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Performance

· 24 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
6
REVIEW
5
PASS
9
INFO
4

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

Mobile Desktop
69
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
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.

754 ms

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

1.58 s

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

606 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.

1.42 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.

3.11 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
24
9 PASS 5 REVIEW 6 FIX
D
Page Weight Budget
Action
2.4 MB transferred, 161 requests
FIX
2.4 MB transferred, 161 requests
Info::
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 366.1 KiB 15%
Other 295.7 KiB 12%
Fonts 105.4 KiB 4%
CSS 104.0 KiB 4%
Other 61.6 KiB 2%
HTML 35.3 KiB 1%
Other 6.3 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 (2.4 MiB of 2.4 MiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-party
D
JS Execution Cost
Action
2399ms total JS execution
FIX
2399ms total JS execution
Warning::
https://c77.bookbot.com/_next/static/chunks/framew...: 1417ms CPU time
Warning::
https://knihobot.cz/: 397ms CPU time
Info::
Unattributable: 180ms CPU time
Info::
https://c77.bookbot.com/_next/static/chunks/5803-4...: 123ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-TF5...: 111ms CPU time
Warning::
Third-party scripts: 1822ms (76% 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.js1417ms601ms3ms3rd
https://knihobot.cz/397ms2ms1ms1st
Unattributable180ms6ms0ms1st
https://c77.bookbot.com/_next/static/chunks/5803-44b4c941d125f4db.js123ms48ms2ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TF5RV29111ms96ms13ms3rd
https://c77.bookbot.com/_next/static/chunks/pages/_app-3f66b878bb9e3ed3.js100ms40ms9ms3rd
https://www.googletagmanager.com/gtag/js?id=G-N116K2C2SM&cx=c&gtm=4e6930h271ms57ms10ms3rd
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/5581-5...: 140 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://c77.bookbot.com/_next/static/chunks/5581-5...: 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...: 72 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-000&...: 69 KB unused (47%)
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/5581-5141ebacfaf076b5.js52 KB140 KB (75%)✓3rd
https://c77.bookbot.com/_next/static/chunks/5581-5141ebacfaf076b5.js0 KB140 KB (75%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-894320112&cx=c&gtm=4e6930h2159 KB75 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-N116K2C2SM&cx=c&gtm=4e6930h2182 KB72 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-000&cx=c&gtm=4e6930h2147 KB69 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 KB62 KB (56%)✓3rd
https://c77.bookbot.com/_next/static/chunks/4586-e8ea1f603aeb7f0a.js0 KB62 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/p/%5B%5B...filters%5D%5D-df29e75b4fe3bbb2.js26 KB62 KB (67%)✓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% · 370.5 KiB
CSS 7% · 164.6 KiB
Font 4% · 105.4 KiB
Document 1% · 35.3 KiB
Other 0% · 8.0 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 366 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 500 ms 1.0 s 1.5 s FCP 754 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 — 151 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 — 191 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 — 243 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 — 242 ms — font-display: swap
95d1875af7c44e92-s.p.woff2 woff2 swap
Size 26 KB
Load time 151 ms
Start 198 ms
Risk FOUT — text flashes from fallback to web font
630c17af355fa44e-s.p.woff2 woff2 swap
Size 43 KB
Load time 191 ms
Start 198 ms
Risk FOUT — text flashes from fallback to web font
346ae887e89b3c48-s.p.woff2 woff2 swap
Size 13 KB
Load time 243 ms
Start 198 ms
Risk FOUT — text flashes from fallback to web font
8a3e7529b362bc07-s.p.woff2 woff2 swap
Size 23 KB
Load time 242 ms
Start 198 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
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
Network Waterfall
161 requests over 3262ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 754 ms LCP 1.6 shttps://knihobot.cz// https://knihobot.cz/ — 200 — 35.3 KiB — 217 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 — 242 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 — 254 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 — 254 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 — 151 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 — 191 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 — 243 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 — 242 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 — 157 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 — 169 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 — 251 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 — 248 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 — 251 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 — 248 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 — 250 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 — 249 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 — 248 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 — 66 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 — 234 ms — h2https://c77.bookbot.com/i18n/cs.1b36f6eada48.jsc77.bookbot.com/i18n/cs.1b36f6eada4... https://c77.bookbot.com/i18n/cs.1b36f6eada48.js — 200 — 75.1 KiB — 151 ms — h2https://c77.bookbot.com/_next/static/chunks/webpack-2c5fe566025f443b.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/webpack-2c5fe566025f443b.js — 200 — 8.2 KiB — 149 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 — 151 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 — 154 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 — 155 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 — 185 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 — 172 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 — 173 ms — h2https://c77.bookbot.com/_next/static/chunks/9799-35b629520a98b2cd.jsc77.bookbot.com/_next/static/chunks... 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https://pagead2.googlesyndication.com/ccm/collect?rcb=17&frm=0&apvc=0&ae=g&tid=AW-894320112&en=gtm.dom&dl=https%3A%2F%2Fknihobot.cz%2F&scrsrc=www.googletagmanager.com&rnd=565610423.1788874774&navt=n&npa=1&ep.ecomm_prodid=&ep.ecomm_pagetype=home&ep.ecomm_totalvalue=0&_tu=CA&gtm=45be6930h2v9103728426z8835634245za20gzb835634245zd835634245xea&gcs=G100&gcd=13p3p3V2p5l1&dma_cps=-&dma=1&tag_exp=115616985~115938465~115938468~118897920~118897930~120213116~120385422~120412528~120469145~120469153&tft=1788874774806&tfd=2828&tids=AW-894320112&fmt=8 — 200 — 21 B — 40 ms — h3https://c77.bookbot.com/_next/static/chunks/pages/login-dd972ecbaa155a03.jsc77.bookbot.com/_next/static/chunks... https://c77.bookbot.com/_next/static/chunks/pages/login-dd972ecbaa155a03.js — 200 — 0 B — 7 ms — h2https://c77.bookbot.com/_next/static/css/bd26dbb6ddb1b7ab.cssc77.bookbot.com/_next/static/css/bd... https://c77.bookbot.com/_next/static/css/bd26dbb6ddb1b7ab.css — 200 — 934 B — 26 ms — 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h2https://mhubc.knihobot.cz/api/proxy/g/collect?v=2&tid=G-N116K2C2SM&gtm=45je6930h2v886665513z8835634245za20gzb835634245zd835634245&_p=1788874772853&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&ecid=1576888594&_eu=AAAAAGA&_fplc=0&cid=1186166968.1788874775&frm=0&pscdl=denied&rcb=10&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=565610423.1788874774&sst.gch=1&sst.etld=google.es&sst.gcsub=region1&sst.tft=1788874772853&sst.lpc=188721650&sst.navt=n&sst.ude=0&gaf=2&_s=2&tag_exp=115616986~115938465~115938469~118897920~118897930~120213116~120385423~120469145~120469153&dr=&sid=1788874774&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=1788874774442&ep.unique_event_id=997913736-3.1788874774441&_et=5&tfd=3210&richsstssemhubc.knihobot.cz/api/proxy/g/colle... https://mhubc.knihobot.cz/api/proxy/g/collect?v=2&tid=G-N116K2C2SM&gtm=45je6930h2v886665513z8835634245za20gzb835634245zd835634245&_p=1788874772853&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&ecid=1576888594&_eu=AAAAAGA&_fplc=0&cid=1186166968.1788874775&frm=0&pscdl=denied&rcb=10&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=565610423.1788874774&sst.gch=1&sst.etld=google.es&sst.gcsub=region1&sst.tft=1788874772853&sst.lpc=188721650&sst.navt=n&sst.ude=0&gaf=2&_s=2&tag_exp=115616986~115938465~115938469~118897920~118897930~120213116~120385423~120469145~120469153&dr=&sid=1788874774&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=1788874774442&ep.unique_event_id=997913736-3.1788874774441&_et=5&tfd=3210&richsstsse — 202 — 152 B — 51 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
76% of JavaScript execution is third-party
First-party Third-party 1822ms · 608KB · Kč732/mo
c77.bookbot.com
Other
Costly
Execution 1417ms
Transfer 45 KB
Monthly Cost Kč569/mo
c77.bookbot.com
Other
Optional
Execution 123ms
Transfer 40 KB
Unused 57%
Monthly Cost Kč49/mo
Google Tag Manager
Tag Manager
Optional
Execution 111ms
Transfer 196 KB
Unused 33%
Monthly Cost Kč45/mo
c77.bookbot.com
Other
Optional
Execution 100ms
Transfer 144 KB
Unused 43%
Monthly Cost Kč40/mo
Google Tag Manager
Tag Manager
Optional
Execution 71ms
Transfer 182 KB
Unused 40%
Monthly Cost Kč29/mo

These scripts may cost more than they're worth

  • c77.bookbot.com adds 1417ms and costs ~Kč569/month

76% 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 1417ms 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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