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
/HYx10rg3/captcha/captcha.js?a=c&u=17e841f0-39bf-11f1-83e...	600.0 s	264.0 KiB
crcldu.com/bd/auditor.js?v=1776362760000	120.0 s	117.7 KiB
www.zillow.com/HYx10rg3/init.js	600.0 s	99.1 KiB
connect.facebook.net/en_US/fbevents.js	1200.0 s	96.4 KiB
www.zillowstatic.com/s3/pfs/vendors~productnavApp-f5e5d55e814da72b2063.js	86400.0 s	212.3 KiB
client.px-cloud.net/PXHYx10rg3/main.min.js	600.0 s	89.7 KiB
www.zillowstatic.com/s3/pfs/vendors~regApp-f54cf63c9480f03326e9.js	86400.0 s	174.0 KiB
cdn.pubnub.com/sdk/javascript/pubnub.7.5.0.min.js	0.0 ms	57.5 KiB
/s3/pfs/vendors~productnavApp~regApp~topnavApp-ddac4c5c25...	86400.0 s	101.8 KiB
/signals/config/547145892064117?v=2.9.298&r=stable&domain...	1200.0 s	44.7 KiB
www.datadoghq-browser-agent.com/us1/v5/datadog-rum.js	14400.0 s	51.9 KiB
/consent/7e84c9ce-057e-4c91-87ef-56e6d4914637/a84e7f07-b7...	0.0 ms	33.7 KiB
www.zillowstatic.com/s3/pfs/vendors~topnavApp-0b53e4771e62e3a6d606.js	86400.0 s	73.3 KiB
scripts.clarity.ms/0.8.59/clarity.js	0.0 ms	26.1 KiB
cdn.zg-api.com/a/z/js/v1/analytics.js?v=bcf290c	86400.0 s	58.6 KiB
www.redditstatic.com/ads/pixel.js	60.0 s	19.0 KiB
www.google-analytics.com/analytics.js	7200.0 s	20.9 KiB
p.teads.tv/teads-fellow.js	506.0 s	14.8 KiB
js.adsrvr.org/up_loader.1.1.0.js	0.0 ms	12.2 KiB
www.zillowstatic.com/s3/pfs/vendors~regApp~topnavApp-134d2a08962787337c83.js	86400.0 s	19.0 KiB
/s3/pfs/vendors~productnavApp~topnavApp-a10deedb823253ffc...	86400.0 s	15.4 KiB
www.zillowstatic.com/s3/pfs/vendors~productnavApp~regApp-6314e4dcb9ad34c96938.js	86400.0 s	13.7 KiB
www.zillowstatic.com/s3/pfs/core-df6712a376e88526fe76.js	86400.0 s	13.0 KiB
sb.scorecardresearch.com/internal-cs/default/beacon-and.js	86400.0 s	7.8 KiB
ct.pinterest.com/static/ct/token_create.js	7200.0 s	3.9 KiB
s.pinimg.com/ct/lib/main.10d2511a.js	1209600.0 s	27.4 KiB
www.zillowstatic.com/s3/pfs/topnavApp-24bd8926397103d1885e.js	86400.0 s	4.0 KiB
s.pinimg.com/ct/core.js	7200.0 s	2.1 KiB
www.zillowstatic.com/s3/pfs/static/app-store-badge.svg	86400.0 s	3.0 KiB
js.adsrvr.org/universal_pixel.js	0.0 ms	959 B
www.zillowstatic.com/s3/pfs/static/google-play-badge.svg	86400.0 s	2.1 KiB
www.zillowstatic.com/s3/pfs/static/z-logo-default-visual-refresh.svg	86400.0 s	1.7 KiB
www.zillowstatic.com/s3/pfs/static/z-logo-white-visual-refresh.svg	86400.0 s	1.7 KiB
/rp.gif?ts=1776362835814&id=a2_eb6hulyj70r7&event=PageVis...	0.0 ms	666 B
/config/com/efd79a2e-954c-4330-a6c2-56493f31ff29.js?v=3.5...	0.0 ms	472 B
www.zillowstatic.com/s3/pfs/productnavApp-b07ebee2d7cadc4614c7.js	86400.0 s	872 B
www.zillowstatic.com/s3/pfs/datagrailBannerApp-cd67de4e65d9398df32d.js	86400.0 s	797 B
www.zillowstatic.com/s3/pfs/regApp-36b5af0199595a45a339.js	86400.0 s	749 B
/pixel/?ad_log=referer&action=content&pixid=0f389214-0569...	0.0 ms	131 B
/tr/?id=547145892064117&ev=PageView&zscript=1&dl=https://...	0.0 ms	19 B
/tr/?id=547145892064117&ev=AddPaymentInfo&dl=https%3A%2F%...	0.0 ms	16 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:0.000589] map[node:map[boundingRect:map[bottom:157 height:80 left:24 right:388 top:77 width:364] lhId:page-1-H1 nodeLabel:Rentals. Homes. Agents. Loans. path:1,HTML,1,BODY,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,H1 selector:div.StyledBox-c11n-8-111-2__sc-ocjv7k-0 > div.StyledBox-c11n-8-111-2__sc-ocjv7k-0 > div.StyledBox-c11n-8-111-2__sc-ocjv7k-0 > h1.Text-c11n-8-111-2__sc-aiai24-0 snippet:<h1 class="Text-c11n-8-111-2__sc-aiai24-0 StyledHeading-c11n-8-111-2__sc-s7fcif-0 jlp…"> type:node] score:0.000589]]

items: [map[node:map[type:text value:Total] score:0.13853] map[node:map[boundingRect:map[bottom:823 height:340 left:0 right:412 top:483 width:412] lhId:page-0-DIV nodeLabel:Before we continue... Press & Hold to confirm you are a human (and not a bot). … path:1,HTML,1,BODY,2,DIV,1,DIV selector:body > div#px-captcha-wrapper > div.px-captcha-container snippet:<div class="px-captcha-container"> type:node] score:0.089693] map[node:map[boundingRect:map[bottom:823 height:340 left:0 right:412 top:483 width:412] lhId:page-0-DIV nodeLabel:Before we continue... Press & Hold to confirm you are a human (and not a bot). … path:1,HTML,1,BODY,2,DIV,1,DIV selector:body > div#px-captcha-wrapper > div.px-captcha-container snippet:<div class="px-captcha-container"> type:node] score:0.022426] map[node:map[boundingRect:map[bottom:823 height:340 left:0 right:412 top:483 width:412] lhId:page-0-DIV nodeLabel:Before we continue... Press & Hold to confirm you are a human (and not a bot). … path:1,HTML,1,BODY,2,DIV,1,DIV selector:body > div#px-captcha-wrapper > div.px-captcha-container snippet:<div class="px-captcha-container"> type:node] score:0.01289] map[node:map[boundingRect:map[bottom:974 height:198 left:24 right:388 top:776 width:364] lhId:page-2-DIV nodeLabel:Find homes you can afford with BuyAbility℠ Answer a few questions. We'll highli… path:1,HTML,1,BODY,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,1,DIV selector:div > div.StyledBox-c11n-8-111-2__sc-ocjv7k-0 > div.Flex-c11n-8-111-2__sc-n94bjd-0 > div snippet:<div> type:node] score:0.007807] map[node:map[boundingRect:map[bottom:823 height:340 left:0 right:412 top:483 width:412] lhId:page-0-DIV nodeLabel:Before we continue... Press & Hold to confirm you are a human (and not a bot). … path:1,HTML,1,BODY,2,DIV,1,DIV selector:body > div#px-captcha-wrapper > div.px-captcha-container snippet:<div class="px-captcha-container"> type:node] score:0.003643 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2]]] type:subitems]]]

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:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:36.676 source:map[column:137982 line:1 type:source-location url:https://www.zillowstatic.com/s3/shopper-platform/_next/static/chunks/framework-dc1d49c026dc2558.js urlProvider:network]]]

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:69.202 source:map[type:text value:[unattributed]]] map[reflowTime:36.676 source:map[column:5167 line:0 type:source-location url:https://www.zillowstatic.com/s3/web-platform/sub-apps/hops-homepage/hops-homepage.prod.master.13939300.467acb3c/web/444.5a6838f7.bundle.js urlProvider:network]] map[reflowTime:0.466 source:map[column:272950 line:1 type:source-location url:https://www.zillow.com/HYx10rg3/captcha/captcha.js?a=c&u=17e841f0-39bf-11f1-83e2-4d04e1cc3d07&v=17f76f2c-39bf-11f1-a5fd-53e8e194cf14&m=0&b=aHR0cHM6Ly93d3cuemlsbG93LmNvbS9ncmFwaHFs&h=UE9TVA== urlProvider:network]] map[reflowTime:3.593 source:map[column:289531 line:0 type:source-location url:https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js urlProvider:network]] map[reflowTime:0.167 source:map[column:193632 line:1 type:source-location url:https://client.px-cloud.net/PXHYx10rg3/main.min.js urlProvider:network]] map[reflowTime:0.834 source:map[column:45604 line:1 type:source-location url:https://sc-static.net/scevent.min.js urlProvider:network]] map[reflowTime:20.688 source:map[column:31518 line:1 type:source-location url:https://scripts.clarity.ms/0.8.59/clarity.js urlProvider:network]] map[reflowTime:15.134 source:map[column:172575 line:1 type:source-location url:https://client.px-cloud.net/PXHYx10rg3/main.min.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.

	URL	Resource Size	Est Savings
div > div > picture > img.StyledBox-c11n-8-111-2__sc-ocjv7k-0 `div > div > picture > img.StyledBox-c11n-8-111-2__sc-ocjv7k-0`	www.zillowstatic.com/bedrock/app/uploads/sites/5/2024/07/image2-m%402x.jpg	242.9 KiB	168.5 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: div > div > picture > img.StyledBox-c11n-8-111-2__sc-ocjv7k-0

path: 1,HTML,1,BODY,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,PICTURE,8,IMG

selector: div > div > picture > img.StyledBox-c11n-8-111-2__sc-ocjv7k-0

snippet: <img alt="" role="presentation" src="https://www.zillowstatic.com/bedrock/app/uploads/sites/5/2024/07/image2-m%…" class="StyledBox-c11n-8-111-2__sc-ocjv7k-0 dvqAWH">

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.

More than 4 preconnect connections were found. These should be used sparingly and only to the most important origins.

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
fonts.googleapis.com/css?family=Open+Sans:400,600,700&display=swap	2.2 KiB	776 ms

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.

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: 765 ms

URL	Time Spent
zillow.com/	765 ms
www.zillow.com/	0.0 ms

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: 3.7 s 1.7 MiB

URL	Transfer Size	Est Savings
/s3/web-platform/sub-apps/buyability-sub-app/buyability-s...	199.4 KiB	156.6 KiB
www.zillowstatic.com/s3/pfs/vendors~productnavApp-f5e5d55e814da72b2063.js	211.8 KiB	153.8 KiB
/s3/web-platform/sub-apps/hops-homepage/hops-homepage.pro...	226.0 KiB	141.8 KiB
www.zillowstatic.com/s3/pfs/vendors~regApp-f54cf63c9480f03326e9.js	173.5 KiB	105.1 KiB
accounts.google.com/gsi/client	95.3 KiB	71.0 KiB
/s3/web-platform/sub-apps/hops-homepage/hops-homepage.pro...	139.4 KiB	58.4 KiB
www.googletagmanager.com/gtag/js?id=DC-4704202&cx=c&gtm=4e64f0&bs=ctrl2	129.2 KiB	57.1 KiB
www.googletagmanager.com/gtag/js?id=AW-945306123&cx=c&gtm=4e64f0&bs=ctrl2	146.3 KiB	56.1 KiB
www.googletagmanager.com/gtag/js?id=AW-1000940809&cx=c&gtm=4e64f0&bs=ctrl2	145.4 KiB	56.0 KiB
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js	109.0 KiB	55.6 KiB
www.googletagmanager.com/gtag/js?id=AW-940416625&cx=c&gtm=4e64f0&bs=ctrl2	137.3 KiB	54.5 KiB
www.googletagmanager.com/gtag/js?id=AW-967411044&cx=c&gtm=4e64f0&bs=ctrl2	137.6 KiB	53.9 KiB
www.googletagmanager.com/gtag/js?id=AW-946526103&cx=c&gtm=4e64f0&bs=ctrl2	144.7 KiB	53.7 KiB
/s3/web-platform/sub-apps/hops-homepage/hops-homepage.pro...	107.9 KiB	51.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-P6HT97	214.1 KiB	50.4 KiB
/HYx10rg3/captcha/captcha.js?a=c&u=17e841f0-39bf-11f1-83e...	260.8 KiB	45.9 KiB
cdn.pubnub.com/sdk/javascript/pubnub.7.5.0.min.js	56.7 KiB	45.8 KiB
/s3/shopper-platform/_next/static/chunks/main-537631fad5e...	96.0 KiB	45.5 KiB
/s3/web-platform/sub-apps/buyability-sub-app/buyability-s...	85.5 KiB	42.6 KiB
/s3/pfs/vendors~productnavApp~regApp~topnavApp-ddac4c5c25...	101.3 KiB	41.8 KiB
www.zillowstatic.com/s3/pfs/vendors~topnavApp-0b53e4771e62e3a6d606.js	72.8 KiB	41.2 KiB
/s3/web-platform/sub-apps/buyability-sub-app/buyability-s...	47.8 KiB	38.4 KiB
/s3/web-platform/sub-apps/buyability-sub-app/buyability-s...	38.3 KiB	38.0 KiB
connect.facebook.net/en_US/fbevents.js	96.3 KiB	36.5 KiB
/s3/web-platform/sub-apps/search-box-sub-app/search-box-s...	57.7 KiB	35.9 KiB
www.zillow.com/HYx10rg3/init.js	98.5 KiB	35.9 KiB
/s3/web-platform/sub-apps/buyability-sub-app/buyability-s...	165.2 KiB	34.5 KiB
/s3/shopper-platform/_next/static/chunks/pages/_app-74514...	55.4 KiB	33.0 KiB
client.px-cloud.net/PXHYx10rg3/main.min.js	89.3 KiB	27.2 KiB
/s3/web-platform/sub-apps/hops-homepage/hops-homepage.pro...	37.8 KiB	26.0 KiB
/s3/web-platform/sub-apps/buyability-sub-app/buyability-s...	32.1 KiB	24.1 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.

URL	Total CPU Time	Script Evaluation	Script Parse
client.px-cloud.net/PXHYx10rg3/main.min.js	5.4 s	3.4 s	26 ms
Unattributable	2.4 s	520 ms	0.0 ms
/s3/shopper-platform/_next/static/chunks/framework-dc1d49...	2.2 s	1.7 s	18 ms
/HYx10rg3/captcha/captcha.js?a=c&u=17e841f0-39bf-11f1-83e...	1.5 s	1.3 s	67 ms
www.zillow.com/	1.3 s	67 ms	18 ms
www.googletagmanager.com/gtm.js?id=GTM-P6HT97	1.2 s	1.1 s	115 ms
/s3/shopper-platform/_next/static/chunks/pages/_app-74514...	932 ms	701 ms	25 ms
/s3/web-platform/sub-apps/buyability-sub-app/buyability-s...	907 ms	801 ms	102 ms
/s3/web-platform/sub-apps/hops-homepage/hops-homepage.pro...	661 ms	471 ms	189 ms
www.datadoghq-browser-agent.com/us1/v5/datadog-rum.js	593 ms	386 ms	25 ms
/s3/web-platform/sub-apps/hops-homepage/hops-homepage.pro...	523 ms	434 ms	58 ms
www.googletagmanager.com/gtag/js?id=AW-946526103&cx=c&gtm=4e64f0&bs=ctrl2	493 ms	330 ms	68 ms
www.googletagmanager.com/gtag/js?id=AW-945306123&cx=c&gtm=4e64f0&bs=ctrl2	488 ms	434 ms	48 ms
www.zillowstatic.com/s3/pfs/vendors~topnavApp-0b53e4771e62e3a6d606.js	453 ms	403 ms	43 ms
www.zillowstatic.com/s3/pfs/vendors~productnavApp-f5e5d55e814da72b2063.js	447 ms	301 ms	145 ms
www.zillowstatic.com/s3/pfs/vendors~regApp-f54cf63c9480f03326e9.js	383 ms	277 ms	106 ms
www.googletagmanager.com/gtag/js?id=DC-4704202&cx=c&gtm=4e64f0&bs=ctrl2	370 ms	321 ms	44 ms
www.googletagmanager.com/gtag/js?id=AW-1000940809&cx=c&gtm=4e64f0&bs=ctrl2	344 ms	288 ms	52 ms
www.googletagmanager.com/gtag/js?id=AW-967411044&cx=c&gtm=4e64f0&bs=ctrl2	321 ms	272 ms	46 ms
www.googletagmanager.com/gtag/js?id=AW-940416625&cx=c&gtm=4e64f0&bs=ctrl2	304 ms	254 ms	47 ms
scripts.clarity.ms/0.8.59/clarity.js	287 ms	235 ms	27 ms
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js	264 ms	205 ms	58 ms
www.zillow.com/HYx10rg3/init.js	202 ms	168 ms	30 ms
connect.facebook.net/en_US/fbevents.js	191 ms	146 ms	43 ms
/s3/web-platform/sub-apps/search-box-sub-app/search-box-s...	185 ms	158 ms	26 ms
s.pinimg.com/ct/lib/main.10d2511a.js	140 ms	118 ms	19 ms
sc-static.net/scevent.min.js	131 ms	120 ms	6.8 ms
/signals/config/547145892064117?v=2.9.298&r=stable&domain...	123 ms	98 ms	25 ms
/s3/web-platform/sub-apps/buyability-sub-app/buyability-s...	119 ms	1.3 ms	117 ms
cdn.zg-api.com/a/z/js/v1/analytics.js?v=bcf290c	115 ms	89 ms	23 ms
/s3/shopper-platform/_next/static/chunks/main-537631fad5e...	113 ms	65 ms	48 ms
/consent/7e84c9ce-057e-4c91-87ef-56e6d4914637/a84e7f07-b7...	105 ms	89 ms	14 ms
analytics.tiktok.com/i18n/pixel/static/identify_5cff1caf.js	98 ms	45 ms	53 ms
/s3/web-platform/sub-apps/hops-homepage/hops-homepage.pro...	83 ms	53 ms	26 ms
/s3/web-platform/sub-apps/hops-homepage/hops-homepage.pro...	78 ms	3.9 ms	74 ms
/s3/web-platform/sub-apps/buyability-sub-app/buyability-s...	63 ms	1.2 ms	61 ms
www.zillowstatic.com/s3/pfs/core-df6712a376e88526fe76.js	59 ms	52 ms	5.2 ms
/s3/pfs/vendors~productnavApp~regApp~topnavApp-ddac4c5c25...	58 ms	3.5 ms	53 ms
www.google-analytics.com/analytics.js	56 ms	49 ms	6.6 ms
cdn.pubnub.com/sdk/javascript/pubnub.7.5.0.min.js	56 ms	24 ms	32 ms
accounts.google.com/gsi/client	55 ms	25 ms	30 ms
/s3/web-platform/sub-apps/hops-homepage/hops-homepage.pro...	54 ms	50 ms	1.9 ms
/s3/web-platform/sub-apps/buyability-sub-app/buyability-s...	54 ms	48 ms	2.0 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	16.2 s
Style & Layout	2.9 s
Other	2.6 s
Script Parsing & Compilation	2.2 s
Garbage Collection	440 ms
Rendering	234 ms
Parse HTML & CSS	142 ms

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reason	Failure type
The page has an unload handler in a sub frame.	Actionable

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
/s3/constellation-website/public/shared/fonts/inter/LATES...	342.3 KiB
sdk.split.io/api/splitChanges?s=1.3&since=-1&rbSince=-1	304.9 KiB
/s3/constellation-website/public/shared/fonts/open-sans/L...	273.5 KiB
/HYx10rg3/captcha/captcha.js?a=c&u=17e841f0-39bf-11f1-83e...	264.0 KiB
www.zillowstatic.com/bedrock/app/uploads/sites/5/2024/07/image2-m%402x.jpg	243.8 KiB
/s3/web-platform/sub-apps/hops-homepage/hops-homepage.pro...	226.6 KiB
www.googletagmanager.com/gtm.js?id=GTM-P6HT97	214.4 KiB
www.zillowstatic.com/s3/pfs/vendors~productnavApp-f5e5d55e814da72b2063.js	212.3 KiB
/s3/web-platform/sub-apps/buyability-sub-app/buyability-s...	200.0 KiB
www.zillowstatic.com/s3/pfs/vendors~regApp-f54cf63c9480f03326e9.js	174.0 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
Zillow Home Loans, LLC `div.StyledBox-c11n-8-109-3__sc-ocjv7k-0 > div.StyledBox-c11n-8-109-3__sc-ocjv7k-0 > div.StyledBox-c11n-8-109-3__sc-ocjv7k-0 > img`

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

●Optimize DOM size

●Font display

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●Reduce unused CSS

●User Timing marks and measures 45 user timings

●Avoid long main-thread tasks 20 long tasks found

●Network Requests

●Network Round Trip Times 60 ms

●Server Backend Latencies 130 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 250 ms

●Avoid large layout shifts 7 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.

Names and labels

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
body.exclude-from-algorithmic-darkening, > iframe#px-captcha-modal `body.exclude-from-algorithmic-darkening, > iframe#px-captcha-modal`

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.

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
Get home recommendations `div.Flex-c11n-8-111-2__sc-n94bjd-0 > div.StyledBox-c11n-8-111-2__sc-ocjv7k-0 > div.StyledBox-c11n-8-111-2__sc-ocjv7k-0 > h5.Text-c11n-8-111-2__sc-aiai24-0`

These are opportunities to improve keyboard navigation in your application.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
§ 442-H New York Standard Operating Procedures `div.pfs__wsq7ni-0 > div.pfs__sc-1sj5qgb-0 > p.Text-c11n-8-112-0__sc-aiai24-0 > a.Anchor-c11n-8-112-0__sc-hn4bge-0`
§ New York Fair Housing Notice `div.pfs__wsq7ni-0 > div.pfs__sc-1sj5qgb-0 > p.Text-c11n-8-112-0__sc-aiai24-0 > a.Anchor-c11n-8-112-0__sc-hn4bge-0`

These items highlight common accessibility best practices.

○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.

●`[accesskey]` values are unique

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

●`[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

●Skip links are focusable.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Elements with visible text labels have matching accessible names.

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

○Elements with `role="dialog"` or `role="alertdialog"` 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

○`<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.

○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.

Best Practices

User Experience

Image natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn how to provide responsive images.

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Displayed size	Actual size	Expected size
div.StyledBox-c11n-8-111-2__sc-ocjv7k-0 > div.StyledBox-c11n-8-111-2__sc-ocjv7k-0 > picture > img `div.StyledBox-c11n-8-111-2__sc-ocjv7k-0 > div.StyledBox-c11n-8-111-2__sc-ocjv7k-0 > picture > img`	/s3/web-platform/sub-apps/hops-homepage/hops-homepage.pro...	320 x 248	355 x 275	480 x 372

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 / Warning	Source
AttributionReporting	/s3/shopper-platform/_next/static/chunks/pages/_app-74514... line 13, col 393
Unload event listeners are deprecated and will be removed.	/HYx10rg3/captcha/captcha.js?a=c&u=17e841f0-39bf-11f1-83e... line 1, col 206600
Topics	/s3/shopper-platform/_next/static/chunks/pages/_app-74514... line 13, col 393

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
/s3/shopper-platform/_next/static/chunks/pages/_app-74514... line 13, col 176	`[GSI_LOGGER]: FedCM get() rejects with NetworkError: Error retrieving a token.`
www.zillow.com/graphql	`Failed to load resource: the server responded with a status of 403 ()`
www.zillow.com/graphql	`Failed to load resource: the server responded with a status of 403 ()`
/api/user/featureFlags?featureFlags=SHOPPING_ZOAM_MIGRATI...	`Failed to load resource: the server responded with a status of 403 ()`
www.zillow.com/graphql/	`Failed to load resource: the server responded with a status of 403 ()`
www.zillow.com/graphql/	`Failed to load resource: the server responded with a status of 403 ()`
/s3/shopper-platform/_next/static/chunks/pages/_app-74514... line 13, col 176	FetchFeatureFlagFailed: Failed to fetch feature flag. Using default "off" value for graceful degradation. This typically indicates a network issue or misconfigured feature flag. at Object.FetchFeatureFlagValueFailed (https://www.zillowstatic.com/s3/web-platform/sub-apps/buyability-sub-app/buyability-sub-app.prod.main.13920130.3ecd049b/web/663.e0033107.bundle.js:1:26095) at https://www.zillowstatic.com/s3/web-platform/sub-apps/buyability-sub-app/buyability-sub-app.prod.main.13920130.3ecd049b/web/663.e0033107.bundle.js:1:40677 at https://www.zillowstatic.com/s3/web-platform/sub-apps/buyability-sub-app/buyability-sub-app.prod.main.13920130.3ecd049b/web/33.4cbf4102.bundle.js:200:570445 at Generator.<anonymous> (https://www.zillowstatic.com/s3/web-platform/sub-apps/buyability-sub-app/buyability-sub-app.prod.main.13920130.3ecd049b/web/33.4cbf4102.bundle.js:200:567837) at Generator.next (https://www.zillowstatic.com/s3/web-platform/sub-apps/buyability-sub-app/buyability-sub-app.prod.main.13920130.3ecd049b/web/33.4cbf4102.bundle.js:200:566616) at t (https://www.zillowstatic.com/s3/web-platform/sub-apps/buyability-sub-app/buyability-sub-app.prod.main.13920130.3ecd049b/web/33.4cbf4102.bundle.js:200:563242) at b (https://www.zillowstatic.com/s3/web-platform/sub-apps/buyability-sub-app/buyability-sub-app.prod.main.13920130.3ecd049b/web/33.4cbf4102.bundle.js:200:563445)
www.zillow.com/	`Not signed in with the identity provider.`

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.

●Uses HTTPS

●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

●Page has the HTML doctype

●Properly defines charset

●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

○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

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`