Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

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.

Request	Cache TTL	Transfer Size
cdn.blablacar.com/discover/bus/FR/reims-2.webp	3600.0 s	105.0 KiB
cdn.blablacar.com/discover/bus/FR/paris-2.webp	3600.0 s	84.4 KiB
/056c49dd-4442-400c-886a-bcd1e29dc2cd/loader.js?target=ww...	7200.0 s	46.4 KiB
ddome-tag.blablacar.com/tags.js	3600.0 s	42.7 KiB
try.abtasty.com/8c952bdd9cb88033ffef07632e185107.js	30.0 s	2.8 KiB
cdn.blablacar.com/didomi/blablacar-logo-2.svg	3600.0 s	2.3 KiB
www.blablacar.fr/browser-support	0.0 ms	81 B

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.

	URL	Resource Size	Est Savings
Voyagez à Arles avec BlaBlaCar `div.kz4wo41z4 > div.kz4wo41m7 > div.kz4wo41m2 > img.zj5dd93`	cdn.blablacar.com/k/a/images/destination_FR_1510x822-2e0186ae82c442bc.webp	182.7 KiB	150.2 KiB
Bus vers Reims `div.rtz7ut0 > div._1krek2x0 > div._1krek2x1 > img.zj5dd91`	cdn.blablacar.com/discover/bus/FR/reims-2.webp	105.0 KiB	73.0 KiB
Utilisatrice BlaBlaCar qui enlasse sa soeur rencontrée par hasard dans un covoi… `div.kz4wo41z4 > div.kz4wo41m7 > div.kz4wo41m2 > img.zj5dd93`	cdn.blablacar.com/k/a/images/ugc_FR_1428x777-39da4253b8c38e64.webp	75.4 KiB	60.4 KiB
Bus vers Paris `div.rtz7ut0 > div._1krek2x0 > div._1krek2x1 > img.zj5dd91`	cdn.blablacar.com/discover/bus/FR/paris-2.webp	84.4 KiB	54.1 KiB
Les billets de trains SNCF disponibles sur l'appli BlaBlaCar `div.kz4wo41z4 > div.kz4wo41m7 > div.kz4wo41m2 > img.zj5dd93`	cdn.blablacar.com/k/a/images/whatsnew_FR_1103x601-72e7330368b813aa.webp	26.8 KiB	17.8 KiB

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
try.abtasty.com/8c952bdd9cb88033ffef07632e185107.js	2.8 KiB	851 ms
cdn.blablacar.com/k/a/6215.85b3da5d82c18cab.css	42.7 KiB	1.1 s
cdn.blablacar.com/k/a/seo-footer.d90a93946ef31873.chunk.css	632 B
cdn.blablacar.com/k/a/Home.75e998ce5769724a.chunk.css	2.6 KiB

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

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.

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

Diagnostics

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 150 ms 9.3 KiB

URL	Transfer Size	Est Savings
cdn.blablacar.com/k/a/6215.85b3da5d82c18cab.css	42.7 KiB	9.3 KiB

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: 300 ms 54.5 KiB

URL	Transfer Size	Est Savings
cdn.blablacar.com/k/a/6215.85b3da5d82c18cab.css	42.4 KiB	40.6 KiB
	16.9 KiB	13.9 KiB

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: 3.0 s 656.0 KiB

URL	Transfer Size	Est Savings
cdn.blablacar.com/k/a/6215.6f0cd314c52834b7.js	409.6 KiB	246.0 KiB
cdn.blablacar.com/k/a/index.59085c37e31fdd97.js	435.5 KiB	218.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-TVPFSZ	174.4 KiB	79.2 KiB
cdn.blablacar.com/k/a/6187.cab3118d515f4ea4.chunk.js	65.4 KiB	47.7 KiB
/sdk/c8e2e67c354c0d6dec2981e079061b37f6a1f337/modern/sdk....	89.5 KiB	44.4 KiB
try.abtasty.com/8c952bdd9cb88033ffef07632e185107/main.51be40c215b8bdf2eeec.js	45.9 KiB	20.4 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.

URL	Total CPU Time	Script Evaluation	Script Parse
cdn.blablacar.com/k/a/6215.6f0cd314c52834b7.js	1.6 s	1.2 s	154 ms
cdn.blablacar.com/k/a/index.59085c37e31fdd97.js	865 ms	576 ms	272 ms
www.blablacar.fr/	759 ms	52 ms	7.2 ms
Unattributable	660 ms	101 ms	0.0 ms
ddome-tag.blablacar.com/tags.js	290 ms	252 ms	14 ms
www.googletagmanager.com/gtm.js?id=GTM-TVPFSZ	284 ms	230 ms	51 ms
/sdk/c8e2e67c354c0d6dec2981e079061b37f6a1f337/modern/sdk....	206 ms	168 ms	37 ms
/sdk/c8e2e67c354c0d6dec2981e079061b37f6a1f337/modern/ui-w...	204 ms	139 ms	22 ms
cdn.blablacar.com/k/a/intl-locale.4cdbb20b883ba444.chunk.js	183 ms	172 ms	6.4 ms
cdn.blablacar.com/k/a/9245.708db02cfe26ed36.chunk.js	178 ms	128 ms	25 ms
cdn.blablacar.com/k/a/6187.cab3118d515f4ea4.chunk.js	154 ms	116 ms	22 ms
cdn.blablacar.com/k/a/kairos-translations_fr-FR.47d8fa050c9ac1c0.chunk.js	122 ms	65 ms	55 ms
try.abtasty.com/8c952bdd9cb88033ffef07632e185107/main.51be40c215b8bdf2eeec.js	88 ms	62 ms	25 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.

Category	Time Spent
Script Evaluation	3.4 s
Other	890 ms
Script Parsing & Compilation	774 ms
Style & Layout	300 ms
Rendering	181 ms
Garbage Collection	176 ms
Parse HTML & CSS	70 ms

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
Logo `div.didomi-popup-container > div.didomi-popup-view > div.didomi-popup-notice-logo-container > img.didomi-popup-notice-logo`	cdn.blablacar.com/didomi/blablacar-logo-2.svg
div.rx4q520 > div.kz4wo41m2 > div._9heuur0 > img._174ntao0 `div.rx4q520 > div.kz4wo41m2 > div._9heuur0 > img._174ntao0`	cdn.blablacar.com/k/a/images/train-ddad23818cd7909f.svg

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

●Layout shift culprits

●Document request latency

●Optimize DOM size

●Font display

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify JavaScript

●Avoids enormous network payloads Total size was 2,425 KiB

●User Timing marks and measures 3 user timings

●Avoid long main-thread tasks 17 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 30 ms

●Server Backend Latencies 80 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 20 ms

●Avoid large layout shifts 1 layout shift found

○INP breakdown

○LCP request discovery

○Avoid non-composited animations

100

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.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Customize cookie settings `div.didomi-popup-container > div.didomi-popup-view > div#buttons > button#didomi-notice-learn-more-button`
Reject all `div.didomi-popup-container > div.didomi-popup-view > div#buttons > button#didomi-notice-disagree-button`
Accept and continue `div.didomi-popup-container > div.didomi-popup-view > div#buttons > button#didomi-notice-agree-button`
Metz 6,99 € `div.kz4wo41z4 > ul > li > a.gk14de1`
Nancy 5,49 € `div.kz4wo41z4 > ul > li > a.gk14de1`
Chessy 2,99 € `div.kz4wo41z4 > ul > li > a.gk14de1`
Paris - Aéroport Roissy CDG 6,99 € `div.kz4wo41z4 > ul > li > a.gk14de1`
Lyon 11,99 € `div.kz4wo41z4 > ul > li > a.gk14de1`
Metz 9,99 € `div.kz4wo41z4 > ul > li > a.gk14de1`
Bruxelles 9,99 € `div.kz4wo41z4 > ul > li > a.gk14de1`
Genève 22,99 € `div.kz4wo41z4 > ul > li > a.gk14de1`

○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

●Buttons have an accessible name

●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.

●`button`, `link`, and `menuitem` elements have accessible names

●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

●Background and foreground colors have a sufficient contrast ratio

●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.

●Links have a discernible name

●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.

●`[lang]` attributes have a valid value

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●All heading elements contain content.

●Uses ARIA roles only on compatible elements

○`[accesskey]` values are unique

○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.

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○Image elements do not have `[alt]` attributes that are redundant text.

○Identical links have the same purpose.

○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.

100

Best Practices

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●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

○Use a strong HSTS policy

○Mitigate clickjacking with XFO or CSP

100

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.

○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

●Links are crawlable

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

○robots.txt is valid