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

Audit breakdown by category with detailed findings.

86

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
i.ytimg.com/vi/oVfr1cqdkVU/oardefault.jpg7200.0 s318.5 KiB
i.ytimg.com/vi/U5rGcUER9Gg/oardefault.jpg7200.0 s303.2 KiB
i.ytimg.com/vi/hAn1UEPe64A/oardefault.jpg7200.0 s265.5 KiB
i.ytimg.com/vi/L9f4dp6tGTM/oardefault.jpg7200.0 s264.2 KiB
i.ytimg.com/vi/PGdLsa_NsmE/oardefault.jpg300.0 s202.3 KiB
i.ytimg.com/vi/RKjtN39ab5c/oardefault.jpg7200.0 s226.1 KiB
i.ytimg.com/vi/D6xEeYmdFZQ/oardefault.jpg7200.0 s218.1 KiB
i.ytimg.com/vi/KugVtULh1e4/oardefault.jpg7200.0 s200.7 KiB
i.ytimg.com/vi/aGPO5pQYgLo/oardefault.jpg7200.0 s193.2 KiB
i.ytimg.com/vi/kA6sJnmUgg8/oardefault.jpg7200.0 s187.3 KiB
i.ytimg.com/vi/xAl5IcImxTg/oardefault.jpg7200.0 s168.5 KiB
i.ytimg.com/vi/qcN3J1FvLA4/oardefault.jpg7200.0 s168.1 KiB
i.ytimg.com/vi/C84G-ycZ-NI/oardefault.jpg7200.0 s167.1 KiB
i.ytimg.com/vi/6pPT5ewhCwU/oardefault.jpg7200.0 s166.1 KiB
i.ytimg.com/vi/_1Ta4yMQrhg/oardefault.jpg7200.0 s161.0 KiB
i.ytimg.com/vi/2XAfZScByuA/oardefault.jpg7200.0 s149.2 KiB
i.ytimg.com/vi/jImwduiZ4Fw/oardefault.jpg7200.0 s146.0 KiB
i.ytimg.com/vi/QedkogNjHxc/oardefault.jpg7200.0 s144.8 KiB
i.ytimg.com/vi/lHFb4qQb3cM/oardefault.jpg7200.0 s138.2 KiB
i.ytimg.com/vi/RlVF5JXUakA/oardefault.jpg7200.0 s137.5 KiB
i.ytimg.com/vi/I048C2POg24/oardefault.jpg300.0 s102.6 KiB
i.ytimg.com/vi/94Ld55UeUUE/oardefault.jpg7200.0 s123.9 KiB
connect.facebook.net/en_US/fbevents.js1200.0 s96.6 KiB
i.ytimg.com/vi/xAzDShdnoy0/oardefault.jpg7200.0 s104.2 KiB
i.ytimg.com/vi/PBKhFRX99n8/oardefault.jpg7200.0 s102.6 KiB
i.ytimg.com/vi/5VZdHKUJzqA/oardefault.jpg7200.0 s97.7 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js3600.0 s73.1 KiB
/signals/config/1723321954577947?v=2.9.303&r=stable&domai...1200.0 s44.5 KiB
static.wbur.org/app/prod/_next/static/chunks/framework-3671d8951bf44e4e.js86400.0 s45.1 KiB
static.wbur.org/app/prod/_next/static/chunks/pages/_app-59a5a31066e9b209.js86400.0 s41.8 KiB
static.chartbeat.com/js/chartbeat.js7200.0 s15.9 KiB
static.wbur.org/app/prod/_next/static/chunks/main-7255a5b37ac1abcb.js86400.0 s26.7 KiB
snap.licdn.com/li.lms-analytics/insight.min.js86400.0 s18.7 KiB
static.wbur.org/app/prod/_next/static/css/101908e8ad467ff4.css86400.0 s18.1 KiB
js.ipredictive.com/viant_universal_pixel.js0.0 ms3.5 KiB
static.wbur.org/app/prod/_next/static/chunks/webpack-2abc3cb57f49024d.js86400.0 s4.6 KiB
static.wbur.org/app/prod/_next/static/chunks/3946.1a247f661bd1b93a.js86400.0 s4.4 KiB
static.wbur.org/app/prod/_next/static/chunks/4587.add7a42ecb4a6edd.js86400.0 s3.2 KiB
static.wbur.org/app/prod/_next/static/chunks/2707-f956f40990fa7d87.js86400.0 s2.9 KiB
static.wbur.org/app/prod/_next/static/chunks/5761-3eb3c5075f80ac54.js86400.0 s2.8 KiB
static.wbur.org/app/prod/_next/static/chunks/7189.352e8cd19c296e73.js86400.0 s2.5 KiB
static.wbur.org/app/prod/_next/static/chunks/1062.628c157721bddc11.js86400.0 s2.4 KiB
static.wbur.org/app/prod/_next/static/chunks/5281.4d4975daf5877198.js86400.0 s2.3 KiB
static.wbur.org/app/prod/_next/static/chunks/9111.9f24c02f91caeb10.js86400.0 s2.2 KiB
static.wbur.org/app/prod/_next/static/chunks/pages/index-00e064fe595ec3c7.js86400.0 s2.2 KiB
pagead2.googlesyndication.com/pagead/js/r20260420/r20110914/abg_lite_fy2021.js1209600.0 s8.4 KiB
static.wbur.org/app/prod/_next/static/chunks/7239.16b3f00b34b57eb1.js86400.0 s1.9 KiB
static.wbur.org/app/prod/_next/static/chunks/2968.af7e4fe703e393b1.js86400.0 s1.9 KiB
static.wbur.org/app/prod/_next/static/2663m7FWifZlAhERnM6_4/_buildManifest.js86400.0 s1.8 KiB
/collect?v=2&fmt=js&pid=1905090&time=1776808823178&url=ht...0.0 ms694 B
static.wbur.org/app/prod/_next/static/css/7f21c4c99e0b3173.css86400.0 s1.6 KiB
static.wbur.org/app/prod/_next/static/css/de1e2c018a6f8bea.css86400.0 s1.4 KiB
s3.amazonaws.com/static.wbur/scripts/ads/clever_ads.js0.0 ms513 B
static.wbur.org/app/prod/_next/static/chunks/6339.03cececbddf52e33.js86400.0 s1.2 KiB
static.wbur.org/app/prod/_next/static/chunks/8897.19f470358777127d.js86400.0 s1.2 KiB
static.wbur.org/app/prod/_next/static/css/3e84c7a8b158b22a.css86400.0 s1.1 KiB
static.wbur.org/app/prod/_next/static/css/526e3c0387a7efc2.css86400.0 s1004 B
static.wbur.org/app/prod/_next/static/css/575ea2e67ada9f90.css86400.0 s1001 B
static.wbur.org/app/prod/_next/static/css/09ef119776eb39a0.css86400.0 s982 B
static.wbur.org/app/prod/_next/static/css/b6e41fc25205e4e6.css86400.0 s891 B
static.wbur.org/app/prod/_next/static/chunks/344.8a00a07be5ab3ae7.js86400.0 s803 B
www.gstatic.com/recaptcha/api2/logo_48.png604800.0 s2.3 KiB
static.wbur.org/app/prod/_next/static/2663m7FWifZlAhERnM6_4/_ssgManifest.js86400.0 s482 B
/tr/?id=1723321954577947&ev=PageView&dl=https%3A%2F%2Fwww...0.0 ms16 B
static.wbur.org/app/prod/_next/static/chunks/pages/radio-9faf7017d2e83ba8.js86400.0 s0 B
/app/prod/_next/static/chunks/pages/newsletters-753c9ffc1...86400.0 s0 B
/app/prod/_next/static/chunks/pages/[channel]-1674baf897a...86400.0 s0 B
static.wbur.org/app/prod/_next/static/chunks/pages/podcasts-8ad3eddab4f1a463.js86400.0 s0 B
static.wbur.org/app/prod/_next/static/chunks/1083-fac790441d24d3e6.js86400.0 s0 B
static.wbur.org/app/prod/_next/static/chunks/7565-7b5c609497b3230a.js86400.0 s0 B
/app/prod/_next/static/chunks/pages/[channel]/[yyyy]/[mm]...86400.0 s0 B
/app/prod/_next/static/chunks/pages/npr/[id]/[slug]-90c46...86400.0 s0 B
/app/prod/_next/static/chunks/pages/radio/programs/[chann...86400.0 s0 B
/app/prod/_next/static/chunks/pages/[channel]/section/[se...86400.0 s0 B

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
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff240 ms

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:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:37.196 source:map[type:text value:[unattributed]]]]

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
Have you been following the local news this week? Take our Boston News Quiz li > article > a#section-features-fig-2 > img.card-fig
media.wbur.org/config/2024/10/10/news_quiz_no_logo_3-2.png694.9 KiB685.1 KiB
Vertical video titled 'Bobbi Gibb gets a statue on the Boston Marathon course' div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/oVfr1cqdkVU/oardefault.jpg318.3 KiB302.3 KiB
head > link head > link
tpc.googlesyndication.com/simgad/13240187096411075953?308.1 KiB297.9 KiB
Vertical video titled 'The story behind Evacuation Day' div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/U5rGcUER9Gg/oardefault.jpg302.9 KiB286.0 KiB
Vertical video titled 'The Duck Boat Challenge on Boston Common' div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/hAn1UEPe64A/oardefault.jpg265.3 KiB252.0 KiB
Vertical video titled 'Boston Public Schools hadn't until now fined bus vendor … div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/L9f4dp6tGTM/oardefault.jpg264.0 KiB250.7 KiB
Vertical video titled 'Romney returns to Mass. 20 years after 'Romneycare' pass… div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/RKjtN39ab5c/oardefault.jpg225.9 KiB209.0 KiB
Vertical video titled 'Flavor Flav invited women Olympic medalists to celebrate… div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/KugVtULh1e4/oardefault.jpg200.5 KiB190.5 KiB
Vertical video titled 'The 2026 Boston Marathon' div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/PGdLsa_NsmE/oardefault.jpg202.1 KiB185.2 KiB
Vertical video titled 'How the Civil War shaped voting by mail' div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/kA6sJnmUgg8/oardefault.jpg187.2 KiB177.8 KiB
Vertical video titled 'Isabella Stewart Gardner Museum solves a new mystery' div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/aGPO5pQYgLo/oardefault.jpg193.0 KiB176.1 KiB
Vertical video titled 'This phone bridges a generational divide' div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/xAl5IcImxTg/oardefault.jpg168.3 KiB159.9 KiB
Vertical video titled 'Thousands in Boston join third national 'No Kings' prote… div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/C84G-ycZ-NI/oardefault.jpg166.9 KiB158.5 KiB
Vertical video titled 'Become a WBUR member today!' div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/6pPT5ewhCwU/oardefault.jpg166.0 KiB157.6 KiB
Vertical video titled 'Skiing in a Boston blizzard' div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/qcN3J1FvLA4/oardefault.jpg168.0 KiB151.0 KiB
Vertical video titled 'Mayor Wu talks changes to Boston's snow cleanup' div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/_1Ta4yMQrhg/oardefault.jpg160.9 KiB143.9 KiB
Vertical video titled 'Blizzard impacts on Cape Cod' div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/2XAfZScByuA/oardefault.jpg149.0 KiB132.2 KiB
Vertical video titled 'Mayor Wu talks city finances' div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/RlVF5JXUakA/oardefault.jpg137.3 KiB130.4 KiB
Vertical video titled 'Jordan Walsh hates losing' div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/QedkogNjHxc/oardefault.jpg144.7 KiB128.3 KiB
Vertical video titled 'Is this the Lego of the future?' div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/94Ld55UeUUE/oardefault.jpg123.8 KiB117.6 KiB
The Harold F. Johnson Library at the center of Hampshire College's campus. (Rob… div.Horizontal_flush__ur8Uc > a#section-horizontal-fig-1 > picture > img
media.wbur.org/wp/2026/04/1004_hampshire-05-1000x668.jpg143.0 KiB99.8 KiB
Vertical video titled 'Boston police officer faces manslaughter charge in fatal… div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/xAzDShdnoy0/oardefault.jpg103.7 KiB92.0 KiB
Vertical video titled 'Meet the multi-marathoners' div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/I048C2POg24/oardefault.jpg102.5 KiB90.9 KiB
Vertical video titled 'How Mass. scientists helped Artemis II photos get to Ear… div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA > img
i.ytimg.com/vi/5VZdHKUJzqA/oardefault.jpg97.5 KiB86.5 KiB
Play WBUR's daily mini crossword li > article > a#section-features-fig-1 > img.card-fig
media.wbur.org/config/2024/10/10/crossword_no_logo_3-2.png71.1 KiB69.5 KiB
Non-Event celebrates 25 years of bringing experimental music to Boston li > article > a#section-features-fig-2 > img.card-fig
/wp/2026/04/EvicshenCursedImageKellyBrayCityofBoston-Arts...75.1 KiB65.4 KiB
In this undated photo provided by the U.S. Centers for Disease Control and Prev… div.card-inner > div.card-overlap--flush > a#section-overlap-fig-7 > img.card-fig
media.wbur.org/wp/2018/05/AP_17228520331491-1000x646.jpg56.9 KiB33.6 KiB
Harvard graduate students picket as union goes on strike li > article > a#section-features-fig-1 > img.card-fig
media.wbur.org/wp/2026/04/0421_harvardgrads-2-400x218.jpg44.7 KiB33.1 KiB
Photos: Scenes from the 130th Boston Marathon li > article > a#section-features-fig-1 > img.card-fig
media.wbur.org/wp/2026/04/0420_boston-marathon07-400x267.jpg39.4 KiB29.6 KiB
Our 2026 Boston Marathon superlatives, from best costumes to biggest winner li > article > a#section-features-fig-3 > img.card-fig
media.wbur.org/wp/2026/04/0420_boston-marathon08-400x267.jpg36.6 KiB26.9 KiB
What the government can do to help Americans save money li > article > a#section-features-fig-1 > img.card-fig
media.wbur.org/wp/2026/04/AP22291480904406-400x257.jpg35.1 KiB25.0 KiB
'AI Doc' explores promises and risks of rapidly developing artificial intellige… li > article > a#section-features-fig-4 > img.card-fig
media.wbur.org/wp/2026/04/AP25343700283141-400x267.jpg32.1 KiB22.4 KiB
Paul Revere’s midnight ride unfolds in broad daylight — with a police escort li > article > a#section-features-fig-4 > img.card-fig
media.wbur.org/wp/2026/04/America_250_Paul_Revere_26110512488405-400x267.jpg31.3 KiB21.6 KiB
How Boston's World Cup transit pricing compares to other host cities li > article > a#section-features-fig-3 > img.card-fig
media.wbur.org/wp/2026/03/IMG_1105-400x286.jpg30.2 KiB19.7 KiB
'Reading Rainbow' reboot host shares 'the most extraordinary thing I've ever le… li > article > a#section-features-fig-1 > img.card-fig
media.wbur.org/wp/2026/04/NLW-Mychal-ILL-composite.png-400x267.jpg28.5 KiB18.7 KiB
People with heat pumps get a break on electric bills from new Mass. program li > article > a#section-features-fig-2 > img.card-fig
media.wbur.org/wp/2026/04/0320_heat-pump-rates01-400x267.jpg28.0 KiB18.2 KiB
This Conn. dog was a World War I hero. Now Sgt. Stubby is being honored with a … li > article > a#section-features-fig-2 > img.card-fig
media.wbur.org/wp/2026/04/Sgt_Stubby_1-400x267.jpg22.2 KiB12.4 KiB
Apple's Tim Cook to step down as CEO li > article > a#section-features-fig-2 > img.card-fig
media.wbur.org/wp/2026/04/AP25255515419094-400x267.jpg21.4 KiB11.6 KiB
Artichokes and asparagus star in spring specialty recipes li > article > a#section-features-fig-3 > img.card-fig
media.wbur.org/wp/2026/04/IMG_1534-400x261.jpg20.7 KiB10.8 KiB
Imam Omar Suleiman reflects on the rise in Islamophobia triggered by the U.S.-I… li > article > a#section-features-fig-3 > img.card-fig
media.wbur.org/wp/2026/04/AP20135632607112-400x245.jpg17.4 KiB6.8 KiB
'Michael' is a troublingly untroubled biopic of the late King of Pop li > article > a#section-features-fig-3 > img.card-fig
media.wbur.org/wp/2026/04/153-pbw-1180-cin-v0018-comp-g-r709-1025-400x216.jpg16.1 KiB4.7 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-20-IMG
nodeLabel: The Harold F. Johnson Library at the center of Hampshire College's campus. (Rob…
path: 1,HTML,1,BODY,0,DIV,1,DIV,1,MAIN,0,DIV,3,SECTION,0,ARTICLE,0,DIV,0,DIV,0,A,0,PICTURE,0,IMG
selector: div.Horizontal_flush__ur8Uc > a#section-horizontal-fig-1 > picture > img
snippet: <img src="https://media.wbur.org/wp/2026/04/1004_hampshire-05-1000x668.jpg" alt="The Harold F. Johnson Library at the center of Hampshire College's campus.…">

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
value: No additional origins are good candidates for preconnecting

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: 490 ms
URLTime Spent
wbur.org/490 ms
www.wbur.org/0.0 ms

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: 0.0 ms 13.1 KiB
URLTransfer SizeEst Savings
static.wbur.org/app/prod/_next/static/css/101908e8ad467ff4.css17.7 KiB13.1 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: 0.0 ms 662.6 KiB
URLTransfer SizeEst Savings
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js361.8 KiB177.3 KiB
/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31...187.4 KiB95.8 KiB
www.googletagmanager.com/gtag/js?id=G-4MF3ZX6E9G&cx=c&gtm=4e64h1164.6 KiB67.2 KiB
/gtm.js?id=GTM-PCRWWRR&gtm_auth=uz7j-0KOdZdWUQEvD6ZYtA&gt...164.1 KiB65.4 KiB
www.googletagmanager.com/gtag/js?id=G-XGZ99F1SED&cx=c&gtm=4e64h1146.7 KiB63.5 KiB
www.googletagmanager.com/gtm.js?id=GTM-W6G65JFZ134.1 KiB61.9 KiB
www.googletagmanager.com/gtag/js?id=AW-18020114546&cx=c&gtm=4e64h1136.4 KiB60.8 KiB
pagead2.googlesyndication.com/pagead/js/adsbygoogle.js54.2 KiB36.7 KiB
connect.facebook.net/en_US/fbevents.js96.5 KiB33.9 KiB

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
media.wbur.org/config/2024/10/10/news_quiz_no_logo_3-2.png696.5 KiB
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362.4 KiB
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js361.9 KiB
i.ytimg.com/vi/oVfr1cqdkVU/oardefault.jpg318.5 KiB
tpc.googlesyndication.com/simgad/13240187096411075953?308.6 KiB
i.ytimg.com/vi/U5rGcUER9Gg/oardefault.jpg303.2 KiB
i.ytimg.com/vi/hAn1UEPe64A/oardefault.jpg265.5 KiB
i.ytimg.com/vi/L9f4dp6tGTM/oardefault.jpg264.2 KiB
i.ytimg.com/vi/RKjtN39ab5c/oardefault.jpg226.1 KiB
i.ytimg.com/vi/D6xEeYmdFZQ/oardefault.jpg218.1 KiB

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

●Max Potential First Input Delay 90 ms
●Layout shift culprits
●Optimize DOM size
●LCP breakdown
●Modern HTTP
●Render blocking requests
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 14 user timings
●JavaScript execution time 0.9 s
●Minimizes main-thread work 1.6 s
●Avoid long main-thread tasks 6 long tasks found
●Avoid non-composited animations 1 animated element found
●Image elements have explicit `width` and `height`
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 110 ms
●Server Backend Latencies 210 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 100 ms
●Avoid large layout shifts 5 layout shifts found
○INP breakdown
91

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

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.view > section.section--island > div.VerticalVideo_carousel-container___9Z8s > button.VerticalVideo_navigation-arrow__N_WUp div.view > section.section--island > div.VerticalVideo_carousel-container___9Z8s > button.VerticalVideo_navigation-arrow__N_WUp

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.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
SUPPORT WBUR li > article > div.uw > p.bp-label
SUPPORT WBUR li > article > div.uw > p.bp-label
Arts & Culture div.card-meta > span > div.card-meta-item > a.card-source-link
03:51 div.card-text > div.card-meta > span > span.card-meta-item
SUPPORT WBUR li > article > div.uw > p.bp-label
21 article > a.card-link > time.event-date_event-date__nwTMi > div.event-date_event-date--date__zMHXB
22 article > a.card-link > time.event-date_event-date__nwTMi > div.event-date_event-date--date__zMHXB
25 article > a.card-link > time.event-date_event-date__nwTMi > div.event-date_event-date--date__zMHXB
30 article > a.card-link > time.event-date_event-date__nwTMi > div.event-date_event-date--date__zMHXB
SUPPORT WBUR div.section--bp > div.uw > div.bp-inner > p.bp-label
Add WBUR to your morning routine div.EmailForm_sub__y_QTc > div.EmailForm_inner__mGUKM > div.EmailForm_left__RhX3z > p

These are opportunities to improve the legibility of your content.

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
Harvard graduate students picket as union goes on strike ul.CardWrapper_four__Yov2b > li > article > h3.card-hdr
Sign up for WBUR Today div.EmailForm_sub__y_QTc > div.EmailForm_inner__mGUKM > div.EmailForm_left__RhX3z > 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
01:20 Meet the multi-marathoners section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
01:12 The 2026 Boston Marathon section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
01:47 Bobbi Gibb gets a statue on the Boston Marathon course section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
02:01 Boston police officer faces manslaughter charge in fatal shooting section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
02:35 Romney returns to Mass. 20 years after 'Romneycare' passage section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
00:34 The Duck Boat Challenge on Boston Common section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
02:33 Boston Public Schools hadn't until now fined bus vendor for thousands of … section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
00:43 How Mass. scientists helped Artemis II photos get to Earth section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
00:48 Mayor Wu talks city finances section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
00:34 Thousands in Boston join third national 'No Kings' protest section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
00:28 Become a WBUR member today! section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
01:20 This phone bridges a generational divide section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
00:45 Jordan Walsh hates losing section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
01:12 Is this the Lego of the future? section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
01:35 The story behind Evacuation Day section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
01:26 Isabella Stewart Gardner Museum solves a new mystery section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
01:22 How the Civil War shaped voting by mail section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
01:09 Flavor Flav invited women Olympic medalists to celebrate with him in Las … section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
01:48 Mayor Wu talks changes to Boston's snow cleanup section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
00:43 Blizzard impacts on Cape Cod section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
00:16 Skiing in a Boston blizzard section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
00:25 Testing out Boston's winter Ferris wheel section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
00:59 Why giant eyes and tentacles are up in downtown Boston section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
01:20 Oldest known whale song recordings discovered in Cape Cod archives section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
00:46 Robert Duvall on his life in film section.section--island > div.VerticalVideo_carousel-container___9Z8s > div.VerticalVideo_carousel-wrapper__Th40S > div.VerticalVideo_carousel-item___DbXA
○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
●Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Image elements have `[alt]` attributes
●Form elements have associated labels
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●`button`, `link`, and `menuitem` elements have accessible names
●ARIA attributes are used as specified for the element's role
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●Document has a `<title>` element
●`<frame>` or `<iframe>` elements have a title
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links are distinguishable without relying on color.
●Links have a discernible name
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Touch targets have sufficient size and spacing.
●Skip links are focusable.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
○`[accesskey]` values are unique
○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
○`[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.
○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.
81

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
●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
●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
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
92

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
youtube.com/playlist?list=PLYlGB8DA1BExd3p5cWP-lCeM0nwE0lA2w&si=t04qYfIcnRjv_aACMore
www.wbur.org/diversionsMore

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
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`
○robots.txt is valid

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