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Lighthouse Mobile

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

Audit breakdown by category with detailed findings.

39

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
img.youtube.com/vi/3LYsn03uyL8/maxresdefault.jpg7200.0 s63.4 KiB
assets.lulu.com/media/fonts/MuseoSans/woff2/MuseoSans_300.woff23600.0 s19.8 KiB
assets.lulu.com/media/fonts/MuseoSans/woff2/MuseoSans_500.woff23600.0 s19.7 KiB
assets.lulu.com/media/fonts/MuseoSans/woff2/MuseoSans_700.woff23600.0 s19.3 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.

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
www.lulu.com/_next/static/media/icons.8cb6f880.woff250 ms

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
A variety of paperback and hardcover self published books authors have made on … div > section.MainBanner-module_mainBannerWrapper__QQZHx > picture > img.ImageWithMetadata-module_metadataImage__VCVHc
/9htf9uzhsn4z/5BznDPBoNfwTNzGOGNwH65/2afa6cb0ada5b1d1fad1...71.1 KiB60.2 KiB
Video thumbnail div.NewElementCard-module_imageAndVideoWrapper__v5gBa > div.Video-module_videoContainer__Fbe0e > button.NakedButton-module_nakedButton__TWA3I > img
img.youtube.com/vi/3LYsn03uyL8/maxresdefault.jpg63.0 KiB59.7 KiB
Testimonial image of Lulu Direct customer Katie Cross from Katie Cross Books div.NewElementCard-module_elementCard__OciVn > div.NewElementCard-module_imageAndVideoWrapper__v5gBa > picture > img.ImageWithMetadata-module_metadataImage__VCVHc
/9htf9uzhsn4z/6eIZHqMZrwqjNVTzleiqSV/ed97b73a6b6b08a19502...39.6 KiB35.5 KiB
Activate Good affiliate logo div.grid-12 > div.col-1 > picture > img.ImageWithMetadata-module_metadataImage__VCVHc
/9htf9uzhsn4z/fAxp6xfRpyErQevsyQwUS/583c6091556e8b299c289...30.6 KiB29.5 KiB
Non-Fiction Authors Association affiliate logo div.grid-12 > div.col-1 > picture > img.ImageWithMetadata-module_metadataImage__VCVHc
/9htf9uzhsn4z/78CPjUuDlqTCrRN8eJK5Ch/8083a6d5d865ef0c49ce...20.2 KiB19.5 KiB
Independent Book Publishers Association affiliate logo div.grid-12 > div.col-1 > picture > img.ImageWithMetadata-module_metadataImage__VCVHc
/9htf9uzhsn4z/GV5zGpRr0WlIXGBPXKQmY/c0f0b30223b5c1d295674...14.9 KiB14.4 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: A variety of paperback and hardcover self published books authors have made on …
path: 1,HTML,1,BODY,0,DIV,1,DIV,1,MAIN,0,DIV,0,SECTION,0,PICTURE,2,IMG
selector: div > section.MainBanner-module_mainBannerWrapper__QQZHx > picture > img.ImageWithMetadata-module_metadataImage__VCVHc
snippet: <img srcset="https://images.ctfassets.net/9htf9uzhsn4z/2PtX9tp1DcPx4452zfwonm/f1ef9d067…" src="https://images.ctfassets.net/9htf9uzhsn4z/5BznDPBoNfwTNzGOGNwH65/2afa6cb0a…" alt="A variety of paperback and hardcover self published books authors have mad…" class="ImageWithMetadata-module_metadataImage__VCVHc" fetchpriority="auto">

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

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

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: 760 ms
URLTime Spent
lulu.com/760 ms
www.lulu.com/0.0 ms

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

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: 4.8 s 900.5 KiB
URLTransfer SizeEst Savings
www.lulu.com/_next/static/css/8891f4173d423714.css905.9 KiB900.5 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: 900 ms 187.7 KiB
URLTransfer SizeEst Savings
www.lulu.com/_next/static/chunks/pages/_app-0a96cd61aa379a7b.js524.4 KiB187.7 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
Unattributable861 ms33 ms0.0 ms
www.lulu.com/_next/static/chunks/framework-9c77ee99132d6bfd.js717 ms647 ms14 ms
www.lulu.com/_next/static/chunks/pages/_app-0a96cd61aa379a7b.js611 ms387 ms207 ms
www.lulu.com/551 ms8.3 ms1.7 ms
www.lulu.com/_next/static/css/8891f4173d423714.css282 ms0.0 ms0.0 ms
www.lulu.com/_next/static/chunks/main-af44a5115117342d.js99 ms78 ms17 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 Evaluation1.2 s
Other912 ms
Style & Layout499 ms
Parse HTML & CSS277 ms
Script Parsing & Compilation249 ms
Rendering42 ms
Garbage Collection16 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
Video thumbnail div.NewElementCard-module_imageAndVideoWrapper__v5gBa > div.Video-module_videoContainer__Fbe0e > button.NakedButton-module_nakedButton__TWA3I > img
img.youtube.com/vi/3LYsn03uyL8/maxresdefault.jpg
Self-publish a book with Lulu’s easy-to-use tools and global print-on-demand ne… div.NewElementCard-module_elementCard__OciVn > div.NewElementCard-module_imageAndVideoWrapper__v5gBa > picture > img.ImageWithMetadata-module_metadataImage__VCVHc
/9htf9uzhsn4z/1cnaUlra2d6lNp0hecAksg/fb702f7d83dbf7972292...
Integrate and sell on Shopify, WooCommerce, Wix, and the free book printing API div.NewElementCard-module_elementCard__OciVn > div.NewElementCard-module_imageAndVideoWrapper__v5gBa > picture > img.ImageWithMetadata-module_metadataImage__VCVHc
/9htf9uzhsn4z/4PJUjNW2CwBzqvveO75w3/db1d2d6f67ac03dc77beb...
Sell on Amazon, the Lulu Bookstore, and to over 40,000 retailers and schools th… div.NewElementCard-module_elementCard__OciVn > div.NewElementCard-module_imageAndVideoWrapper__v5gBa > picture > img.ImageWithMetadata-module_metadataImage__VCVHc
/9htf9uzhsn4z/5nKtFXNczxeqlcyLQZPajp/1aa9112fdd4200dabc22...
Integration for the free RESTful book print on demand API div.NewElementCard-module_elementCard__OciVn > div.NewElementCard-module_imageAndVideoWrapper__v5gBa > picture > img.ImageWithMetadata-module_metadataImage__VCVHc
/9htf9uzhsn4z/2JKzcBsyqVQXpLGTQ84mJz/09946246c8bc01ec135c...
Lulu Logo div.MainNavigation_left__KhEGS > div.MainNavigation_navigationItem__BF3AE > a.MainNavigation_logo__0BOee > img
/9htf9uzhsn4z/3tSSOSmHDmAKXuhUbZD27g/9f3a594a7c169dec01ae...
Testimonial image of Lulu Direct customer Katie Cross from Katie Cross Books div.NewElementCard-module_elementCard__OciVn > div.NewElementCard-module_imageAndVideoWrapper__v5gBa > picture > img.ImageWithMetadata-module_metadataImage__VCVHc
/9htf9uzhsn4z/6eIZHqMZrwqjNVTzleiqSV/ed97b73a6b6b08a19502...
Testimonial image of Lulu API customer Marc Pittet of Mustachian Post div.NewElementCard-module_elementCard__OciVn > div.NewElementCard-module_imageAndVideoWrapper__v5gBa > picture > img.ImageWithMetadata-module_metadataImage__VCVHc
/9htf9uzhsn4z/2p6aLt7PLeGFtMfp8eiYrt/5b0f7c18c8356c372a00...

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

●Layout shift culprits
●Optimize DOM size
●Forced reflow
●LCP breakdown
●Modern HTTP
●Render blocking requests
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●Avoids enormous network payloads Total size was 2,324 KiB
●User Timing marks and measures 4 user timings
●Avoid long main-thread tasks 8 long tasks found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 20 ms
●Server Backend Latencies 90 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 30 ms
○INP breakdown
○Avoid non-composited animations
○Avoid large layout shifts
98

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
Authors & Creators div.NewElementCard-module_elementCard__OciVn > section.res-horizontal-padding-16 > div.RichTextContainer-module_richTextContainer__Hdr3- > h3.typo-brand-heading-h3
“Working with Lulu was a game-changer for my company! They integrate so smoothl… div.NewElementCard-module_elementCard__OciVn > section > div.RichTextContainer-module_richTextContainer__Hdr3- > h4.typo-brand-heading-h4
“Before switching to the Lulu API, I was spending 1–3 minutes per order manuall… div.NewElementCard-module_elementCard__OciVn > section > div.RichTextContainer-module_richTextContainer__Hdr3- > h4.typo-brand-heading-h4

These are opportunities to improve keyboard navigation in your application.

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
Authors & Creators Publish, print, and sell professional-quality custom books … div.Grid-module_wrapperWithBgColor__I5JS8 > div.grid-12 > div.col-3 > a.NewElementCard-module_asLink__cQJKF
Entrepreneurs & Startups Build your brand and monetize your audience with ecom… div.Grid-module_wrapperWithBgColor__I5JS8 > div.grid-12 > div.col-3 > a.NewElementCard-module_asLink__cQJKF
Businesses & Brands API-enabled integrations for book printing and fulfillment… div.Grid-module_wrapperWithBgColor__I5JS8 > div.grid-12 > div.col-3 > a.NewElementCard-module_asLink__cQJKF
Enterprise Publishers Scaling print and fulfillment solutions for direct-to-co… div.Grid-module_wrapperWithBgColor__I5JS8 > div.grid-12 > div.col-3 > a.NewElementCard-module_asLink__cQJKF
○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.
●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
●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
○`[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.
○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.
○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.
100

Best Practices

General

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.

URLMap URL
www.lulu.com/_next/static/chunks/pages/_app-0a96cd61aa379a7b.jswww.lulu.com/_next/static/chunks/pages/_app-0a96cd61aa379a7b.js.map
www.lulu.com/_next/static/chunks/webpack-553394d1d865875a.jswww.lulu.com/_next/static/chunks/webpack-553394d1d865875a.js.map
www.lulu.com/_next/static/chunks/pages/index-cde1be032b462290.jswww.lulu.com/_next/static/chunks/pages/index-cde1be032b462290.js.map
www.lulu.com/_next/static/chunks/pages/cart-ae8f3150c4cedb98.jswww.lulu.com/_next/static/chunks/pages/cart-ae8f3150c4cedb98.js.map
www.lulu.com/_next/static/chunks/main-af44a5115117342d.jswww.lulu.com/_next/static/chunks/main-af44a5115117342d.js.map
www.lulu.com/_next/static/chunks/framework-9c77ee99132d6bfd.jswww.lulu.com/_next/static/chunks/framework-9c77ee99132d6bfd.js.map
www.lulu.com/_next/static/chunks/514.fddcc21ef935af8d.jswww.lulu.com/_next/static/chunks/514.fddcc21ef935af8d.js.map
●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
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate clickjacking with XFO or CSP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
○Redirects HTTP traffic to HTTPS
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`

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