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https://psichologie.cz

Performance

· 23 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
3
REVIEW
6
PASS
11
INFO
3

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

Mobile Desktop
70
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.
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.

513 ms

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

754 ms

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

1.75 s

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

0.007

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

686 ms

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

5.99 s

Page Load Progression

505 ms
1.0 s
1.5 s
2.0 s
2.5 s
3.0 s
3.5 s
4.0 s
Checks
23
11 PASS 6 REVIEW 3 FIX
F
Page Weight Budget
Action
6.7 MB transferred, 184 requests
FIX
6.7 MB transferred, 184 requests
Critical::
Page weighs 16.6 MB (6.7 MB transferred)
Info::
Fonts are 959 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 959 KB
Warning::
184 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.4 g CO2 per page load
6.7 MB / 2.4 MB budget
6.7 MB transferred
184 requests
1.4 g CO2 per page load
Other 4.5 MiB 68%
Fonts 959.4 KiB 14%
Images 875.9 KiB 13%
JavaScript 278.7 KiB 4%
HTML 62.2 KiB 1%
CSS 58.6 KiB 1%
Other 2.4 KiB 0%
0 2.4 MB 4.9 MB
Over budget

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
JS Execution Cost
Action
3117ms total JS execution
FIX
3117ms total JS execution
Warning::
https://psichologie.cz/_framework/blazor.web.js: 1829ms CPU time
Warning::
Unattributable: 598ms CPU time
Warning::
https://psichologie.cz/: 366ms CPU time
Warning::
https://psichologie.cz/_framework/dotnet.native.7d...: 324ms CPU time

Main Thread Breakdown

Script Evaluation 72% Other 14% Style & Layout 8% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://psichologie.cz/_framework/blazor.web.js1829ms1728ms3ms1st
Unattributable598ms234ms0ms1st
https://psichologie.cz/366ms4ms0ms1st
https://psichologie.cz/_framework/dotnet.native.7dko1v9rxe.js324ms322ms0ms1st
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: no-cache, no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache, no-store

DirectiveValueMeaning
no-cache—Cache but always revalidate first
no-store—Never cache this response
C
Image Optimization
Action
65 images, 0 KB saveable
REVIEW
65 images, 0 KB saveable
Warning::
https://psichologie.cz/images/psichologie-logo-whi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://psichologie.cz/images/logos/forbes.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://psichologie.cz/images/logos/pozitivni-zpra... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://psichologie.cz/images/book.webp is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://psichologie.cz/images/home/podcast-logo.we... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://psichologie.cz/images/logos/nova.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://psichologie.cz/images/logos/social-impact-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://psichologie.cz/images/logos/ct1.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://psichologie.cz/images/dog-silouethes/doghe... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://psichologie.cz/images/logos/idnes.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://psichologie.cz/images/logos/cesky-rozhlas.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
65 images 872 KB
0 oversized -0 KB
24 legacy format
11 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

B
JS Bundles
12 scripts, 115 KB unused
REVIEW
12 scripts, 115 KB unused
Warning::
https://psichologie.cz/_framework/blazor.web.js: 41 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://psichologie.cz/_framework/dotnet.native.7d...: 38 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://psichologie.cz/_framework/dotnet.native.7d...: unminified — 28 KB could be saved
Warning::
https://psichologie.cz/_framework/dotnet.runtime.z...: 36 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 115 KB
115 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://psichologie.cz/_framework/blazor.web.js55 KB41 KB (74%)✓1st
https://psichologie.cz/_framework/dotnet.native.7dko1v9rxe.js62 KB38 KB (62%)✗1st
https://psichologie.cz/_framework/dotnet.runtime.zbexyp8zrs.js55 KB36 KB (65%)✓1st
https://psichologie.cz/lib/bootstrap/dist/js/bootstrap.bundle.min.t00mg49bzh.js21 KB—✓1st
https://psichologie.cz/js/site.blvc3njm1h.js1 KB—✓1st
https://psichologie.cz/js/cookie-consent.ioqaqduiy7.js2 KB—✓1st
https://d70shl7vidtft.cloudfront.net/ecmtr-2.4.2.js18 KB—✓3rd
https://psichologie.cz/_framework/dotnet.y9uzsa2o1o.js16 KB—✓1st
https://psichologie.cz/_framework/resource-collection.uVZjQ.js44 KB—✓1st
https://psichologie.cz/js/input.utgzzqkzyr.js1 KB—✓1st

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

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
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
Page Weight Inventory
Action
184 resources · 6.7 MB · 115 KB savings available
REVIEW
184 resources · 6.7 MB · 115 KB savings available
Warning::
Page weight 6.7 MB exceeds 1 MB target by 5.7 MB
Got: 6.7 MB Expected: ≤ 1 MB
Info::
~115 KB of savings available
Info::
4 third-party resources (0% of weight)
Info::
5 resources over 200KB
184 resources · 6.7 MiB · 4 third-party 5.7 MiB over 1MB target
Other 68% · 4.5 MiB
Font 14% · 959.4 KiB
Image 13% · 878.3 KiB
JavaScript 4% · 278.7 KiB
Document 1% · 62.2 KiB
CSS 1% · 58.6 KiB

~114.5 KiB of savings available

Remove unused JavaScript: 114.5 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
0% third-party, 0 ms blocking
PASS
0% third-party, 0 ms blocking
Info::
Third-party code accounts for 0% of page weight (32.0 KiB of 6.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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
6 fonts (959 KB)
PASS
6 fonts (959 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

959 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 513 ms LCP 754 mshttps://psichologie.cz/fonts/Poppins-Black.ttfPoppins-Black.ttf https://psichologie.cz/fonts/Poppins-Black.ttf — 148.2 KiB — 70 ms — font-display: swaphttps://psichologie.cz/fonts/Poppins-Regular.ttfPoppins-Regular.ttf https://psichologie.cz/fonts/Poppins-Regular.ttf — 154.9 KiB — 98 ms — font-display: swaphttps://psichologie.cz/fonts/Poppins-Medium.ttfPoppins-Medium.ttf https://psichologie.cz/fonts/Poppins-Medium.ttf — 153.2 KiB — 104 ms — font-display: swaphttps://psichologie.cz/fonts/Poppins-SemiBold.ttfPoppins-SemiBold.ttf https://psichologie.cz/fonts/Poppins-SemiBold.ttf — 151.9 KiB — 99 ms — font-display: swaphttps://psichologie.cz/fonts/Poppins-Italic.ttfPoppins-Italic.ttf https://psichologie.cz/fonts/Poppins-Italic.ttf — 178.1 KiB — 98 ms — font-display: swaphttps://psichologie.cz/icons/remixicon.woff2?t=1734404658139remixicon.woff2 https://psichologie.cz/icons/remixicon.woff2?t=1734404658139 — 173.0 KiB — 64 ms — font-display: swap
Poppins-Black.ttf ttf swap
Size 148 KB
Load time 70 ms
Start 191 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Poppins-Regular.ttf ttf swap
Size 155 KB
Load time 98 ms
Start 356 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Poppins-Medium.ttf ttf swap
Size 153 KB
Load time 104 ms
Start 356 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Poppins-SemiBold.ttf ttf swap
Size 152 KB
Load time 99 ms
Start 357 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Poppins-Italic.ttf ttf swap
Size 178 KB
Load time 98 ms
Start 364 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
remixicon.woff2 woff2 swap
Size 173 KB
Load time 64 ms
Start 569 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~716 KB and ~1432 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Document Compression
Document response uses brotli
PASS
Document response uses brotli
Info::
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
A+
Asset Compression
All 1 asset host use brotli
PASS
All 1 asset host use brotli
Info::
cdn.vidstack.io serves assets with brotli (assets: 4)
Got: cdn.vidstack.io (text/css)
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: no-cache, no-store
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::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
Network Waterfall
184 requests over 3422ms
INFO
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HTML JavaScript CSS Images Fonts XHR/Fetch Other
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)

1144 ms

94% good

INP (p75)

171 ms

76% good

CLS (p75)

0.000

98% good

FCP (p75)

1090 ms

TTFB (p75)

591 ms

This origin passes Core Web Vitals assessment
Image Optimization
116 images, 1657 KB total, 18 KB wasted
INFO

Image Optimization Audit

Total Images

116

Total Size

1657 KB

Oversized

2

Wasted

18 KB

116 missing dimensions 115 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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