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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.

46

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
www.usps.com/assets/images/welcome/carousel/apr26-stamps.png0.0 ms1.9 MiB
www.usps.com/assets/images/welcome/carousel/apr26-cards.png0.0 ms1.0 MiB
www.usps.com/assets/images/welcome/carousel/apr26-gifts.png0.0 ms286.2 KiB
www.usps.com/assets/images/welcome/featured/passport-luggage.jpg0.0 ms158.3 KiB
www.usps.com/assets/images/welcome/premium/id-app-m.jpg0.0 ms126.0 KiB
/signals/config/533374513433337?v=2.9.298&r=stable&domain...1200.0 s126.9 KiB
www.usps.com/assets/images/welcome/featured/cns26-34.jpg0.0 ms111.9 KiB
www.usps.com/W0ci2XILbs/gI8D0ObD/fB/hibukfp0ELJDXD3kXY/cw0VPRww/OzB/yLgsuPigB21600.0 s169.6 KiB
www.usps.com/assets/images/welcome/featured/birthday.jpg0.0 ms105.3 KiB
connect.facebook.net/en_US/fbevents.js1200.0 s96.4 KiB
www.usps.com/assets/images/welcome/featured/po-boxes-box.jpg0.0 ms77.0 KiB
www.usps.com/assets/images/welcome/carousel/sustain-supplies-dotcom8.jpg0.0 ms64.6 KiB
www.usps.com/assets/fonts/d5af76d8-a90b-4527-b3a3-182207cc3250.woff0.0 ms58.1 KiB
www.usps.com/assets/fonts/5b4a262e-3342-44e2-8ad7-719998a68134.woff0.0 ms51.3 KiB
www.usps.com/assets/fonts/4a9c62ab-b359-4081-8383-a0d1cdebd111.woff0.0 ms46.4 KiB
www.usps.com/assets/images/welcome/featured/250-landing-promo-m.jpg0.0 ms37.2 KiB
www.usps.com/assets/images/welcome/featured/250-landing-promo.jpg0.0 ms36.3 KiB
www.usps.com/store/go-now.png0.0 ms31.6 KiB
/js/current/dpm_pixel_min.js?aid=nbc_usps_1351-d4f85824-4...0.0 ms31.6 KiB
www.usps.com/assets/script/globals/jquery.min.js0.0 ms31.0 KiB
www.usps.com/global-elements/footer/script/jquery-3.7.1.js0.0 ms30.4 KiB
cdn.boomtrain.com/p13n/usps-united-states-postal-service/p13n.min.js3600.0 s31.2 KiB
www.usps.com/international/go-now.png0.0 ms22.3 KiB
www.usps.com/ship/go-now.png0.0 ms20.6 KiB
www.usps.com/business/go-now.png0.0 ms20.2 KiB
www.redditstatic.com/ads/pixel.js60.0 s19.0 KiB
www.usps.com/assets/images/campaigns/postmark/postmark-home.png0.0 ms17.6 KiB
www.usps.com/assets/script/globals/bootstrap.js0.0 ms15.8 KiB
c.amazon-adsystem.com/aat/amzn.js0.0 ms8.9 KiB
www.usps.com/manage/go-now.png0.0 ms8.5 KiB
snap.licdn.com/li.lms-analytics/insight.min.js86400.0 s18.7 KiB
www.usps.com/assets/script/globals/popper.min.js0.0 ms7.4 KiB
www.usps.com/global-elements/lib/script/requirejs/require-2.3.6.js0.0 ms7.2 KiB
www.usps.com/global-elements/footer/images/footer-logo.png0.0 ms6.0 KiB
c1.rfihub.net/js/tc.min.js3600.0 s6.5 KiB
www.usps.com/global-elements/header/script/ge-login.js0.0 ms3.5 KiB
www.usps.com/global-elements/header/script/megamenu-v3.js0.0 ms3.5 KiB
www.usps.com/global-elements/footer/images/instagram_logo.png0.0 ms3.5 KiB
www.usps.com/global-elements/footer/images/pinterest_logo.png0.0 ms3.3 KiB
www.usps.com/global-elements/header/images/book-passport-appt.svg0.0 ms2.8 KiB
s.pinimg.com/ct/lib/main.10d2511a.js1209600.0 s27.3 KiB
/sync?c=16b6410431b6374e780104abb0443ca8&p=cd073bead397e7...0.0 ms2.5 KiB
www.usps.com/global-elements/footer/images/facebook_logo.png0.0 ms2.5 KiB
www.usps.com/global-elements/footer/images/threads_logo.png0.0 ms2.5 KiB
www.usps.com/global-elements/header/images/utility-header/logo-sb.svg0.0 ms2.3 KiB
www.usps.com/assets/images/home/hs-code-search.svg0.0 ms2.0 KiB
www.usps.com/global-elements/footer/images/x_logo.png0.0 ms2.0 KiB
www.usps.com/global-elements/header/images/transit-time.svg0.0 ms2.0 KiB
www.usps.com/assets/images/home/location.svg0.0 ms1.9 KiB
www.usps.com/ContentTemplates/common/scripts/OneLinkUsps.js0.0 ms1.8 KiB
ct.pinterest.com/static/ct/token_create.js7200.0 s2.2 KiB
www.usps.com/global-elements/header/script/search-fe.js0.0 ms1.6 KiB
www.usps.com/assets/images/home/change_address.svg0.0 ms1.6 KiB
www.usps.com/assets/images/home/schedule_pickup.svg0.0 ms1.6 KiB
www.usps.com/assets/images/home/logo_mobile.svg0.0 ms1.6 KiB
www.usps.com/global-elements/header/images/utility-header/mailman.svg0.0 ms1.6 KiB
www.usps.com/global-elements/footer/images/youtube_logo.png0.0 ms1.6 KiB
s.pinimg.com/ct/core.js7200.0 s2.1 KiB
www.usps.com/assets/images/home/po_box.svg0.0 ms1.6 KiB
www.usps.com/assets/images/home/tracking.svg0.0 ms1.5 KiB
www.usps.com/assets/images/home/search.svg0.0 ms1.5 KiB
www.usps.com/assets/images/home/find_zip.svg0.0 ms1.5 KiB
www.usps.com/assets/images/home/calculate_price.svg0.0 ms1.5 KiB
www.usps.com/assets/images/home/holdmail.svg0.0 ms1.5 KiB
analytics-sm.com/js/v1/beacon.js600.0 s1.5 KiB
www.usps.com/assets/images/home/free_boxes.svg0.0 ms1.4 KiB
www.usps.com/assets/images/home/stamps.svg0.0 ms1.3 KiB
www.usps.com/assets/script/home/megamenu-additions.js0.0 ms1.2 KiB
www.usps.com/assets/images/home/featured_clicknship.svg0.0 ms1.2 KiB
www.usps.com/global-elements/lib/script/resize-manager.js0.0 ms1.2 KiB
www.usps.com/assets/script/welcome/welcome.js0.0 ms1.1 KiB
/global-elements/header/images/utility-header/m_dropdown_...0.0 ms1.1 KiB
www.usps.com/component-guide/blue-caret.svg0.0 ms1.1 KiB
www.usps.com/global-elements/lib/script/helpers.js0.0 ms1.1 KiB
www.usps.com/global-elements/header/script/header-search.js0.0 ms1.1 KiB
fast.fonts.net/t/trackingCode.js300.0 s1.1 KiB
www.usps.com/assets/images/home/hamburger.svg0.0 ms1.0 KiB
www.usps.com/global-elements/lib/script/require-jquery.js0.0 ms835 B
/collect?v=2&fmt=js&pid=4321490&time=1776363063543&url=ht...0.0 ms693 B
/rp.gif?ts=1776363063525&id=t2_txtps67&event=PageVisit&m....0.0 ms666 B
/pixel?c=bd8618c307ae9885a12561b7191e2cea&cid=51333295401...0.0 ms621 B
/t/1.css?apiType=css&projectid=f3e4655b-fd06-4b8b-8a25-01...1.0 s521 B
/config/com/cc41fce6-e245-447e-b170-1c36414f246a.js?v=3.5...0.0 ms466 B
ps.eyeota.net/match?uid=5109685641978801789&bid=omt9pi00.0 ms354 B
/pixel/capture?tags=8dd8cf55-3ae9-49dc-a25a-83dcfc60de58&...0.0 ms184 B
partners.tremorhub.com/sync?UIRF=5133329540174559069&r=kkCj8OgKq5Dd0.0 ms175 B
/snoo.gif?q=CAAHAAABAAoACQAAAA8sjYvfAA==&s=758ZB25Erv8S36...0.0 ms75 B
/tr/?id=533374513433337&ev=PageView&dl=https%3A%2F%2Fwww....0.0 ms19 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:0.130812] map[node:map[boundingRect:map[bottom:782 height:353 left:0 right:412 top:429 width:412] lhId:page-14-DIV nodeLabel:Click-N-Ship® Buy Stamps Informed Delivery® PO Boxes™ Calculate a Price Hold Ma… path:1,HTML,1,BODY,29,DIV selector:body > div.quicktools snippet:<div data-gtm-section="quicktools" class="quicktools track-opt" data-gtm-vis-recent-on-screen2384666_2691="456" data-gtm-vis-first-on-screen2384666_2691="456" data-gtm-vis-total-visible-time2384666_2691="100" data-gtm-vis-has-fired2384666_2691="1"> type:node] score:0.078086 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:246 height:94 left:0 right:412 top:152 width:412] lhId:page-2-IMG nodeLabel:An Informed Delivery preview email on a smartphone. path:1,HTML,1,BODY,26,DIV,0,DIV,1,DIV,0,IMG selector:div.jumbotron > div.container-fluid > div.row > img snippet:<img src="/assets/images/welcome/premium/id-app-m.jpg" alt="An Informed Delivery preview email on a smartphone."> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:986 height:174 left:0 right:412 top:812 width:412] lhId:page-10-DIV nodeLabel:Postmarks: If you want to ensure that your mail receives a postmark on the day … path:1,HTML,1,BODY,34,DIV selector:body > div.inpage-alert snippet:<div class="inpage-alert no-icon"> type:node] score:0.052726 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:493 height:29 left:60 right:89 top:464 width:29] lhId:page-16-IMG nodeLabel:Printer Icon Link for Click-N-Ship path:1,HTML,1,BODY,29,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,A,0,IMG selector:div.col-lg-2 > div.article > a > img.mx-auto snippet:<img alt="Printer Icon Link for Click-N-Ship" class="mx-auto" src="https://www.usps.com/assets/images/home/featured_clicknship.svg"> type:node]]] type:subitems]]]

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.usps.com/assets/fonts/d5af76d8-a90b-4527-b3a3-182207cc3250.woff75 ms
www.usps.com/assets/fonts/4a9c62ab-b359-4081-8383-a0d1cdebd111.woff55 ms
www.usps.com/assets/fonts/5b4a262e-3342-44e2-8ad7-719998a68134.woff45 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
Forever Stamps available from The Postal Store. div#usps-carousel > div.carousel-inner > div.carousel-item > img.d-block
www.usps.com/assets/images/welcome/carousel/apr26-stamps.png1.9 MiB1.9 MiB
A person holding up a passport with luggage in the background. div.container-fluid > div.row > div.col-lg-7 > img
www.usps.com/assets/images/welcome/featured/passport-luggage.jpg157.6 KiB144.2 KiB
An Informed Delivery preview email on a smartphone. div.jumbotron > div.container-fluid > div.row > img
www.usps.com/assets/images/welcome/premium/id-app-m.jpg125.3 KiB119.0 KiB
Person placing a label on a package. div.container-fluid > div.row > div.col-lg-7 > img
www.usps.com/assets/images/welcome/featured/cns26-34.jpg111.2 KiB97.7 KiB
Happy Birthday Forever Stamp. div.container-fluid > div.row > div.col-lg-7 > img
www.usps.com/assets/images/welcome/featured/birthday.jpg104.6 KiB91.0 KiB
An open PO Box with mail inside and a key in the lock. div.container-fluid > div.row > div.col-lg-7 > img
www.usps.com/assets/images/welcome/featured/po-boxes-box.jpg76.3 KiB62.7 KiB
USPS 250th anniversary. Delivering since 1775. Celebrate 250 years of USPS! Exp… div > div.container-fluid > a > img.d-lg-none
www.usps.com/assets/images/welcome/featured/250-landing-promo-m.jpg36.5 KiB18.2 KiB
A postmark stamp that shows a cancellation date of January 13, 2026, in New Yor… div.inpage-alert > div.container-fluid > div.alert-p > img
www.usps.com/assets/images/campaigns/postmark/postmark-home.png16.9 KiB16.1 KiB
body > div#global-footer--wrap > footer.global-footer > a.global-footer--logo-link body > div#global-footer--wrap > footer.global-footer > a.global-footer--logo-link
www.usps.com/global-elements/footer/images/footer-logo.png5.3 KiB4.3 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-2-IMG
nodeLabel: An Informed Delivery preview email on a smartphone.
path: 1,HTML,1,BODY,26,DIV,0,DIV,1,DIV,0,IMG
selector: div.jumbotron > div.container-fluid > div.row > img
snippet: <img src="/assets/images/welcome/premium/id-app-m.jpg" alt="An Informed Delivery preview email on a smartphone.">

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
value: No additional origins are good candidates for preconnecting

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.

URLTransfer SizeDuration
www.usps.com/global-elements/header/css/megamenu-v4.css8.0 KiB
www.usps.com/assets/css/welcome/bootstrap.css26.6 KiB300 ms

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

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: 1.1 s
URLTime Spent
usps.com/1.1 s
www.usps.com/0.0 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

ElementLayout shift score
Click-N-Ship® Buy Stamps Informed Delivery® PO Boxes™ Calculate a Price Hold Ma… body > div.quicktools
0.078
Postmarks: If you want to ensure that your mail receives a postmark on the day … body > div.inpage-alert
0.053

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.

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: 300 ms 24.4 KiB
URLTransfer SizeEst Savings
www.usps.com/assets/css/welcome/bootstrap.css25.9 KiB24.4 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: 300 ms 400.2 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtm.js?id=GTM-MVCC8H210.0 KiB66.3 KiB
www.googletagmanager.com/gtag/destination?id=DC-3976941&cx=c&gtm=4e64f0h1129.2 KiB64.8 KiB
www.googletagmanager.com/gtag/js?id=AW-978081151141.3 KiB63.4 KiB
www.googletagmanager.com/gtm.js?id=GTM-K2FRZL4&gtm=4e64f0h1160.7 KiB58.2 KiB
www.usps.com/W0ci2XILbs/gI8D0ObD/fB/hibukfp0ELJDXD3kXY/cw0VPRww/OzB/yLgsuPigB168.7 KiB37.3 KiB
/signals/config/533374513433337?v=2.9.298&r=stable&domain...126.8 KiB36.7 KiB
connect.facebook.net/en_US/fbevents.js96.3 KiB33.4 KiB
www.usps.com/global-elements/footer/script/jquery-3.7.1.js29.7 KiB20.1 KiB
www.usps.com/assets/script/globals/jquery.min.js30.2 KiB20.1 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTotal CPU TimeScript EvaluationScript Parse
Unattributable983 ms113 ms0.0 ms
www.usps.com/W0ci2XILbs/gI8D0ObD/fB/hibukfp0ELJDXD3kXY/cw0VPRww/OzB/yLgsuPigB885 ms784 ms48 ms
www.googletagmanager.com/gtm.js?id=GTM-MVCC8H541 ms470 ms64 ms
www.usps.com/532 ms26 ms4.5 ms
www.googletagmanager.com/gtm.js?id=GTM-K2FRZL4&gtm=4e64f0h1507 ms417 ms63 ms
/signals/config/533374513433337?v=2.9.298&r=stable&domain...246 ms215 ms31 ms
www.googletagmanager.com/gtag/destination?id=DC-3976941&cx=c&gtm=4e64f0h1242 ms201 ms38 ms
sc-static.net/scevent.min.js192 ms167 ms4.9 ms
www.usps.com/global-elements/footer/script/jquery-3.7.1.js178 ms126 ms35 ms
connect.facebook.net/en_US/fbevents.js158 ms124 ms32 ms
www.googletagmanager.com/gtag/js?id=AW-978081151120 ms64 ms54 ms
/js/current/dpm_pixel_min.js?aid=nbc_usps_1351-d4f85824-4...111 ms85 ms10.0 ms
snap.licdn.com/li.lms-analytics/insight.min.js97 ms79 ms13 ms
cdn.boomtrain.com/p13n/usps-united-states-postal-service/p13n.min.js89 ms71 ms8.5 ms
s.pinimg.com/ct/lib/main.10d2511a.js78 ms62 ms10 ms
www.redditstatic.com/ads/pixel.js65 ms51 ms9.3 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 Evaluation3.2 s
Other998 ms
Script Parsing & Compilation464 ms
Style & Layout358 ms
Garbage Collection92 ms
Rendering79 ms
Parse HTML & CSS71 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.

URLTransfer Size
www.usps.com/assets/images/welcome/carousel/apr26-stamps.png1.9 MiB
www.usps.com/assets/images/welcome/carousel/apr26-cards.png1.0 MiB
www.usps.com/assets/images/welcome/carousel/apr26-gifts.png286.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-MVCC8H210.3 KiB
www.usps.com/W0ci2XILbs/gI8D0ObD/fB/hibukfp0ELJDXD3kXY/cw0VPRww/OzB/yLgsuPigB169.6 KiB
www.googletagmanager.com/gtm.js?id=GTM-K2FRZL4&gtm=4e64f0h1160.7 KiB
www.usps.com/assets/images/welcome/featured/passport-luggage.jpg158.3 KiB
www.googletagmanager.com/gtag/js?id=AW-978081151141.4 KiB
www.googletagmanager.com/gtag/destination?id=DC-3976941&cx=c&gtm=4e64f0h1129.3 KiB
/signals/config/533374513433337?v=2.9.298&r=stable&domain...126.9 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
Forever Stamps available from The Postal Store. div#usps-carousel > div.carousel-inner > div.carousel-item > img.d-block
www.usps.com/assets/images/welcome/carousel/apr26-stamps.png
A person holding up a passport with luggage in the background. div.container-fluid > div.row > div.col-lg-7 > img
www.usps.com/assets/images/welcome/featured/passport-luggage.jpg
Person placing a label on a package. div.container-fluid > div.row > div.col-lg-7 > img
www.usps.com/assets/images/welcome/featured/cns26-34.jpg
Happy Birthday Forever Stamp. div.container-fluid > div.row > div.col-lg-7 > img
www.usps.com/assets/images/welcome/featured/birthday.jpg
An open PO Box with mail inside and a key in the lock. div.container-fluid > div.row > div.col-lg-7 > img
www.usps.com/assets/images/welcome/featured/po-boxes-box.jpg
An Informed Delivery preview email on a smartphone. div.jumbotron > div.container-fluid > div.row > img
www.usps.com/assets/images/welcome/premium/id-app-m.jpg
USPS 250th anniversary. Delivering since 1775. Celebrate 250 years of USPS! Exp… div > div.container-fluid > a > img.d-lg-none
www.usps.com/assets/images/welcome/featured/250-landing-promo-m.jpg
USPS mobile logo div.nav-full > div.mobile-header > a.mobile-logo > img
www.usps.com/assets/images/home/logo_mobile.svg
Tracking Icon ul > li > a > img
www.usps.com/assets/images/home/tracking.svg
Search Icon div.nav-full > div.mobile-header > a.mobile-search > img
www.usps.com/assets/images/home/search.svg
Informed Delivery Icon ul > li > a > img
www.usps.com/global-elements/header/images/utility-header/mailman.svg
Post Office Locator Icon ul > li > a > img
www.usps.com/assets/images/home/location.svg
Stamps Icon ul > li > a > img
www.usps.com/assets/images/home/stamps.svg
ul > li > a > img ul > li > a > img
www.usps.com/global-elements/header/images/book-passport-appt.svg
Schedule a Pickup Icon ul > li > a > img
www.usps.com/assets/images/home/schedule_pickup.svg
Calculate a Price Icon ul > li > a > img
www.usps.com/assets/images/home/calculate_price.svg
Zip Code™ Lookup Icon ul > li > a > img
www.usps.com/assets/images/home/find_zip.svg
Holdmail Icon ul > li > a > img
www.usps.com/assets/images/home/holdmail.svg
ul > li > a > img ul > li > a > img
www.usps.com/global-elements/header/images/transit-time.svg
Change of Address Icon ul > li > a > img
www.usps.com/assets/images/home/change_address.svg
Post Office Boxes Icon ul > li > a > img
www.usps.com/assets/images/home/po_box.svg
Shipping Supplies Icon ul > li > a > img
www.usps.com/assets/images/home/free_boxes.svg
ul > li > a > img ul > li > a > img
www.usps.com/assets/images/home/hs-code-search.svg
Stamp Icon Link for Buy Stamps div.col-lg-2 > div.article > a > img.mx-auto
www.usps.com/assets/images/home/stamps.svg
Mail Carrier Icon Link for Informed Delivery div.col-lg-2 > div.article > a > img.mx-auto
www.usps.com/global-elements/header/images/utility-header/mailman.svg
PO Box Icon Link for PO Boxes div.col-4 > div.article > a > img.mx-auto
www.usps.com/assets/images/home/po_box.svg
Calculator Icon Link for Calculate a Price div.col-4 > div.article > a > img.mx-auto
www.usps.com/assets/images/home/calculate_price.svg
Stop mail Icon Link for Hold Mail div.col-4 > div.article > a > img.mx-auto
www.usps.com/assets/images/home/holdmail.svg
ZIP Code Location Finder Icon Link for Look up a ZIP Code div.col-4 > div.article > a > img.mx-auto
www.usps.com/assets/images/home/find_zip.svg
House Icon Link for Change My Address div.col-4 > div.article > a > img.mx-auto
www.usps.com/assets/images/home/change_address.svg
Box and clock Icon Link for Schedule a Pickup div.col-4 > div.article > a > img.mx-auto
www.usps.com/assets/images/home/schedule_pickup.svg
Click-N-Ship Icon ul > li > a > img
www.usps.com/assets/images/home/featured_clicknship.svg
Printer Icon Link for Click-N-Ship div.col-lg-2 > div.article > a > img.mx-auto
www.usps.com/assets/images/home/featured_clicknship.svg
A postmark stamp that shows a cancellation date of January 13, 2026, in New Yor… div.inpage-alert > div.container-fluid > div.alert-p > img
www.usps.com/assets/images/campaigns/postmark/postmark-home.png
hamburger menu Icon div.nav-full > div.mobile-header > a.mobile-hamburger > img
www.usps.com/assets/images/home/hamburger.svg
Image of Threads social media icon. ul.global-footer--social > li > a > img
www.usps.com/global-elements/footer/images/threads_logo.png
Image of X social media icon. ul.global-footer--social > li > a > img
www.usps.com/global-elements/footer/images/x_logo.png
Image of Facebook social media icon. ul.global-footer--social > li > a > img
www.usps.com/global-elements/footer/images/facebook_logo.png
Image of instagram social media icon. ul.global-footer--social > li > a > img
www.usps.com/global-elements/footer/images/instagram_logo.png
Image of Pinterest social media icon. ul.global-footer--social > li > a > img
www.usps.com/global-elements/footer/images/pinterest_logo.png
Image of Youtube social media icon. ul.global-footer--social > li > a > img
www.usps.com/global-elements/footer/images/youtube_logo.png
body > img body > img
/pixel/capture?tags=8dd8cf55-3ae9-49dc-a25a-83dcfc60de58&...

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

●Optimize DOM size
●Forced reflow
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 1 user timing
●Avoid long main-thread tasks 20 long tasks found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 130 ms
●Server Backend Latencies 180 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 20 ms
○INP breakdown
○Avoid non-composited animations
68

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.

ARIA

Each ARIA `role` supports a specific subset of `aria-*` attributes. Mismatching these invalidates the `aria-*` attributes. Learn how to match ARIA attributes to their roles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Slide 1 div#usps-carousel > div.carousel-inner > ol.carousel-indicators > li.active
Slide 2 div#usps-carousel > div.carousel-inner > ol.carousel-indicators > li
Slide 3 div#usps-carousel > div.carousel-inner > ol.carousel-indicators > li
Slide 4 div#usps-carousel > div.carousel-inner > ol.carousel-indicators > li

Some ARIA parent roles must contain specific child roles to perform their intended accessibility functions. Learn more about roles and required children elements.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Skip Quick Tools Links Quick Tools Track a Package Informed Delivery … div#g-navigation > div.nav-full > nav > ul.nav-list

Some ARIA child roles must be contained by specific parent roles to properly perform their intended accessibility functions. Learn more about ARIA roles and required parent element.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Quick Tools nav > ul.nav-list > li.qt-nav > a.nav-first-element
Send nav > ul.nav-list > li.menuheader > a#mail-ship-width
Receive nav > ul.nav-list > li.menuheader > a.menuitem
Shop nav > ul.nav-list > li.menuheader > a.menuitem
Business nav > ul.nav-list > li.menuheader > a.menuitem
International nav > ul.nav-list > li.menuheader > a.menuitem
Help nav > ul.nav-list > li.menuheader > a.menuitem
PO BOXES div.empty-search > ul > li > a
PASSPORTS div.empty-search > ul > li > a
FREE BOXES div.empty-search > ul > li > a

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Names and labels

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
body > img body > img

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
  body > div#g-navigation > div.nav-full > a#endnav
USPS 250th anniversary. Delivering since 1775. Celebrate 250 years of USPS! Exp… section.jumbotron > div > div.container-fluid > a
body > div#global-footer--wrap > footer.global-footer > a.global-footer--logo-link body > div#global-footer--wrap > footer.global-footer > a.global-footer--logo-link

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.

Tables and lists

Screen readers require list items (`<li>`) to be contained within a parent `<ul>`, `<ol>` or `<menu>` to be announced properly. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Skip Quick Tools Links Quick Tools Track a Package Informed Delivery … div.nav-full > nav > ul.nav-list > li.qt-nav
Skip Send Links Send Tools Click-N-Ship Stamps & Supplies Look Up a ZIP Code™ C… div.nav-full > nav > ul.nav-list > li.menuheader
Skip Receive Links Receive Tools Tracking Informed Delivery Intercept a Package… div.nav-full > nav > ul.nav-list > li.menuheader
Skip Shop Links Shop Shop Stamps Shipping Supplies Cards & Envelopes Personaliz… div.nav-full > nav > ul.nav-list > li.menuheader
Skip Business Links Business Tools Calculate a Business Price Every Door Direct… div.nav-full > nav > ul.nav-list > li.menuheader
Skip International Links International Tools Calculate International Prices Pri… div.nav-full > nav > ul.nav-list > li.menuheader
Skip Help Links Help FAQs Finding Missing Mail Filing a Claim Requesting a Refu… div.nav-full > nav > ul.nav-list > li.menuheader
Slide 1 div#usps-carousel > div.carousel-inner > ol.carousel-indicators > li.active
Slide 2 div#usps-carousel > div.carousel-inner > ol.carousel-indicators > li
Slide 3 div#usps-carousel > div.carousel-inner > ol.carousel-indicators > li
Slide 4 div#usps-carousel > div.carousel-inner > ol.carousel-indicators > li

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

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

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
USPS Service Updates li.global-footer--navigation-category > ol.global-footer--navigation-options > li > a
Forms & Publications li.global-footer--navigation-category > ol.global-footer--navigation-options > li > a
Government Services li.global-footer--navigation-category > ol.global-footer--navigation-options > li > a
Rights & Permissions li.global-footer--navigation-category > ol.global-footer--navigation-options > li > a
Postal Inspectors li.global-footer--navigation-category > ol.global-footer--navigation-options > li > a
Inspector General li.global-footer--navigation-category > ol.global-footer--navigation-options > li > a
Postal Explorer li.global-footer--navigation-category > ol.global-footer--navigation-options > li > a
National Postal Museum li.global-footer--navigation-category > ol.global-footer--navigation-options > li > a
Resources for Developers li.global-footer--navigation-category > ol.global-footer--navigation-options > li > a
Privacy Policy li.global-footer--navigation-category > ol.global-footer--navigation-options > li > a
Terms of Use li.global-footer--navigation-category > ol.global-footer--navigation-options > li > a

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html html

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-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
●Input buttons have discernible text.
●Form elements have associated labels
●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.
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●No element has a `[tabindex]` value greater than 0
●Heading elements appear in a sequentially-descending order
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
○`[accesskey]` values are unique
○`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 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 type="image">` elements have `[alt]` text
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[lang]` attributes have a valid value
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○Elements with visible text labels have matching accessible names.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
73

Best Practices

General

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / WarningSource
AttributionReporting
snap.licdn.com/li.lms-analytics/insight.min.js
SharedStorage
c.amazon-adsystem.com/aat/amzn.js line 1, col 7935

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

SourceDescription
www.usps.com/
Attestation check for Shared Storage on https://ara.paa-reporting-advertising.amazon failed.
www.usps.com/W0ci2XILbs/gI8D0ObD/fB/hibukfp0ELJDXD3kXY/cw0VPRww/OzB/yLgsuPigB
Creating a worker from 'blob:https://www.usps.com/961ef534-3a48-492b-b8b3-799fe8f0a277' violates the following Content Security Policy directive: "script-src 'self' 'unsafe-inline' 'unsafe-eval' https:". Note that 'worker-src' was not explicitly set, so 'script-src' is used as a fallback. The action has been blocked.

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.

URLMap URL
www.usps.com/W0ci2XILbs/gI8D0ObD/fB/hibukfp0ELJDXD3kXY/cw0VPRww/OzB/yLgsuPigB
www.usps.com/assets/script/globals/popper.min.jswww.usps.com/assets/script/globals/popper.min.js.map
www.usps.com/assets/script/globals/bootstrap.jswww.usps.com/assets/script/globals/bootstrap.min.js.map
s.pinimg.com/ct/lib/main.10d2511a.jss.pinimg.com/ct/lib/main.10d2511a.js.map
s.pinimg.com/ct/core.jss.pinimg.com/ct/core.js.map
ct.pinterest.com/static/ct/token_create.jsct.pinterest.com/static/ct/token_create.js.map
●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
●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
85

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.

Content Best Practices

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Link destinationLink Text
www.usps.com/manage/informed-delivery.htmLearn More
www.usps.com/manage/informed-delivery.htmLearn More
/s/article/Requirements-and-Standards-for-Sending-Domesti...Learn more

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
body > img body > img

Format your HTML in a way that enables crawlers to better understand your app’s content.

○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 are crawlable
●robots.txt is valid
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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