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
static.snapchat.com/videos/snapchat-dot-com/posters/lens.png	0.0 ms	471.8 KiB
static.snapchat.com/videos/snapchat-dot-com/find-your-friends.mp4	0.0 ms	375.3 KiB
static.snapchat.com/videos/snapchat-dot-com/posters/map.png	0.0 ms	365.0 KiB
static.snapchat.com/videos/snapchat-dot-com/posters/find-your-friends.png	0.0 ms	294.3 KiB
static.snapchat.com/videos/snapchat-dot-com/posters/spotlight.png	0.0 ms	278.3 KiB
static.snapchat.com/images/snapchatdotcom/Homepage+Bitmojis.png	0.0 ms	77.8 KiB

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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
div.HomepageContent_videoSlidesContainer__RYMzP > div.VideoSlides_videoSlide__F3y7i > div.VideoSlides_videoWrapper__FY7c_ > video.VideoSlides_videoSlideVideo__66B_g `div.HomepageContent_videoSlidesContainer__RYMzP > div.VideoSlides_videoSlide__F3y7i > div.VideoSlides_videoWrapper__FY7c_ > video.VideoSlides_videoSlideVideo__66B_g`	static.snapchat.com/videos/snapchat-dot-com/posters/lens.png	471.4 KiB	435.8 KiB
div.HomepageContent_videoSlidesContainer__RYMzP > div.VideoSlides_videoSlide__F3y7i > div.VideoSlides_videoWrapper__FY7c_ > video.VideoSlides_videoSlideVideo__66B_g `div.HomepageContent_videoSlidesContainer__RYMzP > div.VideoSlides_videoSlide__F3y7i > div.VideoSlides_videoWrapper__FY7c_ > video.VideoSlides_videoSlideVideo__66B_g`	static.snapchat.com/videos/snapchat-dot-com/posters/map.png	364.6 KiB	328.6 KiB
div.HomepageContent_videoSlidesContainer__RYMzP > div.VideoSlides_videoSlide__F3y7i > div.VideoSlides_videoWrapper__FY7c_ > video.VideoSlides_videoSlideVideo__66B_g `div.HomepageContent_videoSlidesContainer__RYMzP > div.VideoSlides_videoSlide__F3y7i > div.VideoSlides_videoWrapper__FY7c_ > video.VideoSlides_videoSlideVideo__66B_g`	static.snapchat.com/videos/snapchat-dot-com/posters/spotlight.png	277.9 KiB	242.0 KiB
bitmojis `div.HomepageContent_homepage__bj0Ud > div.HomepageContent_scrollContainer__JeZpi > div.HomepageContent_videoSlidesContainer__RYMzP > img.HomepageContent_bitmojiImg__74_Ok`	static.snapchat.com/images/snapchatdotcom/Homepage+Bitmojis.png	77.5 KiB	73.1 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-4-VIDEO

nodeLabel: div.HomepageContent_videoSlidesContainer__RYMzP > div.VideoSlides_videoSlide__F3y7i > div.VideoSlides_videoWrapper__FY7c_ > video.VideoSlides_videoSlideVideo__66B_g

path: 3,DIV,1,DIV,1,DIV,1,DIV,1,DIV,0,VIDEO

selector: div.HomepageContent_videoSlidesContainer__RYMzP > div.VideoSlides_videoSlide__F3y7i > div.VideoSlides_videoWrapper__FY7c_ > video.VideoSlides_videoSlideVideo__66B_g

snippet: <video data-video-index="0" playsinline="" autoplay="" muted="" loop="" poster="https://static.snapchat.com/videos/snapchat-dot-com/posters/find-your-frie…" class="VideoSlides_videoSlideVideo__66B_g" src="https://static.snapchat.com/videos/snapchat-dot-com/find-your-friends.mp4">

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

value: no origins were preconnected

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

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: 803 ms

URL	Time Spent
snapchat.com/	803 ms
www.snapchat.com/	0.0 ms

Diagnostics

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: 310 ms 23.7 KiB

URL	Transfer Size	Est Savings
static.snapchat.com/snapchat-dot-com/_next/static/css/d8c67cbd57df6f4b.css	26.1 KiB	23.7 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: 160 ms 6.9 MiB

URL	Transfer Size	Est Savings
/snapchat-dot-com/_next/static/chunks/pages/_app-5bf94840...	9.3 MiB	6.9 MiB
/snapchat-dot-com/_next/static/chunks/main-93dbaebda72da0...	50.0 KiB	26.6 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
/snapchat-dot-com/_next/static/chunks/pages/_app-5bf94840...	2.3 s	1.3 s	963 ms
/snapchat-dot-com/_next/static/chunks/framework-41b02394b...	970 ms	915 ms	19 ms
www.snapchat.com/	579 ms	5.5 ms	0.6 ms
Unattributable	416 ms	56 ms	0.0 ms
/snapchat-dot-com/_next/static/chunks/main-93dbaebda72da0...	75 ms	56 ms	16 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	2.4 s
Script Parsing & Compilation	1.0 s
Other	540 ms
Style & Layout	377 ms
Rendering	57 ms
Parse HTML & CSS	48 ms
Garbage Collection	19 ms

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.

URL	Transfer Size
/snapchat-dot-com/_next/static/chunks/pages/_app-5bf94840...	9.6 MiB
static.snapchat.com/videos/snapchat-dot-com/posters/lens.png	471.8 KiB
static.snapchat.com/videos/snapchat-dot-com/find-your-friends.mp4	375.3 KiB
static.snapchat.com/videos/snapchat-dot-com/posters/map.png	365.0 KiB
static.snapchat.com/videos/snapchat-dot-com/posters/find-your-friends.png	294.3 KiB
static.snapchat.com/videos/snapchat-dot-com/posters/spotlight.png	278.3 KiB
static.snapchat.com/images/snapchatdotcom/Homepage+Bitmojis.png	77.8 KiB
static.snapchat.com/fonts/AvenirNext-Bold.woff2	63.3 KiB
static.snapchat.com/fonts/AvenirNext-DemiBold.woff2	58.8 KiB
static.snapchat.com/fonts/AvenirNext-Medium.woff2	58.7 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
bitmojis `div.HomepageContent_homepage__bj0Ud > div.HomepageContent_scrollContainer__JeZpi > div.HomepageContent_videoSlidesContainer__RYMzP > img.HomepageContent_bitmojiImg__74_Ok`	static.snapchat.com/images/snapchatdotcom/Homepage+Bitmojis.png

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

●Layout shift culprits

●Optimize DOM size

●Font display

●Forced reflow

●LCP breakdown

●Modern HTTP

●Render blocking requests

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●User Timing marks and measures 4 user timings

●Avoid long main-thread tasks 5 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 20 ms

●Server Backend Latencies 200 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

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

●Avoid large layout shifts 3 layout shifts found

○INP breakdown

○Avoid non-composited animations

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.

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
Discover Snapchat `div.HomepageContent_scrollContainer__JeZpi > div.HomepageContent_landingScreen__NdJhc > div.HomepageContent_discoverSnapchatContainer__CARas > h6.HomepageContent_discoverSnapchatText__sRIq4`
Advertisers `div.HomepageContent_scrollContainer__JeZpi > div.HomepageContent_openYourSnapchatScreen__yfAAX > a.HomepageContent_openYourSnapchatCTALink__YhpLj > h3.Heading_h300__OlOwD`

These are opportunities to improve keyboard navigation in your application.

Best practices

Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more about the viewport meta tag.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
head > meta `head > meta`

These items highlight common accessibility best practices.

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
Lenses `nav.MobileBottomNav_bottomNav__JMe_5 > ul.MobileBottomNav_bottomLinkList__e_Se1 > li.MobileBottomNav_bottomItem__wbIaw > a.MobileBottomNavItem_link__Xxwu0`
Stories `nav.MobileBottomNav_bottomNav__JMe_5 > ul.MobileBottomNav_bottomLinkList__e_Se1 > li.MobileBottomNav_bottomItem__wbIaw > a.MobileBottomNavItem_link__Xxwu0`

○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

●ARIA attributes are used as specified for the element's role

●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 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

●Touch targets have sufficient size and spacing.

●Document has a main landmark.

●Deprecated ARIA roles were not used

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

○`[accesskey]` values are unique

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

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○`[aria-hidden="true"]` elements do not contain focusable descendents

○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

○Links are distinguishable without relying on color.

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○No element has a `[tabindex]` value greater than 0

○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

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

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○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.

Best Practices

General

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.

Source	Description
www.snapchat.com/	`Access to fetch at 'https://growth-web-dev-tool.mesh.sc-corp.net/api/open-sesame' from origin 'https://www.snapchat.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.`
growth-web-dev-tool.mesh.sc-corp.net/api/open-sesame	`Failed to load resource: net::ERR_FAILED`
growth-web-dev-tool.mesh.sc-corp.net/api/open-sesame	`Failed to load resource: the server responded with a status of 403 ()`
/snapchat-dot-com/_next/static/chunks/framework-41b02394b...	`Uncaught Error: Minified React error #418; visit https://reactjs.org/docs/error-decoder.html?invariant=418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings.`
/snapchat-dot-com/_next/static/chunks/framework-41b02394b...	`Uncaught Error: Minified React error #418; visit https://reactjs.org/docs/error-decoder.html?invariant=418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings.`
/snapchat-dot-com/_next/static/chunks/framework-41b02394b...	`Uncaught Error: Minified React error #422; visit https://reactjs.org/docs/error-decoder.html?invariant=422 for the full message or use the non-minified dev environment for full errors and additional helpful warnings.`
/snapchat-dot-com/_next/static/chunks/framework-41b02394b...	`Uncaught Error: Minified React error #425; visit https://reactjs.org/docs/error-decoder.html?invariant=425 for the full message or use the non-minified dev environment for full errors and additional helpful warnings.`

Issues logged to the `Issues` panel in Chrome Devtools indicate unresolved problems. They can come from network request failures, insufficient security controls, and other browser concerns. Open up the Issues panel in Chrome DevTools for more details on each issue.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Issue type
Content security policy

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Map URL
/snapchat-dot-com/_next/static/chunks/pages/_app-5bf94840...	/snapchat-dot-com/_next/static/chunks/pages/_app-5bf94840...
/snapchat-dot-com/_next/static/chunks/webpack-f93875dec9c...	/snapchat-dot-com/_next/static/chunks/webpack-f93875dec9c...
/snapchat-dot-com/_next/static/chunks/pages/index-724fcfb...	/snapchat-dot-com/_next/static/chunks/pages/index-724fcfb...
/snapchat-dot-com/_next/static/chunks/main-93dbaebda72da0...	/snapchat-dot-com/_next/static/chunks/main-93dbaebda72da0...
/snapchat-dot-com/_next/static/chunks/framework-41b02394b...	/snapchat-dot-com/_next/static/chunks/framework-41b02394b...
/snapchat-dot-com/_next/static/chunks/6018-cd60d20fa93793...	/snapchat-dot-com/_next/static/chunks/6018-cd60d20fa93793...
/snapchat-dot-com/_next/static/chunks/1540-d9fffe24ab4144...	/snapchat-dot-com/_next/static/chunks/1540-d9fffe24ab4144...

●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

●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

○Redirects HTTP traffic to HTTPS

○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

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`