Cnb.cz Česká národní banka - Česká národní banka
cnb.cz Desktop Performance
80/100
These metrics represent real-world Chrome users experience viewing cnb.cz web page. Reports are focused on loading performance and other critical factors that most affect user experience. Follow our guide to track, optimize, and improve the quality of your web pages.
User Loading Experience
Largest Contentful Paint
Cumulative Layout Shift
First Input Delay
First Contentful Paint
Metrics
Cumulative Layout Shift44/100 0.278
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Largest Contentful Paint49/100 2.4 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
First Contentful Paint86/100 1.0 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Speed Index87/100 1.4 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Time to Interactive98/100 1.7 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Total Blocking Time100/100 0 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Should Fix (17)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Avoid multiple page redirects
Potential savings of 680 ms
680 ms
Enable text compression
Potential savings of 447 KiB
480 ms
Use video formats for animated content
Potential savings of 584 KiB
480 ms
Properly size images
Potential savings of 432 KiB
320 ms
Serve images in next-gen formats
Potential savings of 415 KiB
280 ms
Remove unused CSS
Potential savings of 144 KiB
200 ms
Efficiently encode images
Potential savings of 243 KiB
200 ms
Remove unused JavaScript
Potential savings of 281 KiB
200 ms
Eliminate render-blocking resources
Potential savings of 120 ms
116 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Ensure text remains visible during webfont load
Serve static assets with an efficient cache policy
40 resources found
Avoid an excessive DOM size
883 elements
Avoid chaining critical requests
6 chains found
Largest Contentful Paint element
1 element found
Keep request counts low and transfer sizes small
57 requests • 2,324 KiB
Avoid long main-thread tasks
1 long task found
Avoid large layout shifts
5 elements found
Passed Audits (12)
Minify CSS
JavaScript execution time
0.1 s
Minimize third-party usage
Third-party code blocked the main thread for 0 ms
Preconnect to required origins
Minimizes main-thread work
0.4 s
Avoids `document.write()`
Avoids enormous network payloads
Total size was 2,324 KiB
Uses passive listeners to improve scrolling performance
Defer offscreen images
Preload key requests
Initial server response time was short
Root document took 300 ms
Minify JavaScript
cnb.cz Desktop SEO
91/100
These checks ensure that your page is optimized for search engine results ranking. There are additional factors Lighthouse does not check that may affect your search ranking. Learn more. Run these additional validators on your site to check additional SEO best practices.
Should Fix (1)
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Document does not have a meta description
Passed Audits (10)
Links are crawlable
Document has a `<title>` element
Page has successful HTTP status code
Document has a valid `hreflang`
Document avoids plugins
Image elements have `[alt]` attributes
robots.txt is valid
Page isn’t blocked from indexing
Links have descriptive text
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
cnb.cz Desktop Best Practices
77/100
These checks highlight opportunities to improve the overall code health of cnb.cz page. Current recommendations will help to make your page fast and secure, to create a good user experience and to avoid deprecated technologies.
Should Fix (3)
Trust and Safety
Includes front-end JavaScript libraries with known security vulnerabilities
8 vulnerabilities detected
Does not use HTTPS
2 insecure requests found
Links to cross-origin destinations are unsafe
Passed Audits (11)
Avoids Application Cache
Detected JavaScript libraries
Properly defines charset
Serves images with appropriate resolution
Avoids requesting the notification permission on page load
No browser errors logged to the console
Allows users to paste into password fields
Avoids deprecated APIs
Avoids requesting the geolocation permission on page load
Page has the HTML doctype
Displays images with correct aspect ratio
cnb.cz Desktop Progressive Web App
48/100
These checks validate the aspects of a Progressive Web App. Learn more. These checks are required by the baseline PWA Checklist but are not automatically checked by Lighthouse. They do not affect your score but it's important that you verify them manually.
Should Fix (8)
Installable
Does not use HTTPS
2 insecure requests found
Web app manifest does not meet the installability requirements
Does not register a service worker that controls page and `start_url`
PWA Optimized
Does not set a theme color for the address bar.
Manifest doesn't have a maskable icon
Is not configured for a custom splash screen
Fast and reliable
Current page does not respond with a 200 when offline
`start_url` does not respond with a 200 when offline
Passed Audits (5)
Contains some content when JavaScript is not available
Page load is fast enough on mobile networks
Provides a valid `apple-touch-icon`
Redirects HTTP traffic to HTTPS
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
cnb.cz Desktop Accessibility
85/100
These checks highlight opportunities to improve the accessibility of your web app. Only a subset of accessibility issues can be automatically detected so manual testing is also encouraged. These items address areas which an automated testing tool cannot cover. Learn more in our guide on conducting an accessibility review.
Should Fix (4)
Names and labels
These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.
Form elements do not have associated labels
Links do not have a discernible name
Navigation
These are opportunities to improve keyboard navigation in your application.
Heading elements are not in a sequentially-descending order
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
Passed Audits (15)
`<html>` element has a `[lang]` attribute
Document has a `<title>` element
ARIA IDs are unique
`[id]` attributes on active, focusable elements are unique
The page contains a heading, skip link, or landmark region
Image elements have `[alt]` attributes
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
`[aria-*]` attributes match their roles
Buttons have an accessible name
`[aria-*]` attributes are valid and not misspelled
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
`[aria-*]` attributes have valid values
`[aria-hidden="true"]` is not present on the document `<body>`
`<html>` element has a valid value for its `[lang]` attribute
Desktop Speed
46/100
These checks analyze the performance of cnb.cz on desktop devices and return PageSpeed score and information on how to improve the load time. What makes a good Progressive Web App?
Should Fix (7)
Enable compression
Optimize images
Leverage browser caching
Avoid landing page redirects
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Prioritize visible content
Minify HTML
Passed Audits (3)
Reduce server response time
Minify CSS
Minify JavaScript
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