Skip to content
https://vnexpress.net

Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
SCORE
0
GRADE
FIX
0
REVIEW
0
PASS
0
INFO
0

Detailed Report

Audit breakdown by category with detailed findings.

14

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
la2.vnecdn.net/static/device_model_min.js900.0 s614.3 KiB
la4.vnecdn.net/static/device_model_min.js900.0 s614.2 KiB
octopus-stream01-cads.fpt.vn/cdp.js0.0 ms129.5 KiB
scdn.eclick.vn/delivery/dfp/prebid.js3600.0 s131.8 KiB
s1cdn.vnecdn.net/vnexpress/restruct/c/v3897/v2/fonts/Merriweather-Regular.woff0.0 ms83.5 KiB
s1cdn.vnecdn.net/vnexpress/restruct/c/v3897/v2/fonts/Merriweather-Bold.woff0.0 ms81.4 KiB
scdn.eclick.vn/delivery/dfp/ov_mb_vne_home_home.js3600.0 s36.7 KiB
scdn.eclick.vn/delivery/dfp/dfpbrand.js3600.0 s32.7 KiB
www.google-analytics.com/analytics.js7200.0 s20.9 KiB
la2.vnecdn.net/static/adp_banner.js900.0 s12.8 KiB
scdn.eclick.vn/delivery/asset/355353918/adsbyeclick.js86400.0 s16.9 KiB
/AjD93LOobHdHoquREgIFv4XQ29o3uINtos53vXXlfSZezE0fkZvfQ1r_...86400.0 s2.7 KiB
boot.pbstck.com/v1/tag/f72b4183-fbfb-40d8-a968-07b6e53f85a51200.0 s849 B
s.eclick.vn/delivery/inventory.js86400.0 s1.6 KiB
/widget/index/?s=1000000&cid=5065934-13;5065602-1;5065887...60.0 s606 B
/cookie?redirect_url=https%3A%2F%2Fprebid-server.pbstck.c...0.0 ms519 B
scdn.eclick.vn/delivery/dfp/bad.js3600.0 s342 B
s.eclick.vn/bad.js86400.0 s315 B
creativecdn.com/cm-notify?pi=pubstack-pbs&gdpr=&gdpr_consent=&us_privacy=&tc=10.0 ms124 B

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.024301] map[node:map[boundingRect:map[bottom:26263 height:26263 left:0 right:412 top:0 width:412] lhId:page-1-BODY nodeLabel:body#home_page path:1,HTML,1,BODY selector:body#home_page snippet:<body class="body_mobile personalized-page " id="home_page" data-checkpage="1" data-source="Home" style="overflow: hidden;"> type:node] score:0.024301]]
headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:1.003398] map[node:map[boundingRect:map[bottom:26263 height:26263 left:0 right:412 top:0 width:412] lhId:page-1-BODY nodeLabel:body#home_page path:1,HTML,1,BODY selector:body#home_page snippet:<body class="body_mobile personalized-page " id="home_page" data-checkpage="1" data-source="Home" style="overflow: hidden;"> type:node] score:1] map[node:map[boundingRect:map[bottom:560 height:90 left:20 right:390 top:469 width:370] lhId:page-2-A nodeLabel:Xe container khi đổ dốc cầu Phú Mỹ đã tông vào chiếc Porsche, rồi đẩy dồn thêm … path:1,HTML,1,BODY,21,SECTION,0,ARTICLE,2,P,1,A selector:section#top_story > article.art_item > p.short_intro > a snippet:<a data-medium="Item-1" data-thumb="1" href="https://vnexpress.net/camera-ghi-canh-xe-container-tong-lien-hoan-5-oto-tr…" data-event-category="Article Link Click" data-event-action="ThuongVien" data-event-label="Item-1" data-itm-source="#vn_source=Home&amp;vn_campaign=ThuongVien&amp;vn_medium=Item-1&amp;vn_term=Mobile&amp;vn_…" data-itm-added="1"> type:node] score:0.003398 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://s1cdn.vnecdn.net/vnexpress/restruct/c/v3897/v2/fonts/Merriweather-Bold.woff]] map[cause:Web font extra:map[type:url value:https://s1cdn.vnecdn.net/vnexpress/restruct/c/v3897/v2/fonts/Merriweather-Regular.woff]]] type:subitems]]]
headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.022398] map[node:map[boundingRect:map[bottom:730 height:637 left:21 right:391 top:93 width:371] lhId:page-7-DIV nodeLabel:vnexpress asks for your consent to use your personal data to: Personalised adve… path:1,HTML,1,BODY,103,DIV,1,DIV selector:body#home_page > div.fc-consent-root > div.fc-dialog-container snippet:<div class="fc-dialog-container"> type:node] score:0.022398 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:37 height:28 left:-281 right:-131 top:9 width:150] lhId:page-19-IMG nodeLabel:Báo VnExpress - Báo tiếng Việt nhiều người xem nhất path:1,HTML,1,BODY,74,NAV,0,DIV,1,A,0,IMG selector:nav#main_menu > div.header_menu > a.logo-on-menu > img.lazyInitial snippet:<img src="https://s1cdn.vnecdn.net/vnexpress/restruct/i/v9805/mobile_redesign/graphi…" alt="Báo VnExpress - Báo tiếng Việt nhiều người xem nhất" class="lazyInitial lazyLoaded" data-was-processed="true"> type:node]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/opensans/v40/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2]]] type:subitems]]]
headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.038215] map[node:map[boundingRect:map[bottom:586 height:446 left:0 right:412 top:140 width:412] lhId:page-8-SECTION nodeLabel:Camera ghi cảnh xe container tông liên hoàn 5 ôtô trên cầu Phú Mỹ TP HCMXe con… path:1,HTML,1,BODY,21,SECTION selector:body#home_page > section#top_story snippet:<section data-cnh="{&quot;execule&quot;:[5065934,5065538,5065887,5065602,5065618,5065636,5065881,506557…" class="section" id="top_story" data-campaign="ThuongVien" data-page-name="home"> type:node] score:0.038215]]

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLEst Savings
/s/opensans/v40/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu...40 ms

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:55.908 source:map[type:text value:[unattributed]]] map[reflowTime:0.308 source:map[column:499 line:29 type:source-location url:https://s1cdn.vnecdn.net/vnexpress/restruct/j/v8822/redesign/helper/lazyload.js urlProvider:network]] map[reflowTime:0.159 source:map[column:398 line:17 type:source-location url:https://scdn.eclick.vn/delivery/dfp/ov_mb_vne_home_home.js urlProvider:network]] map[reflowTime:0.425 source:map[column:169 line:104 type:source-location url:https://scdn.eclick.vn/delivery/dfp/ov_mb_vne_home_home.js urlProvider:network]] map[reflowTime:1.003 source:map[column:74 line:10 type:source-location url:https://scdn.eclick.vn/delivery/dfp/ov_mb_vne_home_home.js urlProvider:network]]]

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
Vne Go hgroup.width_common > h2.parent-cate > a.inner-title > img
s1cdn.vnecdn.net/vnexpress/restruct/i/v9805/graphics/vne-go.png69.9 KiB69.3 KiB
Cuộc sống trên 'quả cầu lửa' gần eo biển Hormuz article.art_item > div.thumb_art > a.thumb_img > img.vne_lazy_image
/2026/04/21/ap26109754355697-1776746863-9597-1776746933.j...64.2 KiB58.4 KiB
Thế bế tắc trong đàm phán Mỹ - Iran article.art_item > div.thumb_art > a.thumb_img > img.vne_lazy_image
/2026/04/22/ap26101141501437-1776846430-9775-1776846873.j...62.1 KiB56.2 KiB
Iran cảnh báo láng giềng 'chuẩn bị vĩnh biệt sản xuất dầu' article.art_item > div.thumb_art > a.thumb_img > img.vne_lazy_image
/2026/04/22/afpea3n8-v2-highres-topshotqat-6079-9367-1776...51.7 KiB45.8 KiB
Loạt dự án chống ngập khẩn cấp Hà Nội đang triển khai article.item-ev > div.thumb-ev > a.thumb > img.vne_lazy_image
/2026/04/16/Sequence0100000000Still001-177-7354-5335-1776...67.3 KiB40.7 KiB
Công nghệ phát hiện 'trị' deepfake article.art_item > div.thumb_art > a.thumb_img > img.vne_lazy_image
/2026/04/21/gemini-generated-imagegl4ab8gl-2379-3752-1776...64.4 KiB39.9 KiB
Thả hổ mang chúa 10 kg bắt trong bệnh viện về rừng article.item-ev > div.thumb-ev > a.thumb > img.vne_lazy_image
/2026/04/22/base641776764904378902128300-1-5955-6659-1776...66.3 KiB39.7 KiB
Cận cảnh rạp xiếc hiện đại nhất TP HCM article.item-ev > div.thumb-ev > a.thumb > img.vne_lazy_image
/2026/04/22/20260422125017-1776837050-4186-1776837086.jpg...61.9 KiB35.3 KiB
Vì sao chứng khoán Mỹ vẫn tăng dù xung đột leo thang article.art_item > div.thumb_art > a.thumb_img > img.vne_lazy_image
/2026/04/22/screenshot-1776850140-7965-1776850307.png?w=5...56.4 KiB32.0 KiB
Ông Trump: Đàm phán Mỹ - Iran 'có thể diễn ra trong 3 ngày tới' article.art_item > div.thumb_art > a.thumb_img > img.vne_lazy_image
/2026/04/22/islamabad-1776872674-2017-1776872715.jpg?w=38...40.8 KiB26.7 KiB
Dàn đại bác khai hỏa trong lễ đón Tổng thống Hàn Quốc article.item-ev > div.thumb-ev > a.thumb > img.vne_lazy_image
/2026/04/22/anhmanhinh20260422luc192515-17-1592-7104-1776...51.6 KiB25.0 KiB
Bi kịch của chàng trai du học Australia với khát vọng đổi đời article.art_item > div.thumb_art > a.thumb_img > img.vne_lazy_image
/2026/04/22/bikramlamadeathbody-1776830655-6644-177683082...45.8 KiB21.3 KiB
Cách Trung Quốc đứng vững trước cú sốc phân bón nhờ than đá article.art_item > div.thumb_art > a.thumb_img > img.vne_lazy_image
/2026/04/22/72y4s3xt6nia7ka5nbyyppkygy-177-6317-9670-1776...45.2 KiB20.8 KiB
Loạt nhà khoa học Mỹ chết, mất tích, FBI vào cuộc điều tra article.art_item > div.thumb_art > a.thumb_img > img.vne_lazy_image
/2026/04/22/fbi-jpg-1776864478-4380-1776864794.jpg?w=500&...44.2 KiB19.7 KiB
Đêm định mệnh của thiếu nữ trong chuyến du lịch cùng lớp article.art_item > div.thumb_art > a.thumb_img > img.vne_lazy_image
/2026/04/22/netflix-1776857485-4736-1776859314.png?w=380&...32.9 KiB18.8 KiB
Đường dây hoang báo bị cướp để được cấp visa ở lại Mỹ article.art_item > div.thumb_art > a.thumb_img > img.vne_lazy_image
/2026/04/22/louisiana-1776829531-2674-1776829801.jpg?w=38...29.1 KiB15.0 KiB
Trùm ma tuý người Nigeria bị cảnh sát khống chế giữa Bangkok article.item-ev > div.thumb-ev > a.thumb > img.vne_lazy_image
/2026/04/21/20260421172655-1776767223-3313-1776767234.png...31.2 KiB14.2 KiB
Iran tuyên bố bắt giữ hai tàu hàng tìm cách qua eo biển Hormuz article.art_item > div.thumb_art > a.thumb_img > img.vne_lazy_image
/2026/04/22/1405020214083747336497514-1776-6099-8007-1776...28.1 KiB14.0 KiB
Camera ghi cảnh xe container tông liên hoàn 5 ôtô trên cầu Phú Mỹ article.art_item > div.thumb_art > a.thumb_img > img.vne_lazy_image
/2026/04/22/20260422235825-1776877128-7202-1776877168.png...38.4 KiB14.0 KiB
Việt Nam thắng ngược Australia để vào chung kết U17 Đông Nam Á article.art_item > div.thumb_art > a.thumb_img > img.vne_lazy_image
/2026/04/22/z7753064764511-c3ccb1db5c8016e-6113-6856-1776...27.6 KiB13.5 KiB
Hệ thống giúp tàu sân bay Mỹ tạo ra 1,5 triệu lít nước ngọt mỗi ngày article.art_item > div.thumb_art > a.thumb_img > img.vne_lazy_image
/2026/04/22/Lincoln-1776841157-6001-1776842166.png?w=500&...35.8 KiB11.4 KiB
ICE bắt giam vợ lính Mỹ article.art_item > div.thumb_art > a.thumb_img > img.vne_lazy_image
/2026/04/22/18932719-cc-gma-couple-wife-de-8310-3702-1776...23.1 KiB9.0 KiB
Va vào dây điện, máy bay cỡ nhỏ rơi ở Los Angeles article.item-ev > div.thumb-ev > a.thumb > img.vne_lazy_image
/2026/04/22/roimaybayla00000419still001-17-2207-1604-1776...31.2 KiB4.6 KiB

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-IMG
nodeLabel: Camera ghi cảnh xe container tông liên hoàn 5 ôtô trên cầu Phú Mỹ
path: 1,HTML,1,BODY,21,SECTION,0,ARTICLE,0,DIV,0,A,0,IMG
selector: article.art_item > div.thumb_art > a.thumb_img > img.vne_lazy_image
snippet: <img src="https://vcdn1-vnexpress.vnecdn.net/2026/04/22/20260422235825-1776877128-72…" class="vne_lazy_image lazyInitial lazyLoaded" data-original="https://vcdn1-vnexpress.vnecdn.net/2026/04/22/20260422235825-1776877128-72…" data-original-2x="https://vcdn1-vnexpress.vnecdn.net/2026/04/22/20260422235825-1776877128-72…" data-original-video="" alt="Camera ghi cảnh xe container tông liên hoàn 5 ôtô trên cầu Phú Mỹ" data-retry-count="0" data-was-processed="true">

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLProtocol
/2026/04/22/20260422235825-1776877128-7202-1776877168.png...http/1.1
/2026/04/22/bikramlamadeathbody-1776830655-6644-177683082...http/1.1
/2026/04/22/fbi-jpg-1776864478-4380-1776864794.jpg?w=500&...http/1.1
/2026/04/22/Lincoln-1776841157-6001-1776842166.png?w=500&...http/1.1
/2026/04/22/18932719-cc-gma-couple-wife-de-8310-3702-1776...http/1.1
/2026/04/22/ap26101141501437-1776846430-9775-1776846873.j...http/1.1
/2026/04/21/ap26109754355697-1776746863-9597-1776746933.j...http/1.1
/2026/04/22/afpea3n8-v2-highres-topshotqat-6079-9367-1776...http/1.1
/2026/04/21/gemini-generated-imagegl4ab8gl-2379-3752-1776...http/1.1
/2026/04/22/netflix-1776857485-4736-1776859314.png?w=380&...http/1.1
/2026/04/22/louisiana-1776829531-2674-1776829801.jpg?w=38...http/1.1
/2026/04/22/anhmanhinh20260422luc192515-17-1592-7104-1776...http/1.1
/2026/04/22/top1-1776840134-9873-1776840198.jpg?w=330&h=4...http/1.1
/2026/04/22/20260422125017-1776837050-4186-1776837086.jpg...http/1.1
/2026/04/22/roimaybayla00000419still001-17-2207-1604-1776...http/1.1
/2026/04/22/base641776764904378902128300-1-5955-6659-1776...http/1.1
/2026/04/16/Sequence0100000000Still001-177-7354-5335-1776...http/1.1
/2026/04/21/20260421172655-1776767223-3313-1776767234.png...http/1.1
/2025/09/06/bpng-1757138134.png?w=180&h=180&q=100&dpr=1&f...http/1.1
/2026/04/22/islamabad-1776872674-2017-1776872715.jpg?w=38...http/1.1
/2026/04/22/1405020214083747336497514-1776-6099-8007-1776...http/1.1
/2026/04/22/43c9a6ab-e0bda3dc32-bb306dc300-1400-8709-1776...http/1.1
/2026/04/22/z7752363911975-de31397556961ad-1337-5726-1776...http/1.1
/2026/04/22/img4151-1776861739-2792-1776861752.jpg?w=380&...http/1.1
/2026/04/22/pyramidsinsudanaforgottennubia-1909-3483-1776...http/1.1
/2026/04/23/tainan-1776880884.jpg?w=380&h=228&q=100&dpr=1...http/1.1
/2026/04/22/z4187091657257cb00a003ecb170b7-4636-3375-1776...http/1.1
/2026/04/22/IMG-0047-JPG-1776847031.jpg?w=100&h=100&q=100...http/1.1
/2026/04/22/z7752304680605d144e1d10a1e4c17-5472-6347-1776...http/1.1
/2026/04/22/2024t000000z-mt1nurpho000kpvqx-1634-2234-1776...http/1.1
/2026/04/22/a14-1776830150.jpg?w=500&h=300&q=100&dpr=1&fi...http/1.1
/2026/04/22/30-9536-1776876155.jpg?w=100&h=100&q=100&dpr=...http/1.1
/2026/04/22/bongraduong-1776870792-3790-1776871049.jpg?w=...http/1.1
/2026/04/22/screenshot-1776846875-3472-1776846965.png?w=1...http/1.1

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 2.0 s
URLTime Spent
vnexpress.net/2.0 s
vnexpress.net/0.0 ms

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

ElementLayout shift score
body#home_page body#home_page
1.000
Camera ghi cảnh xe container tông liên hoàn 5 ôtô trên cầu Phú Mỹ TP HCMXe con… body#home_page > section#top_story
0.038
body#home_page body#home_page
0.024
vnexpress asks for your consent to use your personal data to: Personalised adve… body#home_page > div.fc-consent-root > div.fc-dialog-container
0.022
Xe container khi đổ dốc cầu Phú Mỹ đã tông vào chiếc Porsche, rồi đẩy dồn thêm … section#top_story > article.art_item > p.short_intro > a
0.003

Diagnostics

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 690 ms 2.1 MiB
URLTransfer SizeEst Savings
la2.vnecdn.net/static/device_model_min.js614.0 KiB432.1 KiB
la2.vnecdn.net/static/device_model_min.js614.0 KiB432.1 KiB
la4.vnecdn.net/static/device_model_min.js613.9 KiB432.1 KiB
/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31...187.7 KiB129.9 KiB
/vnexpress/restruct/j/v8822/redesign/helper/mgeneral_pers...116.8 KiB88.8 KiB
s1cdn.vnecdn.net/vnexpress/restruct/j/v8822/evisual/main.js84.3 KiB82.4 KiB
accounts.google.com/gsi/client95.6 KiB67.8 KiB
www.googletagmanager.com/gtag/js?id=G-57577CKS2C&cx=c&gtm=4e64k0169.4 KiB67.2 KiB
www.googletagmanager.com/gtag/js?id=G-8DHKH6QPCD&cx=c&gtm=4e64k0157.1 KiB64.8 KiB
www.googletagmanager.com/gtag/js?id=G-DQJ7NF9DN2&cx=c&gtm=4e64k0150.7 KiB63.6 KiB
www.googletagmanager.com/gtm.js?id=GTM-NMB96XWK124.3 KiB63.3 KiB
octopus-stream01-cads.fpt.vn/cdp.js129.0 KiB53.5 KiB
scdn.eclick.vn/delivery/dfp/prebid.js131.7 KiB51.4 KiB
www.googletagmanager.com/gtm.js?id=GTM-N3FNJF174.3 KiB50.4 KiB
s1cdn.vnecdn.net/vnexpress/restruct/j/v8822/v3/production/wpn.js86.1 KiB48.5 KiB
fundingchoicesmessages.google.com/i/21928950349?ers=368.8 KiB35.4 KiB
s1cdn.vnecdn.net/myvne/j/v416/m_myvne_users_v3.js29.8 KiB21.1 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTotal CPU TimeScript EvaluationScript Parse
vnexpress.net/2.7 s216 ms56 ms
/vnexpress/restruct/j/v8822/redesign/helper/mgeneral_pers...2.2 s1.3 s55 ms
Unattributable2.2 s137 ms0.0 ms
s1cdn.vnecdn.net/vnexpress/restruct/j/v1294/eclick/ea3.js1.0 s686 ms3.1 ms
s1cdn.vnecdn.net/vnexpress/restruct/j/v8822/widget/libs/ic.js963 ms927 ms1.7 ms
www.googletagmanager.com/gtm.js?id=GTM-N3FNJF723 ms639 ms63 ms
s1cdn.vnecdn.net/vnexpress/restruct/j/v8822/redesign/require.js650 ms598 ms21 ms
/f/AGSKWxVnXfMti3fOmW3ZiDS7Sr_q_h3Y9f_fizXKaZMfPLoBM_E5VO...544 ms343 ms44 ms
scdn.eclick.vn/delivery/dfp/prebid.js539 ms492 ms33 ms
www.googletagmanager.com/gtag/js?id=G-8DHKH6QPCD&cx=c&gtm=4e64k0312 ms226 ms37 ms
fundingchoicesmessages.google.com/i/21928950349?ers=3272 ms249 ms18 ms
scdn.eclick.vn/delivery/dfp/ov_mb_vne_home_home.js257 ms209 ms15 ms
/widget/index/?s=1000000&cid=5065934-13;5065602-1;5065887...253 ms207 ms0.6 ms
la2.vnecdn.net/static/device_model_min.js243 ms77 ms165 ms
/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31...234 ms168 ms49 ms
www.googletagmanager.com/gtm.js?id=GTM-NMB96XWK215 ms180 ms30 ms
boot.pbstck.com/v1/tag/f72b4183-fbfb-40d8-a968-07b6e53f85a5199 ms149 ms34 ms
www.googletagmanager.com/gtag/js?id=G-57577CKS2C&cx=c&gtm=4e64k0191 ms149 ms40 ms
octopus-stream01-cads.fpt.vn/cdp.js189 ms161 ms13 ms
s1cdn.vnecdn.net/vnexpress/restruct/j/v8822/redesign/helper/lazyload.js182 ms89 ms2.1 ms
www.googletagmanager.com/gtag/js?id=G-DQJ7NF9DN2&cx=c&gtm=4e64k0164 ms125 ms38 ms
scdn.eclick.vn/delivery/asset/355353918/adsbyeclick.js131 ms92 ms3.5 ms
s1cdn.vnecdn.net/vnexpress/restruct/j/v8822/redesign/helper/jquery.min.js127 ms95 ms9.0 ms
accounts.google.com/gsi/client115 ms81 ms28 ms
securepubads.g.doubleclick.net/tag/js/gpt.js108 ms95 ms13 ms
s1cdn.vnecdn.net/myvne/j/v416/plugins/vne_v3.js73 ms67 ms1.8 ms
la4.vnecdn.net/static/device_model_min.js71 ms24 ms46 ms
www.google-analytics.com/analytics.js69 ms40 ms16 ms
s1cdn.vnecdn.net/vnexpress/restruct/j/v8822/v3/production/widget/myvne_hint.js57 ms48 ms6.8 ms
s1cdn.vnecdn.net/vnexpress/restruct/j/v8822/ldpr/jquery-2.1.4.min.js57 ms43 ms6.9 ms
s1cdn.vnecdn.net/vnexpress/restruct/j/v8822/v3/production/wpn.js55 ms43 ms7.6 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Script Evaluation8.3 s
Other4.0 s
Style & Layout1.2 s
Script Parsing & Compilation993 ms
Rendering615 ms
Parse HTML & CSS339 ms
Garbage Collection318 ms

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 188.5 KiB
URLTransfer SizeEst Savings
s1cdn.vnecdn.net/vnexpress/restruct/c/v3897/v2/mobile_redesign/font-Inter.css150.8 KiB150.8 KiB
s1cdn.vnecdn.net/vnexpress/restruct/c/v3897/v2/mobile_redesign/mgeneral.css24.5 KiB23.7 KiB
.fc-consent-root .fc-dialog-container.fc-fullscreen { height: 100% !important; … } …16.2 KiB13.9 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer Size
/vnexpress/restruct/i/v9805/mobile_redesign/icons/app_ngo...773.0 KiB
la2.vnecdn.net/static/device_model_min.js614.3 KiB
la4.vnecdn.net/static/device_model_min.js614.2 KiB
/vnexpress/restruct/c/v3897/v2_2019/pc/weather/icon-demo/...571.3 KiB
s1cdn.vnecdn.net/vnexpress/restruct/i/v9805/retina.jpg?timestamp=1776888589835498.9 KiB
/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31...187.7 KiB
www.googletagmanager.com/gtm.js?id=GTM-N3FNJF174.3 KiB
www.googletagmanager.com/gtag/js?id=G-57577CKS2C&cx=c&gtm=4e64k0169.4 KiB
www.googletagmanager.com/gtag/js?id=G-8DHKH6QPCD&cx=c&gtm=4e64k0157.2 KiB
s1cdn.vnecdn.net/vnexpress/restruct/c/v3897/v2/mobile_redesign/font-Inter.css150.9 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
Vne Go hgroup.width_common > h2.parent-cate > a.inner-title > img
s1cdn.vnecdn.net/vnexpress/restruct/i/v9805/graphics/vne-go.png
app_ns p.left > a > span > img
/vnexpress/restruct/i/v9805/mobile_redesign/icons/app_ngo...
app_ns p.left > a > span > img.lazyLoaded
/vnexpress/restruct/i/v9805/mobile_redesign/icons/app_ngo...
netzero div.box-head > h3 > a > img
s1cdn.vnecdn.net/vnexpress/restruct/i/v9805/graphics/netzero.png
VnExpress - Bao tieng Viet nhieu nguoi xem nhat header#header > h1 > a.img_logo > img.lazyInitial
/vnexpress/restruct/i/v9805/mobile_redesign/graphics/logo...
Doanh nghiệp vươn mình div.box-head > h3 > a > img
s1cdn.vnecdn.net/vnexpress/restruct/i/v9805/graphics/logo-mbbank.png
Báo VnExpress - Báo tiếng Việt nhiều người xem nhất nav#main_menu > div.header_menu > a.logo-on-menu > img.lazyInitial
/vnexpress/restruct/i/v9805/mobile_redesign/graphics/logo...
app_vne p.right > a > span > img
s1cdn.vnecdn.net/vnexpress/restruct/i/v9805/mobile_redesign/icons/app_evne.svg
app_vne p.right > a > span > img.lazyLoaded
s1cdn.vnecdn.net/vnexpress/restruct/i/v9805/mobile_redesign/icons/app_evne.svg
p.right > a > span > img p.right > a > span > img
s1cdn.vnecdn.net/vnexpress/restruct/i/v9805/mobile_redesign/icons/app_vm.png
p.right > a > span > img.lazyLoaded p.right > a > span > img.lazyLoaded
s1cdn.vnecdn.net/vnexpress/restruct/i/v9805/mobile_redesign/icons/app_vm.png
app_vne p.left > a > span > img
s1cdn.vnecdn.net/vnexpress/restruct/i/v9805/mobile_redesign/icons/app_vne.svg
app_vne p.left > a > span > img.lazyLoaded
s1cdn.vnecdn.net/vnexpress/restruct/i/v9805/mobile_redesign/icons/app_vne.svg
section.inner_section > div.gopy-vne > a.flexbox > img section.inner_section > div.gopy-vne > a.flexbox > img
/vnexpress/restruct/i/v9805/mobile_redesign/graphics/ico-...

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Document request latency
●Optimize DOM size
●LCP breakdown
●Network dependency tree
●Render blocking requests
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 19 user timings
●Avoid long main-thread tasks 20 long tasks found
●Avoid non-composited animations 8 animated elements found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 270 ms
●Server Backend Latencies 370 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 190 ms
○INP breakdown
87

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Names and labels

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.block_scoll_menu > div.block_search > form#search > button#auto_search_button div.block_scoll_menu > div.block_search > form#search > button#auto_search_button

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
section#box_gocnhin_home > div.content_box_gocnhin > div.author_gocnhin > a.icon_commend section#box_gocnhin_home > div.content_box_gocnhin > div.author_gocnhin > a.icon_commend

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.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
33° section.head-weather-today > div.weather > a > span.humidity
26° section.head-weather-today > div.weather > a > span.air
Advertisement div.banner_mobile_300x250 > div.inner_ads > span.text_ads > span.txt_qc
Advertisement div.banner_mobile_300x250 > div.inner_ads > span.text_ads > span.txt_qc
Luật sư section#box_gocnhin_home > div.content_box_gocnhin > div.author_gocnhin > span.position_author
Giá div.box-content-wrap > div.box-header > div.col-headers > span.w-gia
-720 div.box-content > div.row-content > div.price-col > span.change
-3.190 div.box-content > div.row-content > div.price-col > span.change
Từ 16:00 21/4/2026 div.price-box > div.box-content-wrap > div.box-footer > span.mb-only
Đơn vị: VND/lít div.price-box > div.box-content-wrap > div.box-footer > span.mb-only
Advertisement div.banner_mobile_300x250 > div.inner_ads > span.text_ads > span.txt_qc
Advertisement div.banner_mobile_300x250 > div.inner_ads > span.text_ads > span.txt_qc
Mua div.box-content-wrap > div.box-header > div.col-headers > span.w-mua
Bán div.box-content-wrap > div.box-header > div.col-headers > span.w-ban
(USD/ounce) a > div.row-content > div.name-col > span.unit
(triệu đồng/lượng) a > div.row-content > div.name-col > span.unit
1 tháng div.box-content-wrap > div.box-content > div.col-rate > span.lbl
3 tháng div.box-content-wrap > div.box-content > div.col-rate > span.lbl
6 tháng div.box-content-wrap > div.box-content > div.col-rate > span.lbl
Advertisement div.banner_mobile_300x250 > div.inner_ads > span.text_ads > span.txt_qc
Advertisement section.section > div.banner_mobile_300x250 > div.inner_ads > span.text_ads
Learn more div.fc-dialog-content > div.fc-dialog-scrollable-content > button.fc-faq-header > span.fc-faq-label

These are opportunities to improve the legibility of your content.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Camera ghi cảnh xe container tông liên hoàn 5 ôtô trên cầu Phú Mỹ body#home_page > section#top_story > article.art_item > h4.title_news

These are opportunities to improve keyboard navigation in your application.

○Interactive controls are keyboard focusable
○Interactive elements indicate their purpose and state
○The page has a logical tab order
○Visual order on the page follows DOM order
○User focus is not accidentally trapped in a region
○The user's focus is directed to new content added to the page
○HTML5 landmark elements are used to improve navigation
○Offscreen content is hidden from assistive technology
○Custom controls have associated labels
○Custom controls have ARIA roles
●`[aria-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Image elements have `[alt]` attributes
●Form elements have associated labels
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●ARIA attributes are used as specified for the element's role
●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links are distinguishable without relying on color.
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Touch targets have sufficient size and spacing.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Uses ARIA roles only on compatible elements
●Image elements do not have `[alt]` attributes that are redundant text.
●Identical links have the same purpose.
●Elements with visible text labels have matching accessible names.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
○`[role]`s are contained by their required parent element
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○The page contains a heading, skip link, or landmark region
○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
○Definition list items are wrapped in `<dl>` elements
○ARIA IDs are unique
○No form fields have multiple labels
○`<frame>` or `<iframe>` elements have a title
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[lang]` attributes have a valid value
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
73

Best Practices

Trust and Safety

Users are mistrustful of or confused by sites that request to send notifications without context. Consider tying the request to user gestures instead. Learn more about responsibly getting permission for notifications.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Source
s1cdn.vnecdn.net/vnexpress/restruct/j/v8822/v3/production/wpn.js

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / WarningSource
Topics
scdn.eclick.vn/delivery/dfp/prebid.js line 11, col 85659
Specifying overflow: visible on img, video and canvas tags may cause them to produce visual content outside of the element bounds. See https://github.com/WICG/shared-element-transitions/blob/main/debugging_overflow_on_images.md.
/_/mss/boq-content-ads-contributor/_/js/k=boq-content-ads... line 19, col 449

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

SourceDescription
accounts.google.com/gsi/client line 85, col 88
[GSI_LOGGER]: FedCM get() rejects with NetworkError: Error retrieving a token.
vnexpress.net/
Attestation check for Protected Audience on https://display.bidder.taboola.com failed.
vnexpress.net/
Attestation check for Protected Audience on https://grid-bidder.criteo.com failed.
vnexpress.net/
Attestation check for Protected Audience on https://hbopenbid.pubmatic.com failed.
vnexpress.net/
Attestation check for Protected Audience on https://htlb.casalemedia.com failed.
vnexpress.net/
Attestation check for Protected Audience on https://targeting.unrulymedia.com failed.
vnexpress.net/
Not signed in with the identity provider.
●Uses HTTPS
●Avoids third-party cookies
●Allows users to paste into input fields
●Avoids requesting the geolocation permission on page load
●Displays images with correct aspect ratio
●Serves images with appropriate resolution
●Page has the HTML doctype
●Properly defines charset
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
92

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Crawling and Indexing

Search engines may use `href` attributes on links to crawl websites. Ensure that the `href` attribute of anchor elements links to an appropriate destination, so more pages of the site can be discovered. Learn how to make links crawlable

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
div#myvne_taskbar > ul.myvne_form_log > li.myvne_user > a.myvne_icon div#myvne_taskbar > ul.myvne_form_log > li.myvne_user > a.myvne_icon

To appear in search results, crawlers need access to your app.

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Document has a meta description
●Page has successful HTTP status code
●Links have descriptive text
●robots.txt is valid
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

Send Feedback