https://www.donsp.sk
Performance
· 24 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
89
GRADE
B
FIX
0
REVIEW
8
PASS
11
INFO
5
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
95
95
96
92
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
445 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
974 ms
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.
0.101
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.35 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.
979 ms
Page Load Progression
546 ms 1.1 s
1.6 s 2.2 s 2.7 s 3.3 s
3.8 s
4.4 sChecks
2411 PASS 8 REVIEW
BImage Optimization23 images, 0 KB saveableREVIEW
Image Optimization
23 images, 0 KB saveable
23 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.
23 images 319 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 Execution Cost554ms total JS executionREVIEW
JS Execution Cost
554ms total JS execution
554ms total JS execution
Info::
https://www.donsp.sk/donsp/: 184ms CPU time
Info::
https://www.donsp.sk/donsp/wp-content/plugins/post...: 153ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=GT-577...: 73ms CPU time
Info::
Unattributable: 73ms CPU time
Info::
https://www.donsp.sk/donsp/wp-includes/js/jquery/j...: 71ms CPU time
Info::
Third-party scripts: 73ms (13% of total)
Main Thread Breakdown
Script Evaluation 35% Other 29% Style & Layout 21% Rendering 5% Script Parsing & Compilation 5% Parse HTML & CSS 5%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.donsp.sk/donsp/ | 184ms | 22ms | 2ms | 1st |
| https://www.donsp.sk/donsp/wp-content/plugins/post-carousel/public/assets/js/swiper-bundle.min.js?ver=4.0.8 | 153ms | 40ms | 3ms | 1st |
| https://www.googletagmanager.com/gtag/js?id=GT-5773WXF9 | 73ms | 62ms | 10ms | 3rd |
| Unattributable | 73ms | 2ms | 0ms | 1st |
| https://www.donsp.sk/donsp/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 | 71ms | 42ms | 2ms | 1st |
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.
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 Budget918 KB transferred, 58 requestsPASS
Page Weight Budget
918 KB transferred, 58 requests
918 KB transferred, 58 requests
Info::
Page weighs 2.0 MB (918 KB transferred)
Info::
58 HTTP requests
Info::
Estimated 0.19 g CO2 per page load
918 KB transferred
58 requests
0.19 g CO2 per page load
JavaScript 378.3 KiB 41%
Images 319.1 KiB 35%
Fonts 106.4 KiB 12%
CSS 78.7 KiB 9%
HTML 34.2 KiB 4%
Other 612 B 0%
Other 546 B 0%
0 2.4 MB 4.9 MB
Under budget
AThird-Party Impact23% third-party, 0 ms blockingPASS
Third-Party Impact
23% third-party, 0 ms blocking
23% third-party, 0 ms blocking
Info::
Third-party code accounts for 23% of page weight (208.4 KiB of 917.8 KiB)
Info::
Third-party blocking time is low (0 ms)
77%
23%
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 Loading2 fonts (106 KB)PASS
Font Loading
2 fonts (106 KB)
2 fonts (106 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
2
106 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
x-font-woff;charset=utf... woff swap
Size 31 KB
Load time 65 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
- Convert to woff2 for ~30% smaller file size
fontawesome-webfont.woff2 woff2 swap
Size 75 KB
Load time 50 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)
Fixing the unchecked items could save ~9 KB and ~18 ms
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 HintsNo optimization neededPASS
Resource Hints
No optimization needed
No optimization needed
Info::
No resource hint issues
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 · 918 KB · 132 KB savings availablePASS
Page Weight Inventory
58 resources · 918 KB · 132 KB savings available
58 resources · 918 KB · 132 KB savings available
Info::
Within 1MB page-weight target
Got: 918 KB
Info::
~132 KB of savings available
Info::
3 third-party resources (23% of weight)
58 resources · 917.8 KiB · 3 third-party Within 1MB page-weight target
JavaScript 41% · 378.3 KiB
Image 35% · 319.6 KiB
Font 12% · 106.4 KiB
CSS 9% · 78.7 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 | 917.8 KiB | ||||||
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 2050msINFO
Network Waterfall
58 requests over 2050ms
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
13% of JavaScript execution is third-party
First-party Third-party 73ms · 177KB · €1/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Google Tag Manager www.googletagmanager.com | Tag Manager | 73ms | 177 KB | 41% | €1/mo | Optional |
Google Tag Manager
Tag Manager
Execution 73ms
Transfer 177 KB
Unused 41%
Monthly Cost €1/mo
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.