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https://www.nspvk.sk

Performance

· 23 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
90
GRADE
A
FIX
1
REVIEW
8
PASS
11
INFO
3

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

Mobile Desktop
98
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
80
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.

772 ms

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

1.01 s

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

0 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.

804 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.

1.01 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
23
11 PASS 8 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
1.2 MB transferred, 29 requests
REVIEW
1.2 MB transferred, 29 requests
Info::
Page weighs 1.6 MB (1.2 MB transferred)
Warning::
Images are 1.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.0 MB
Info::
29 HTTP requests
Info::
Estimated 0.26 g CO2 per page load
1.2 MB / 2.4 MB budget
1.2 MB transferred
29 requests
0.26 g CO2 per page load
Images 1.0 MiB 85%
JavaScript 161.0 KiB 13%
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.
B
Page Weight Inventory
29 resources · 1.2 MB · 76 KB savings available
REVIEW
29 resources · 1.2 MB · 76 KB savings available
Warning::
Page weight 1.2 MB exceeds 1 MB target by 232 KB
Got: 1.2 MB Expected: ≤ 1 MB
Info::
~76 KB of savings available
Info::
3 third-party resources (2% of weight)
Info::
2 resources over 200KB
29 resources · 1.2 MiB · 3 third-party 232.5 KiB over 1MB target
Image 85% · 1.0 MiB
JavaScript 13% · 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
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 1.2 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
3 images, 0 KB saveable
PASS
3 images, 0 KB saveable
Info::
All images are well-optimized
3 images 1.0 MB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
No JS execution data
PASS
No JS execution data
Info::
No significant JS execution detected

Main Thread Breakdown

Other 37% Script Evaluation 24% Style & Layout 23% Script Parsing & Compilation 8% Parse HTML & CSS 5%
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.
Network Waterfall
29 requests over 1228ms
INFO
0 ms 500 ms 1.0 s FCP 772 ms LCP 1.0 shttps://www.nspvk.sk// https://www.nspvk.sk/ — 200 — 4.4 KiB — 257 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 — 48 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 — 49 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 — 99 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 — 100 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 — 77 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 — 255 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 — 181 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 — 185 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 — 224 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 — 188 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 — 188 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 — 314 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 — 74 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 — 228 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 — 140 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 — 279 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 — 230 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 — 140 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 — 676 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 — 280 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 — 46 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 — 45 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 — 45 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 — 46 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/1.1
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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