https://www.donsp.sk
Performance
· 28 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
89
GRADE
B
FIX
1
REVIEW
8
PASS
14
INFO
5
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
52
91
96
92
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.47 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
5.95 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
140 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.593
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
4.00 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.
6.26 s
Page Load Progression
552 ms 1.1 s
1.7 s
2.2 s 2.8 s 3.3 s 3.9 s
4.4 sChecks
2814 PASS 8 REVIEW 1 FIX
DJS Execution CostAction2335ms total JS executionFIX
JS Execution Cost
Action2335ms total JS execution
2335ms total JS execution
Warning::
https://www.donsp.sk/donsp/: 687ms CPU time
Warning::
https://www.donsp.sk/donsp/wp-content/plugins/post...: 579ms CPU time
Warning::
Unattributable: 370ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=GT-577...: 277ms CPU time
Warning::
https://www.donsp.sk/donsp/wp-includes/js/jquery/j...: 272ms CPU time
Info::
Third-party scripts: 277ms (12% of total)
Main Thread Breakdown
Script Evaluation 33% Other 31% Style & Layout 19% Parse HTML & CSS 6% Script Parsing & Compilation 6% Rendering 4%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.donsp.sk/donsp/ | 687ms | 76ms | 25ms | 1st |
| https://www.donsp.sk/donsp/wp-content/plugins/post-carousel/public/assets/js/swiper-bundle.min.js?ver=4.0.8 | 579ms | 154ms | 11ms | 1st |
| Unattributable | 370ms | 7ms | 0ms | 1st |
| https://www.googletagmanager.com/gtag/js?id=GT-5773WXF9 | 277ms | 230ms | 44ms | 3rd |
| https://www.donsp.sk/donsp/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 | 272ms | 161ms | 11ms | 1st |
| https://www.donsp.sk/donsp/wp-content/plugins/ml-slider/assets/sliders/nivoslider/jquery.nivo.slider.pack.js?ver=3.113.0 | 80ms | 42ms | 3ms | 1st |
| https://www.donsp.sk/donsp/wp-content/plugins/complianz-gdpr/cookiebanner/js/complianz.min.js?ver=1789706654 | 70ms | 51ms | 5ms | 1st |
BImage Optimization24 images, 0 KB saveableREVIEW
Image Optimization
24 images, 0 KB saveable
24 images, 0 KB saveable
Warning::
https://www.donsp.sk/donsp/wp-content/uploads/crop... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
24 images 373 KB
0 oversized -0 KB
9 legacy format
1 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
BJS Bundles23 scripts, 132 KB unusedREVIEW
JS Bundles
23 scripts, 132 KB unused
23 scripts, 132 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=GT-577...: 72 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.donsp.sk/donsp/wp-content/plugins/simp...: 36 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.donsp.sk/donsp/wp-content/plugins/post...: 24 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 132 KB
132 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=GT-5773WXF9 | 177 KB | 72 KB (41%) | ✓ | 3rd |
| https://www.donsp.sk/donsp/wp-content/plugins/simply-gallery-block/plugins/pgc_sgb_lightbox.min.js?ver=3.4.2 | 48 KB | 36 KB (75%) | ✓ | 1st |
| https://www.donsp.sk/donsp/wp-content/plugins/post-carousel/public/assets/js/swiper-bundle.min.js?ver=4.0.8 | 42 KB | 24 KB (58%) | ✓ | 1st |
| https://www.donsp.sk/donsp/wp-content/cache/wpo-minify/1789706700/assets/wpo-minify-footer-contact-form-71789706656.min.js | 5 KB | — | ✓ | 1st |
| https://www.donsp.sk/donsp/wp-content/themes/izo/assets/js/functions.min.js?ver=1.0.12 | 1 KB | — | ✓ | 1st |
| https://www.donsp.sk/donsp/wp-content/plugins/ml-slider/assets/sliders/nivoslider/jquery.nivo.slider.pack.js?ver=3.113.0 | 3 KB | — | ✓ | 1st |
| https://www.donsp.sk/donsp/wp-includes/js/dist/hooks.min.js?ver=f0f188028580e8dc1255 | 2 KB | — | ✓ | 1st |
| https://www.donsp.sk/donsp/wp-content/cache/wpo-minify/1789706700/assets/wpo-minify-footer-wppopups1789706683.min.js | 7 KB | — | ✓ | 1st |
| https://www.donsp.sk/donsp/wp-includes/js/dist/i18n.min.js?ver=1dfe7db3940c23ea9216 | 2 KB | — | ✓ | 1st |
| https://www.donsp.sk/donsp/wp-content/cache/wpo-minify/1789706700/assets/wpo-minify-footer-swv1789706656.min.js | 3 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
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
HTTP/3 (QUIC)
HTTP/3 not advertised
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.
CDocument CompressionActionDocument response served uncompressedREVIEW
Document Compression
ActionDocument response served uncompressed
Document response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
Server-Timing Observability
No Server-Timing header found
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.
BCSS Performance Depth2 CSS depth issue(s) detectedREVIEW
CSS Performance Depth
2 CSS depth issue(s) detected
2 CSS depth issue(s) detected
Warning::
6 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.
Warning::
1 `@font-face` rule(s) without `font-display` -- causes FOIT
An `@font-face` rule without `font-display` causes Flash of Invisible Text (FOIT): the browser hides the styled text for up to 3 seconds while the custom font downloads, then either swaps to fallback (Chrome / Firefox) or stays invisible (older Safari). Add `font-display: swap` (shows fallback immediately, swaps in the custom font when ready) or `font-display: optional` (uses fallback if the font isn't ready in 100ms; never causes visible swap). Either eliminates FOIT outright.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
BHTTP Cachingno-cacheREVIEW
HTTP Caching
no-cache
no-cache
Info::
Cache-Control header is set
Got: no-cache
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
no-cache
| Directive | Value | Meaning |
|---|---|---|
| no-cache | — | Cache but always revalidate first |
APage Weight Budget941 KB transferred, 58 requestsPASS
Page Weight Budget
941 KB transferred, 58 requests
941 KB transferred, 58 requests
Info::
Page weighs 2.1 MB (941 KB transferred)
Info::
58 HTTP requests
Info::
Estimated 0.19 g CO2 per page load
941 KB transferred
58 requests
0.19 g CO2 per page load
JavaScript 378.3 KiB 40%
Images 372.9 KiB 40%
CSS 78.7 KiB 8%
Fonts 75.4 KiB 8%
HTML 34.2 KiB 4%
Other 589 B 0%
Other 546 B 0%
0 2.4 MB 4.9 MB
Under budget
A+Third-Party Impact19% third-party, 0 ms blockingPASS
Third-Party Impact
19% third-party, 0 ms blocking
19% third-party, 0 ms blocking
Info::
Third-party code accounts for 19% of page weight (177.4 KiB of 940.7 KiB)
Info::
Third-party blocking time is low (0 ms)
81%
19%
First-party Third-party
A+Text CompressionAll text resources are compressedPASS
Text Compression
All text resources are compressed
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+Font Loading1 fonts (75 KB)PASS
Font Loading
1 fonts (75 KB)
1 fonts (75 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
1
75 KB total
Render-blocking
0
of 1
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
fontawesome-webfont.woff2 woff2 swap
Size 75 KB
Load time 58 ms
Start 1.2 s
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 CachingAll resources properly cachedPASS
Resource Caching
All resources properly cached
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+Critical Rendering PathNo render-blocking resourcesPASS
Critical Rendering Path
No render-blocking resources
No render-blocking resources
Info::
No render-blocking resources detected
A+Resource Hints1 hints, 0 missing preconnectsPASS
Resource Hints
1 hints, 0 missing preconnects
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)
Current Resource Hints
preconnect—
preload—
dns-prefetch 1
prefetch—
1 resource hints configured
A+LCP Image PreloadLCP preload audit not availablePASS
LCP Image Preload
LCP preload audit not available
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+Main HTML Cache-ControlMain HTML uses no-cache -- safe revalidate-on-request policyPASS
Main HTML Cache-Control
Main HTML uses no-cache -- safe revalidate-on-request policy
Main HTML uses no-cache -- safe revalidate-on-request policy
Info::
Main HTML uses no-cache -- safe revalidate-on-request policy
Got: no-cache
A+Server Response Intelligence1 server-response signal(s) detectedPASS
Server Response Intelligence
1 server-response signal(s) detected
1 server-response signal(s) detected
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+Page Weight Inventory58 resources · 941 KB · 132 KB savings availablePASS
Page Weight Inventory
58 resources · 941 KB · 132 KB savings available
58 resources · 941 KB · 132 KB savings available
Info::
Within 1MB page-weight target
Got: 941 KB
Info::
~132 KB of savings available
Info::
2 third-party resources (19% of weight)
58 resources · 940.7 KiB · 2 third-party Within 1MB page-weight target
JavaScript 40% · 378.3 KiB
Image 40% · 373.4 KiB
CSS 8% · 78.7 KiB
Font 8% · 75.4 KiB
Document 4% · 34.3 KiB
Other 0% · 546 B
~132.3 KiB of savings available
Remove unused JavaScript: 132.3 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 58 resources | 940.7 KiB | ||||||
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
Render-Blocking Resources
No render-blocking resources detected
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+Third-Party ResourcesNo third-party resources detectedPASS
Third-Party Resources
No third-party resources detected
No third-party resources detected
A+JavaScript BlockingNo render-blocking JS or document.write usage detectedPASS
JavaScript Blocking
No render-blocking JS or document.write usage detected
No render-blocking JS or document.write usage detected
Info::
No JavaScript blocking issues detected
Asset CompressionNo text asset hosts to measureINFO
Asset Compression
No text asset hosts to measure
No text asset hosts to measure
Info::
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall58 requests over 2114msINFO
Network Waterfall
58 requests over 2114ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
12% of JavaScript execution is third-party
First-party Third-party 277ms · 177KB · €4/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Google Tag Manager www.googletagmanager.com | Tag Manager | 277ms | 177 KB | 41% | €4/mo | Costly |
Google Tag Manager
Tag Manager
Execution 277ms
Transfer 177 KB
Unused 41%
Monthly Cost €4/mo
These scripts may cost more than they're worth
- Google Tag Manager adds 277ms and costs ~€4/month
Google Tag Manager takes 277ms 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
Real-User Performance (CrUX)Field metrics from the Chrome User Experience ReportINFO
Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
Chrome User Experience (CrUX)
Real-user metrics from the Chrome UX Report (2026-09-23 — 2026-10-20)
LCP (p75)
1115 ms
96% good
INP (p75)
84 ms
97% good
CLS (p75)
0.000
94% good
FCP (p75)
1002 ms
TTFB (p75)
455 ms
This origin passes Core Web Vitals assessment
Image Optimization34 images, 2184 KB total, 0 KB wastedINFO
Image Optimization
34 images, 2184 KB total, 0 KB wasted
Image Optimization Audit
Total Images
34
Total Size
2184 KB
17 missing dimensions 1 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.