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https://www.nspvk.sk

Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
90
GRADE
A
FIX
1
REVIEW
9
PASS
14
INFO
3

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.
68
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.
92
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.

2.55 s

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

8.39 s

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

20 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.

4.51 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.

8.39 s

Page Load Progression

536 ms
1.1 s
1.6 s
2.1 s
2.7 s
3.2 s
3.8 s
4.3 s
Checks
27
14 PASS 9 REVIEW 1 FIX
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Page Weight Budget
1.4 MB transferred, 30 requests
REVIEW
1.4 MB transferred, 30 requests
Info::
Page weighs 1.8 MB (1.4 MB transferred)
Warning::
Images are 1.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.2 MB
Info::
30 HTTP requests
Info::
Estimated 0.30 g CO2 per page load
1.4 MB / 2.4 MB budget
1.4 MB transferred
30 requests
0.30 g CO2 per page load
Images 1.2 MiB 87%
JavaScript 161.0 KiB 11%
CSS 24.2 KiB 2%
HTML 4.4 KiB 0%
Other 1.2 KiB 0%
0 2.4 MB 4.9 MB
Under budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

B
JS Bundles
13 scripts, 76 KB unused
REVIEW
13 scripts, 76 KB unused
Warning::
https://www.nspvk.sk/plugins/my-gallery/swiper/swi...: 33 KB unused (91%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.datatables.net/1.10.11/js/jquery.dataT...: 22 KB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nspvk.sk/admin/template/js/jquery/jque...: 22 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 76 KB
76 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.nspvk.sk/plugins/my-gallery/swiper/swiper-bundle.min.js36 KB33 KB (91%)✓1st
https://cdn.datatables.net/1.10.11/js/jquery.dataTables.min.js27 KB22 KB (84%)✓3rd
https://www.nspvk.sk/admin/template/js/jquery/jquery-3.2.1.min.js?v=3.2.130 KB22 KB (74%)✓1st
https://www.nspvk.sk/plugins/my-gallery/photoswipe/photoswipe.min.js12 KB—✓1st
https://www.nspvk.sk/plugins/my-gallery/photoswipe/photoswipe-ui-default.min.js4 KB—✓1st
https://www.nspvk.sk/plugins/my-gallery/photoswipe/photoswipe-init.js3 KB—✓1st
https://www.nspvk.sk/plugins/my-gallery/baguettebox/baguettebox.js7 KB—✗1st
https://www.nspvk.sk/plugins/my-gallery/functions.js1 KB—✓1st
https://www.nspvk.sk/theme/Flat-svg-arsenic/js/modernizr.js5 KB—✓1st
https://www.nspvk.sk/theme/Flat-svg-arsenic/js/jquery-1.10.2.min.js33 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
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
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
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
30 resources · 1.4 MB · 76 KB savings available
REVIEW
30 resources · 1.4 MB · 76 KB savings available
Warning::
Page weight 1.4 MB exceeds 1 MB target by 428 KB
Got: 1.4 MB Expected: ≤ 1 MB
Info::
~76 KB of savings available
Info::
3 third-party resources (2% of weight)
Info::
2 resources over 200KB
30 resources · 1.4 MiB · 3 third-party 427.5 KiB over 1MB target
Image 87% · 1.2 MiB
JavaScript 11% · 161.0 KiB
CSS 2% · 24.2 KiB
Document 0% · 4.4 KiB

~76.4 KiB of savings available

Remove unused JavaScript: 76.4 KiB
B
JavaScript Blocking
1 JS blocking issue(s) detected
REVIEW
1 JS blocking issue(s) detected
Warning::
13 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.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
2% third-party, 0 ms blocking
PASS
2% third-party, 0 ms blocking
Info::
Third-party code accounts for 2% of page weight (28.9 KiB of 1.4 MiB)
Info::
Third-party blocking time is low (0 ms)
98%
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
Image Optimization
4 images, 0 KB saveable
PASS
4 images, 0 KB saveable
Info::
All images are well-optimized
4 images 1.2 MB
0 oversized -0 KB
3 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
488ms total JS execution
PASS
488ms total JS execution
Info::
Unattributable: 216ms CPU time
Info::
https://www.nspvk.sk/theme/Flat-svg-arsenic/js/jqu...: 160ms CPU time
Info::
https://www.nspvk.sk/: 57ms CPU time
Info::
https://www.nspvk.sk/admin/template/js/jquery/jque...: 54ms CPU time

Main Thread Breakdown

Other 38% Script Evaluation 23% Style & Layout 22% Script Parsing & Compilation 8% Parse HTML & CSS 5% Rendering 3%
ScriptTotalScriptingParse/CompileParty
Unattributable216ms7ms0ms1st
https://www.nspvk.sk/theme/Flat-svg-arsenic/js/jquery-1.10.2.min.js160ms32ms7ms1st
https://www.nspvk.sk/57ms10ms1ms1st
https://www.nspvk.sk/admin/template/js/jquery/jquery-3.2.1.min.js?v=3.2.154ms35ms8ms1st
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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
All 1 asset host use brotli
PASS
All 1 asset host use brotli
Info::
cdn.datatables.net serves assets with brotli (assets: 3)
Got: cdn.datatables.net (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+
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.
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::
7 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
30 requests over 4280ms
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 FCP 2.6 s LCP 8.4 shttps://www.nspvk.sk// https://www.nspvk.sk/ — 200 — 4.4 KiB — 202 ms — http/1.1https://www.nspvk.sk/plugins/my-gallery/baguettebox/baguettebox.css/plugins/my-gallery/baguettebox/bag... https://www.nspvk.sk/plugins/my-gallery/baguettebox/baguettebox.css — 200 — 2.0 KiB — 44 ms — http/1.1https://www.nspvk.sk/plugins/my-gallery/photoswipe/photoswipe.css/plugins/my-gallery/photoswipe/phot... https://www.nspvk.sk/plugins/my-gallery/photoswipe/photoswipe.css — 200 — 2.2 KiB — 50 ms — http/1.1https://www.nspvk.sk/plugins/my-gallery/photoswipe/default-skin/default-skin.css/plugins/my-gallery/photoswipe/defa... https://www.nspvk.sk/plugins/my-gallery/photoswipe/default-skin/default-skin.css — 200 — 3.4 KiB — 92 ms — http/1.1https://www.nspvk.sk/plugins/my-gallery/swiper/swiper-bundle.css/plugins/my-gallery/swiper/swiper-b... https://www.nspvk.sk/plugins/my-gallery/swiper/swiper-bundle.css — 200 — 5.1 KiB — 95 ms — http/1.1https://cdn.datatables.net/1.10.11/css/jquery.dataTables.min.csscdn.datatables.net/1.10.11/css/jque... https://cdn.datatables.net/1.10.11/css/jquery.dataTables.min.css — 200 — 2.1 KiB — 103 ms — h2https://www.nspvk.sk/admin/template/js/jquery/jquery-3.2.1.min.js?v=3.2.1/admin/template/js/jquery/jquery-3.... https://www.nspvk.sk/admin/template/js/jquery/jquery-3.2.1.min.js?v=3.2.1 — 200 — 29.9 KiB — 259 ms — http/1.1https://www.nspvk.sk/plugins/my-gallery/functions.js/plugins/my-gallery/functions.js https://www.nspvk.sk/plugins/my-gallery/functions.js — 200 — 799 B — 173 ms — http/1.1https://www.nspvk.sk/plugins/my-gallery/baguettebox/baguettebox.js/plugins/my-gallery/baguettebox/bag... https://www.nspvk.sk/plugins/my-gallery/baguettebox/baguettebox.js — 200 — 7.3 KiB — 176 ms — http/1.1https://www.nspvk.sk/plugins/my-gallery/photoswipe/photoswipe.min.js/plugins/my-gallery/photoswipe/phot... https://www.nspvk.sk/plugins/my-gallery/photoswipe/photoswipe.min.js — 200 — 12.5 KiB — 213 ms — http/1.1https://www.nspvk.sk/plugins/my-gallery/photoswipe/photoswipe-ui-default.min.js/plugins/my-gallery/photoswipe/phot... https://www.nspvk.sk/plugins/my-gallery/photoswipe/photoswipe-ui-default.min.js — 200 — 4.2 KiB — 174 ms — http/1.1https://www.nspvk.sk/plugins/my-gallery/photoswipe/photoswipe-init.js/plugins/my-gallery/photoswipe/phot... https://www.nspvk.sk/plugins/my-gallery/photoswipe/photoswipe-init.js — 200 — 2.7 KiB — 179 ms — http/1.1https://www.nspvk.sk/plugins/my-gallery/swiper/swiper-bundle.min.js/plugins/my-gallery/swiper/swiper-b... https://www.nspvk.sk/plugins/my-gallery/swiper/swiper-bundle.min.js — 200 — 36.2 KiB — 305 ms — http/1.1https://cdn.datatables.net/1.10.11/js/jquery.dataTables.min.jscdn.datatables.net/1.10.11/js/jquer... https://cdn.datatables.net/1.10.11/js/jquery.dataTables.min.js — 200 — 26.8 KiB — 99 ms — h2https://www.nspvk.sk/theme/Flat-svg-arsenic/js/modernizr.js/theme/Flat-svg-arsenic/js/moderniz... https://www.nspvk.sk/theme/Flat-svg-arsenic/js/modernizr.js — 200 — 5.3 KiB — 218 ms — http/1.1https://www.nspvk.sk/theme/Flat-svg-arsenic/css/style.css/theme/Flat-svg-arsenic/css/style.c... https://www.nspvk.sk/theme/Flat-svg-arsenic/css/style.css — 200 — 2.7 KiB — 129 ms — http/1.1https://www.nspvk.sk/theme/Flat-svg-arsenic/js/jquery-1.10.2.min.js/theme/Flat-svg-arsenic/js/jquery-1... https://www.nspvk.sk/theme/Flat-svg-arsenic/js/jquery-1.10.2.min.js — 200 — 32.5 KiB — 257 ms — http/1.1https://www.nspvk.sk/theme/Flat-svg-arsenic/js/migrate.js/theme/Flat-svg-arsenic/js/migrate.... https://www.nspvk.sk/theme/Flat-svg-arsenic/js/migrate.js — 200 — 785 B — 220 ms — http/1.1https://www.nspvk.sk/theme/Flat-svg-arsenic/css/responsive.css/theme/Flat-svg-arsenic/css/respons... https://www.nspvk.sk/theme/Flat-svg-arsenic/css/responsive.css — 200 — 1.9 KiB — 133 ms — http/1.1https://www.nspvk.sk/theme/Flat-svg-arsenic/images/logo_vector.png/theme/Flat-svg-arsenic/images/logo... https://www.nspvk.sk/theme/Flat-svg-arsenic/images/logo_vector.png — 200 — 853.8 KiB — 671 ms — http/1.1https://www.nspvk.sk/theme/Flat-svg-arsenic/images/slider.png/theme/Flat-svg-arsenic/images/slid... https://www.nspvk.sk/theme/Flat-svg-arsenic/images/slider.png — 200 — 211.8 KiB — 239 ms — http/1.1https://www.nspvk.sk/theme/Flat-svg-arsenic/css/reset.css/theme/Flat-svg-arsenic/css/reset.c... https://www.nspvk.sk/theme/Flat-svg-arsenic/css/reset.css — 200 — 1.2 KiB — 44 ms — http/1.1https://www.nspvk.sk/theme/Flat-svg-arsenic/css/layout.css/theme/Flat-svg-arsenic/css/layout.... https://www.nspvk.sk/theme/Flat-svg-arsenic/css/layout.css — 200 — 1.2 KiB — 42 ms — http/1.1https://www.nspvk.sk/theme/Flat-svg-arsenic/css/color.css/theme/Flat-svg-arsenic/css/color.c... https://www.nspvk.sk/theme/Flat-svg-arsenic/css/color.css — 200 — 2.5 KiB — 44 ms — http/1.1https://www.nspvk.sk/theme/Flat-svg-arsenic/js/custom.js/theme/Flat-svg-arsenic/js/custom.j... https://www.nspvk.sk/theme/Flat-svg-arsenic/js/custom.js — 200 — 781 B — 43 ms — http/1.1https://www.nspvk.sk/theme/Flat-svg-arsenic/js/jquery.mobilemenu.js/theme/Flat-svg-arsenic/js/jquery.m... https://www.nspvk.sk/theme/Flat-svg-arsenic/js/jquery.mobilemenu.js — 200 — 1.3 KiB — 44 ms — http/1.1data:image/svg+xml;base64,PHN2ZyB4bWxucz0naHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmcnIHhtbG5zOnhsaW5rPSdod…data:image/svg+xml;base64,PHN2ZyB4b... data:image/svg+xml;base64,PHN2ZyB4bWxucz0naHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmcnIHhtbG5zOnhsaW5rPSdod… — 200 — 0 B — 0 ms — datahttps://www.nspvk.sk/favicon.ico/favicon.ico https://www.nspvk.sk/favicon.ico — 200 — 1.2 KiB — 44 ms — http/1.1https://www.nspvk.sk/favicon.ico/favicon.ico https://www.nspvk.sk/favicon.ico — 200 — 0 B — 1 ms — http/1.1https://www.nspvk.sk/theme/Flat-svg-arsenic/images/sliders/slider1.png/theme/Flat-svg-arsenic/images/slid... https://www.nspvk.sk/theme/Flat-svg-arsenic/images/sliders/slider1.png — 200 — 195.1 KiB — 163 ms — http/1.1
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 (2026-09-23 — 2026-10-20)

LCP (p75)

1092 ms

95% good

INP (p75)

69 ms

98% good

CLS (p75)

0.000

100% good

FCP (p75)

1083 ms

TTFB (p75)

399 ms

This origin passes Core Web Vitals assessment
Image Optimization
2 images, 853 KB total, 817 KB wasted
INFO

Image Optimization Audit

Total Images

2

Total Size

853 KB

Oversized

1

Wasted

817 KB

2 missing dimensions
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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