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farlesk.sk

Skenované 13. júna 2026

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jQuery 3.7.1
Bootstrap 5.3.8
Font Awesome
Swiper
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Posledný sken: 13. júna 2026
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Výkon

Váha: 25% · 5 prešlo · 7 upozornenia · 7 zlyhalo

Čo sme zistili: 8.46s (good: <1.8s)

Prečo na tom záleží: FCP over 3s means users stare at a blank screen for 3+ seconds. 53% of mobile users abandon sites that take over 3 seconds to show content.

Ako to opraviť: Critical: enable full-page caching, eliminate render-blocking resources, preload critical CSS, defer all non-essential JS, and compress images.

Čo sme zistili: 16.14s (good: <2.5s) — Core Web Vital FAILING

Prečo na tom záleží: LCP >4s fails Core Web Vitals — Google actively demotes these pages. Each 100ms improvement in LCP correlates with 1.7% higher conversion rate (Vodafone study).

Ako to opraviť: Urgent: your largest content element loads too slowly. 1) Preload hero image, 2) Convert to WebP/AVIF, 3) Serve from CDN, 4) Remove render-blocking JS before it, 5) Consider lazy loading all other images.

Čo sme zistili: 2316ms (good: <200ms)

Prečo na tom záleží: TBT over 600ms means your page is unresponsive for over half a second. Users who can't interact within 100ms perceive the site as broken. This kills conversions.

Ako to opraviť: Critical: audit all JavaScript. 1) Remove unused plugins/modules, 2) Defer analytics and chat widgets, 3) Code-split large bundles, 4) Move heavy computation to web workers.

Čo sme zistili: 20.14s (good: <3.4s)

Prečo na tom záleží: Speed Index over 5.8s means users watch a near-blank page for almost 6 seconds. At this speed, you're losing 40%+ of potential customers to competitors.

Ako to opraviť: Your page loads very slowly visually. Prioritize critical rendering path: inline critical CSS, defer non-essential JS, preload hero image, and use a CDN.

Čo sme zistili: 12.5 MB, 290 requests — too heavy!

Prečo na tom záleží: Pages over 3 MB take 12+ seconds on 3G. The average e-commerce page is 2.2 MB — you're well above that. Amazon found every 100ms of latency costs 1% of sales.

Ako to opraviť: Critical: your page is over 3 MB. 1) Convert all images to WebP/AVIF, 2) Lazy load everything below the fold, 3) Remove unused plugins, 4) Combine and minify CSS/JS, 5) Enable brotli compression.

Čo sme zistili: 1967 KB wasted on unused code!

Prečo na tom záleží: Over 200 KB of unused code significantly slows parsing and execution. This is one of the easiest performance wins — removing dead code requires no trade-offs.

Poznámka: Táto kontrola používa heuristickú detekciu a môže vrátiť aj falošné pozitíva. Odporúčame manuálne overenie.

Ako to opraviť: You're loading 1967 KB of code that isn't used on this page. 1) Audit plugins and remove unused ones, 2) Use code-splitting for page-specific JS, 3) Run PurgeCSS on your stylesheets.

Čo sme zistili: 11 CSS files — too many!

Prečo na tom záleží: Each CSS file blocks rendering. With 11 files, the browser must download all of them before painting anything. This can add 1-2+ seconds on mobile networks.

Ako to opraviť: Bundle your CSS files into 1-3 files maximum. Use a build tool (Webpack, Vite, Gulp) to concatenate and minify. Critical CSS should be inlined, the rest deferred.

Čo sme zistili: 376 images without lazy loading

Prečo na tom záleží: Without lazy loading, ALL images download on page load — even those never scrolled to. On a product page with 20 images, lazy loading can save 80%+ of initial download.

Ako to opraviť: Add loading='lazy' to all images below the fold. Keep the hero/LCP image eager-loaded. Native lazy loading is supported by all modern browsers.

Prečo na tom záleží: Without cache headers, browsers use heuristic caching which is unpredictable. Explicit caching can eliminate 60%+ of requests for repeat visitors.

Ako to opraviť: Add Cache-Control headers: 'max-age=31536000, immutable' for versioned static assets, 'max-age=0, must-revalidate' for HTML.

Čo sme zistili: Only 60% of 5 scripts use async/defer

Prečo na tom záleží: Synchronous scripts block HTML parsing — the browser stops rendering until each script downloads and executes. Async/defer allows parallel downloading without blocking.

Ako to opraviť: Add 'defer' to scripts that don't need to run immediately, 'async' for independent scripts. Use type='module' for modern ES modules. Only critical inline scripts should be synchronous.

Čo sme zistili: Custom fonts detected without preload hints

Prečo na tom záleží: Fonts are discovered late in the render pipeline (after CSS is parsed). Preloading tells the browser to download them immediately, reducing Flash of Invisible Text (FOIT) by 200-500ms.

Ako to opraviť: Preload your primary font: <link rel='preload' href='/fonts/main.woff2' as='font' type='font/woff2' crossorigin>. For Google Fonts: preconnect to fonts.gstatic.com.

Čo sme zistili: 11 CSS files without critical CSS extraction

Prečo na tom záleží: Render-blocking CSS delays first paint. Inlining critical CSS eliminates the render-blocking round trip — the biggest FCP improvement for CSS-heavy sites.

Ako to opraviť: Extract critical above-the-fold CSS and inline it in <head>. Load remaining CSS asynchronously: <link rel='preload' href='styles.css' as='style' onload='this.rel="stylesheet"'>.

Čo sme zistili: 4 external domains without preconnect

Prečo na tom záleží: Third-party connections require DNS lookup, TCP handshake, and TLS negotiation. Preconnect performs these in parallel with HTML parsing, saving 100-300ms per origin.

Ako to opraviť: Add <link rel='preconnect'> for key third-party domains: www.googletagmanager.com, www.google.com, code.jquery.com. Preconnect saves 100-300ms per domain by starting DNS+TCP+TLS early.

Čo sme zistili: 2599 KB of inline JavaScript

Prečo na tom záleží: Large inline scripts cannot be cached separately — they're re-downloaded with every page load. Moving them to external files with defer enables HTTP caching and parallel downloads.

Ako to opraviť: Move large inline scripts to external files. Inline JS over 100 KB inflates HTML, prevents caching, and blocks the parser. External files can be cached, compressed, and deferred.

14 problémov v kategórii Výkon. Toto škodí vášmu e-shopu.

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