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vtv.vn Mobile Performance
38/100
These metrics represent real-world Chrome users experience viewing vtv.vn on mobile devices. 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 Contentful Paint
Largest Contentful Paint
Cumulative Layout Shift
First Input Delay
Metrics
Largest Contentful Paint2/100 8.7 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Total Blocking Time14/100 1,120 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Speed Index43/100 6.2 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Time to Interactive61/100 6.3 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
First Contentful Paint92/100 2.2 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Cumulative Layout Shift93/100 0.089
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (21)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Properly size images
Potential savings of 2,087 KiB
10,800 ms
Serve images in next-gen formats
Potential savings of 1,787 KiB
9,180 ms
Efficiently encode images
Potential savings of 243 KiB
1,200 ms
Remove unused JavaScript
Potential savings of 120 KiB
750 ms
Eliminate render-blocking resources
Potential savings of 730 ms
730 ms
Reduce initial server response time
Root document took 1,080 ms
482 ms
Use video formats for animated content
Potential savings of 93 KiB
420 ms
Remove unused CSS
Potential savings of 32 KiB
150 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Does not use passive listeners to improve scrolling performance
Ensure text remains visible during webfont load
Avoid `document.write()`
Minimize main-thread work
8.9 s
Avoid enormous network payloads
Total size was 4,678 KiB
Reduce JavaScript execution time
3.2 s
Avoid an excessive DOM size
886 elements
Serve static assets with an efficient cache policy
17 resources found
Largest Contentful Paint element
1 element found
Avoid chaining critical requests
5 chains found
Keep request counts low and transfer sizes small
120 requests • 4,678 KiB
Avoid long main-thread tasks
19 long tasks found
Avoid large layout shifts
5 elements found
Passed Audits (8)
Minify CSS
Defer offscreen images
Preconnect to required origins
Minimize third-party usage
Third-party code blocked the main thread for 190 ms
Minify JavaScript
Preload key requests
Avoid multiple page redirects
Potential savings of 630 ms
Enable text compression
Potential savings of 5 KiB
vtv.vn Mobile SEO
83/100
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 (3)
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
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Links are not crawlable
Mobile Friendly
Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. Learn more.
Tap targets are not sized appropriately
73% appropriately sized tap targets
Passed Audits (11)
Document has a meta description
Page isn’t blocked from indexing
Page has successful HTTP status code
Document uses legible font sizes
92.27% legible text
robots.txt is valid
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Document avoids plugins
Document has a valid `hreflang`
Links have descriptive text
Document has a valid `rel=canonical`
Document has a `<title>` element
vtv.vn Mobile Best Practices
69/100
These checks highlight opportunities to improve the overall code health of vtv.vn mobile 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 (4)
User Experience
Serves images with low resolution
Trust and Safety
Links to cross-origin destinations are unsafe
Includes front-end JavaScript libraries with known security vulnerabilities
6 vulnerabilities detected
Does not use HTTPS
1 insecure request found
Passed Audits (10)
Avoids deprecated APIs
Detected JavaScript libraries
Displays images with correct aspect ratio
No browser errors logged to the console
Avoids requesting the notification permission on page load
Properly defines charset
Page has the HTML doctype
Avoids Application Cache
Avoids requesting the geolocation permission on page load
Allows users to paste into password fields
vtv.vn Mobile Progressive Web App
50/100
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)
PWA Optimized
Is not configured for a custom splash screen
Does not set a theme color for the address bar.
Manifest doesn't have a maskable icon
Fast and reliable
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 (6)
Page load is fast enough on mobile networks
Contains some content when JavaScript is not available
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Redirects HTTP traffic to HTTPS
Content is sized correctly for the viewport
Provides a valid `apple-touch-icon`
vtv.vn Mobile Accessibility
56/100
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)
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
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.
Image elements do not have `[alt]` attributes
Links do not have a discernible name
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 (9)
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
`[aria-hidden="true"]` is not present on the document `<body>`
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`<html>` element has a `[lang]` attribute
The page contains a heading, skip link, or landmark region
`[id]` attributes on active, focusable elements are unique
`<html>` element has a valid value for its `[lang]` attribute
Heading elements appear in a sequentially-descending order
Document has a `<title>` element
Mobile Usability
99/100
These checks validate how easily a visitor can use vtv.vn on a mobile device. Test results include a list of any mobile usability problems. Mobile usability problems are issues that can affect a user that visits the page on a mobile (small screen) device, including small font sizes (which are hard to read on a small screen).
Should Fix (1)
Size tap targets appropriately
Passed Audits (4)
Avoid plugins
Configure the viewport
Size content to viewport
Use legible font sizes
Mobile Speed
65/100
These checks analyze the performance of vtv.vn on mobile 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
Enable compression
Passed Audits (6)
Avoid landing page redirects
Reduce server response time
Minify CSS
Minify HTML
Minify JavaScript
Prioritize visible content
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