1 of 2 asset hosts still on gzip
Info::
c77.bookbot.com serves assets with gzip; brotli would be ~20% smaller (assets: 84)
Every current browser accepts brotli. On a CDN this is a per-pull-zone toggle (Cloudflare, Fastly, CloudFront, CDN77, Bunny all expose it); on an origin it needs the brotli module (nginx-brotli, Apache mod_brotli). The saving lands on the assets this host serves, not on the HTML document -- the document's own encoding is reported separately.
Got: c77.bookbot.com (text/javascript)
Info::
www.googletagmanager.com serves assets with brotli (assets: 3)
Got: www.googletagmanager.com (application/javascript)
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
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
Total JS execution time is 14.1 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.
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 4405ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.5 s LCP 9.3 shttps://knihobot.cz// https://knihobot.cz/ — 200 — 35.3 KiB — 458 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 — 124 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 — 117 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 — 46.8 KiB — 150 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 — 53 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 — 89 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 — 95 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 — 95 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 — 96 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 — 79 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 — 79 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 — 68 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 — 78 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 — 75 ms — 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https://c77.bookbot.com/_next/static/css/a72edf16851eb079.css — 200 — 5.8 KiB — 18 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 — 21 ms — h2https://l.seznam.cz/static/js/sem.js?szn_loader=1l.seznam.cz/static/js/sem.js?szn_lo... https://l.seznam.cz/static/js/sem.js?szn_loader=1 — 200 — 68.8 KiB — 511 ms — h2https://mhubc.knihobot.cz/api/proxy/g/collect?v=2&tid=G-N116K2C2SM&gtm=45je6921v886665513z8835634245za20gzb835634245zd835634245&_p=1788874423755&gcs=G100&gcd=13p3p3p3p5l1&npa=1&dma_cps=-&dma=0&ecid=139736574&_eu=AAAAAGA&_fplc=0&are=1&cid=984245999.1788874425&frm=0&pscdl=denied&rcb=10&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&ur=IR-23&sst.rnd=1645303381.1788874425&sst.tft=1788874423755&sst.lpc=188721650&sst.navt=n&sst.ude=0&gaf=2&_s=2&tag_exp=115938465~115938469~118897920~118897930~120213116~120385422~120412528~120469145~120469153&dr=&sid=1788874425&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=1788874424906&ep.unique_event_id=595751423-3.1788874424905&_et=8&tfd=3828&richsstssemhubc.knihobot.cz/api/proxy/g/colle... https://mhubc.knihobot.cz/api/proxy/g/collect?v=2&tid=G-N116K2C2SM&gtm=45je6921v886665513z8835634245za20gzb835634245zd835634245&_p=1788874423755&gcs=G100&gcd=13p3p3p3p5l1&npa=1&dma_cps=-&dma=0&ecid=139736574&_eu=AAAAAGA&_fplc=0&are=1&cid=984245999.1788874425&frm=0&pscdl=denied&rcb=10&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&ur=IR-23&sst.rnd=1645303381.1788874425&sst.tft=1788874423755&sst.lpc=188721650&sst.navt=n&sst.ude=0&gaf=2&_s=2&tag_exp=115938465~115938469~118897920~118897930~120213116~120385422~120412528~120469145~120469153&dr=&sid=1788874425&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=1788874424906&ep.unique_event_id=595751423-3.1788874424905&_et=8&tfd=3828&richsstsse — 202 — 122 B — 103 ms — h2https://knihobot.cz/favicons/favicon.ico/favicons/favicon.ico https://knihobot.cz/favicons/favicon.ico — 200 — 4.4 KiB — 92 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
75% of JavaScript execution is third-party
First-party Third-party 10505ms · 1252KB · Kč4220/mo
c77.bookbot.com
Other
Costly
Execution 5734ms
Transfer 45 KB
Monthly Cost Kč2303/mo
c77.bookbot.com
Other
Costly
Execution 1032ms
Transfer 144 KB
Unused 43%
Monthly Cost Kč414/mo
Google Tag Manager
Tag Manager
Costly
Execution 840ms
Transfer 196 KB
Unused 33%
Monthly Cost Kč337/mo
Google Tag Manager
Tag Manager
Costly
Execution 517ms
Transfer 182 KB
Unused 39%
Monthly Cost Kč208/mo
Google Tag Manager
Tag Manager
Costly
Execution 485ms
Transfer 158 KB
Unused 47%
Monthly Cost Kč195/mo
Google Tag Manager
Tag Manager
Costly
Execution 314ms
Transfer 147 KB
Unused 47%
Monthly Cost Kč126/mo
c77.bookbot.com
Other
Costly
Execution 303ms
Transfer 8 KB
Monthly Cost Kč122/mo
c77.bookbot.com
Other
Costly
Execution 221ms
Transfer 38 KB
Monthly Cost Kč89/mo
c77.bookbot.com
Other
Costly
Execution 154ms
Transfer 40 KB
Unused 58%
Monthly Cost Kč62/mo
c77.bookbot.com
Other
Costly
Execution 153ms
Transfer 0 KB
Unused 73%
Monthly Cost Kč61/mo
l.seznam.cz
Other
Costly
Execution 149ms
Transfer 69 KB
Unused 57%
Monthly Cost Kč60/mo
c77.bookbot.com
Other
Costly
Execution 144ms
Transfer 30 KB
Monthly Cost Kč58/mo
c77.bookbot.com
Other
Costly
Execution 144ms
Transfer 0 KB
Unused 73%
Monthly Cost Kč58/mo
l.seznam.cz
Other
Optional
Execution 119ms
Transfer 103 KB
Unused 42%
Monthly Cost Kč48/mo
c77.bookbot.com
Other
Optional
Execution 77ms
Transfer 15 KB
Monthly Cost Kč31/mo
c77.bookbot.com
Other
Optional
Execution 63ms
Transfer 75 KB
Monthly Cost Kč25/mo
c77.bookbot.com
Other
Optional
Execution 54ms
Transfer 0 KB
Unused 67%
Monthly Cost Kč22/mo

These scripts may cost more than they're worth

  • c77.bookbot.com adds 5734ms and costs ~Kč2303/month
  • c77.bookbot.com adds 1032ms and costs ~Kč414/month
  • Google Tag Manager adds 840ms and costs ~Kč337/month
  • Google Tag Manager adds 517ms and costs ~Kč208/month
  • Google Tag Manager adds 485ms and costs ~Kč195/month
  • Google Tag Manager adds 314ms and costs ~Kč126/month
  • c77.bookbot.com adds 303ms and costs ~Kč122/month
  • c77.bookbot.com adds 221ms and costs ~Kč89/month
  • c77.bookbot.com adds 154ms and costs ~Kč62/month
  • c77.bookbot.com adds 153ms and costs ~Kč61/month
  • l.seznam.cz adds 149ms and costs ~Kč60/month
  • c77.bookbot.com adds 144ms and costs ~Kč58/month
  • c77.bookbot.com adds 144ms and costs ~Kč58/month

75% 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 5734ms 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 1032ms 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 840ms 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 517ms 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 485ms 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 314ms 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 303ms 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 221ms 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 154ms 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

58% 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

c77.bookbot.com takes 153ms 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

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

l.seznam.cz takes 149ms 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

c77.bookbot.com takes 144ms 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 144ms 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

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

67% 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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