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zing.vn Desktop Performance
39/100
These metrics represent real-world Chrome users experience viewing zing.vn 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
First Input Delay
Largest Contentful Paint
Cumulative Layout Shift
First Contentful Paint
Metrics
Total Blocking Time8/100 900 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Time to Interactive10/100 8.2 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Speed Index11/100 3.9 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Largest Contentful Paint66/100 1.9 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
First Contentful Paint83/100 1.1 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Cumulative Layout Shift100/100 0
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (20)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Properly size images
Potential savings of 4,250 KiB
3,980 ms
Defer offscreen images
Potential savings of 4,222 KiB
3,820 ms
Serve images in next-gen formats
Potential savings of 3,310 KiB
2,850 ms
Efficiently encode images
Potential savings of 1,006 KiB
870 ms
Remove unused JavaScript
Potential savings of 522 KiB
640 ms
Reduce initial server response time
Root document took 1,210 ms
608 ms
Eliminate render-blocking resources
Potential savings of 200 ms
200 ms
Remove unused CSS
Potential savings of 44 KiB
80 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Avoid `document.write()`
Ensure text remains visible during webfont load
Avoid an excessive DOM size
5,655 elements
Avoid enormous network payloads
Total size was 8,205 KiB
Serve static assets with an efficient cache policy
122 resources found
Minimize main-thread work
6.4 s
Reduce JavaScript execution time
2.0 s
Largest Contentful Paint element
1 element found
Avoid long main-thread tasks
12 long tasks found
Avoid large layout shifts
5 elements found
Avoid chaining critical requests
15 chains found
Keep request counts low and transfer sizes small
270 requests • 8,205 KiB
Passed Audits (9)
Preconnect to required origins
Minify CSS
Minimize third-party usage
Third-party code blocked the main thread for 110 ms
Enable text compression
Potential savings of 3 KiB
Use video formats for animated content
Uses passive listeners to improve scrolling performance
Preload key requests
Avoid multiple page redirects
Potential savings of 190 ms
Minify JavaScript
zing.vn Desktop SEO
92/100
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.
Image elements do not have `[alt]` attributes
Passed Audits (11)
Document has a `<title>` element
robots.txt is valid
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Links are crawlable
Document has a meta description
Page has successful HTTP status code
Links have descriptive text
Document has a valid `hreflang`
Document has a valid `rel=canonical`
Page isn’t blocked from indexing
Document avoids plugins
zing.vn Desktop Best Practices
85/100
These checks highlight opportunities to improve the overall code health of zing.vn 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 (2)
General
Browser errors were logged to the console
Trust and Safety
Does not use HTTPS
1 insecure request found
Passed Audits (12)
Detected JavaScript libraries
Avoids front-end JavaScript libraries with known security vulnerabilities
Serves images with appropriate resolution
Avoids Application Cache
Links to cross-origin destinations are safe
Page has the HTML doctype
Displays images with correct aspect ratio
Avoids requesting the geolocation permission on page load
Avoids requesting the notification permission on page load
Allows users to paste into password fields
Avoids deprecated APIs
Properly defines charset
zing.vn Desktop Progressive Web App
22/100
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 (9)
PWA Optimized
Manifest doesn't have a maskable icon
Is not configured for a custom splash screen
Does not set a theme color for the address bar.
Fast and reliable
Page load is not fast enough on mobile networks
Interactive on simulated mobile network at 39.3 s
Current page does not respond with a 200 when offline
`start_url` does not respond with a 200 when offline
Installable
Does not use HTTPS
1 insecure request found
Web app manifest does not meet the installability requirements
Does not register a service worker that controls page and `start_url`
Passed Audits (4)
Contains some content when JavaScript is not available
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Redirects HTTP traffic to HTTPS
Provides a valid `apple-touch-icon`
zing.vn Desktop Accessibility
40/100
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 (9)
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.
Buttons do not have an accessible name
Links do not have a discernible name
`<object>` elements do not have `[alt]` text
Image elements do not have `[alt]` attributes
`<frame>` or `<iframe>` elements do not have a title
Navigation
These are opportunities to improve keyboard navigation in your application.
Some elements have a `[tabindex]` value greater than 0
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.
Best practices
These items highlight common accessibility best practices.
`[user-scalable="no"]` is used in the `<meta name="viewport">` element or the `[maximum-scale]` attribute is less than 5.
Passed Audits (8)
Document has a `<title>` element
The page contains a heading, skip link, or landmark region
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
`<html>` element has a valid value for its `[lang]` attribute
`[id]` attributes on active, focusable elements are unique
`<html>` element has a `[lang]` attribute
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`[aria-hidden="true"]` is not present on the document `<body>`
Desktop Speed
53/100
These checks analyze the performance of zing.vn 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 (4)
Optimize images
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Leverage browser caching
Minify JavaScript
Passed Audits (6)
Avoid landing page redirects
Enable compression
Reduce server response time
Minify CSS
Minify HTML
Prioritize visible content
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