Lighthouse Desktop

· 0 checks — Desktop 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.

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.

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:38.013 source:map[column:25125 line:2 type:source-location url:https://wmo.int/core/assets/vendor/jquery/jquery.min.js?v=4.0.0 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:35.814 source:map[column:45355 line:1 type:source-location url:https://wmo.int/core/assets/vendor/jquery/jquery.min.js?v=4.0.0 urlProvider:network]] map[reflowTime:0.434 source:map[column:46159 line:1 type:source-location url:https://wmo.int/core/assets/vendor/jquery/jquery.min.js?v=4.0.0 urlProvider:network]] map[reflowTime:2.07 source:map[column:45377 line:1 type:source-location url:https://wmo.int/core/assets/vendor/jquery/jquery.min.js?v=4.0.0 urlProvider:network]] map[reflowTime:14.455 source:map[type:text value:[unattributed]]] map[reflowTime:0.369 source:map[column:77136 line:1 type:source-location url:https://wmo.int/core/assets/vendor/jquery/jquery.min.js?v=4.0.0 urlProvider:network]] map[reflowTime:0.157 source:map[column:5765 line:5 type:source-location url:https://wmo.int/sites/default/files/js/js_Tm2kJcaIuY7ctfvQK8t4l8XY8EcK8mW-ajujIpz__jE.js?scope=footer&delta=3&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ 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
Three people stand on a seaside balcony at sunset, observing a satellite, ballo… `div.node__content > a.grid > figure.child-object-cover > img`	/sites/default/files/styles/hero_featured_content_x1_760x...	612.6 KiB	576.2 KiB
Satellite image shows a large hurricane with a clear eye, displaying intense re… `div.node__content > a.flex > figure.rounded-lg > img`	/sites/default/files/styles/teaser_1x/public/2026-03/jama...	34.3 KiB	22.6 KiB
Snow-capped mountain peaks rise under a clear blue sky, with rocky slopes and p… `div.node__content > a.flex > figure.rounded-lg > img`	/sites/default/files/styles/teaser_1x/public/2026-03/5459...	34.2 KiB	22.5 KiB
A newborn baby lies on a cloth between an adult woman's legs, with both resting… `div.node__content > a.flex > figure.rounded-lg > img`	/sites/default/files/styles/teaser_1x/public/2026-03/ina-...	30.0 KiB	18.3 KiB
Golden sunlight reflects off gentle ocean waves near the shore at sunrise. Boat… `div.node__content > a.flex > figure.rounded-lg > img`	/sites/default/files/styles/teaser_1x/public/2026-03/5447...	28.3 KiB	16.6 KiB
A person with a bicycle stands on a damaged coastal road, watching large waves … `div.node__content > a.flex > figure.rounded-lg > img`	/sites/default/files/styles/teaser_1x/public/2026-03/5315...	27.5 KiB	15.8 KiB
A large building complex sits on a rocky hillside at sunset, with a sign readin… `div.node__content > a.flex > figure.rounded-lg > img`	/sites/default/files/styles/teaser_1x/public/2026-04/HFxc...	24.3 KiB	13.4 KiB
Cyclone over Pacific. Massive cyclone related to El Nino phenomena swirling ove… `div.node__content > a.grid > figure.child-object-cover > img`	/sites/default/files/styles/hero_featured_content_x1_760x...	47.9 KiB	6.5 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-8-IMG

nodeLabel: Numerous small boats float on a calm body of water, surrounded by distant hills…

path: 1,HTML,1,BODY,5,DIV,0,DIV,1,MAIN,0,DIV,0,DIV,0,ARTICLE,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,ARTICLE,0,DIV,0,A,1,FIGURE,0,IMG

selector: div.node__content > a.grid > figure.child-object-cover > img

snippet: <img srcset="/sites/default/files/styles/hero_featured_content_x1_760x440_/public/2026-…" width="760" height="440" src="/sites/default/files/styles/hero_featured_content_x1_760x440_/public/2026-…" alt="Numerous small boats float on a calm body of water, surrounded by distant …" loading="lazy" typeof="foaf:Image">

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

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/css2?family=Montserrat:wght@200..700&display=swap	1.0 KiB	273 ms
maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css	7.4 KiB	316 ms
/sites/default/files/js/js_Zj7cV17l39XdxS1ZUDiD9HTYes2hA_...	455 B
/sites/default/files/css/css_9vNo4PZdVgz2asaIqmholULao3i1...	22.1 KiB	82 ms
/sites/default/files/css/css_p6inRy1qf3swiqHP1T5AB7IYSfLX...	3.3 KiB
/sites/default/files/css/css_ns5aJ0uhZjJ2-xP5JkiKtW-TCfMC...	1.3 KiB
wmo.int/modules/contrib/google_tag/js/gtag.js?tdsma7	934 B
wmo.int/modules/contrib/google_tag/js/gtm.js?tdsma7	845 B
/sites/default/files/js/js_tPB0X5w-UvQN_62MtIjK3BwaZe6wzQ...	3.3 KiB
/sites/default/files/css/css_qBV16kYwrA6Sb4Hl3zOBjlpAThM5...	2.2 KiB

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
scripts.clarity.ms/0.8.59/clarity.js	86400.0 s	26.2 KiB
static.hotjar.com/c/hotjar-3386775.js?sv=6	60.0 s	6.2 KiB
static.hotjar.com/c/hotjar-3386775.js?sv=7	60.0 s	6.2 KiB

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

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: 40 ms 16.9 KiB

URL	Transfer Size	Est Savings
/sites/default/files/css/css_9vNo4PZdVgz2asaIqmholULao3i1...	21.9 KiB	16.9 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: 40 ms 165.0 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/js?id=G-M3ZTFRL6FX&cx=c&gtm=4e64h1	158.6 KiB	64.9 KiB
www.googletagmanager.com/gtm.js?id=GTM-MWXW8B2	134.7 KiB	62.3 KiB
script.hotjar.com/modules.6a0f3932cb1341a35c18.js	56.1 KiB	37.8 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
World Meteorological Organization `a.h-[3.125rem] > div.flex > div.flex > img`	wmo.int/themes/custom/server_theme/dist/images/logo_en.svg
World Meteorological Organization `div.flex > div.flex > div.flex > img`	wmo.int/themes/custom/server_theme/dist/images/logo_en.svg
World Meteorological Organization `a.h-[3.125rem] > div.flex > div.flex > img`	wmo.int/themes/custom/server_theme/dist/images/logo.svg
div.flex > div.flex > div.flex > img `div.flex > div.flex > div.flex > img`	wmo.int/themes/custom/server_theme/dist/images/logo.svg
Icon `div.flex > div.flex > div.shrink-0 > img`	wmo.int/themes/custom/server_theme/dist/images/location-light.svg
Icon `div.flex > div.flex > div.shrink-0 > img`	wmo.int/themes/custom/server_theme/dist/images/location-light.svg
Icon `div.flex > div.flex > div.shrink-0 > img`	wmo.int/themes/custom/server_theme/dist/images/calendar-light.svg
Icon `div.flex > div.flex > div.shrink-0 > img`	wmo.int/themes/custom/server_theme/dist/images/calendar-light.svg
Icon `div.flex > div.flex > div.shrink-0 > img`	wmo.int/themes/custom/server_theme/dist/images/calendar-light.svg
div.flex > div.mt-auto > a.bg-wmo-red > img.rtl-flip `div.flex > div.mt-auto > a.bg-wmo-red > img.rtl-flip`	wmo.int/themes/custom/server_theme/dist/images/cta-button-round-dark.svg
div.flex > div.mt-auto > a.bg-wmo-red > img.rtl-flip `div.flex > div.mt-auto > a.bg-wmo-red > img.rtl-flip`	wmo.int/themes/custom/server_theme/dist/images/cta-button-round-dark.svg
div.flex > div.mt-auto > a.bg-white > img.rtl-flip `div.flex > div.mt-auto > a.bg-white > img.rtl-flip`	wmo.int/themes/custom/server_theme/dist/images/cta-button-round-light.svg
div.flex > div.mt-auto > a.bg-white > img.rtl-flip `div.flex > div.mt-auto > a.bg-white > img.rtl-flip`	wmo.int/themes/custom/server_theme/dist/images/cta-button-round-light.svg

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

Keep the server response time for the main document short because all other requests depend on it. Learn more about the Time to First Byte metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 1.2 s

URL	Time Spent
wmo.int/	1.3 s

●Time to Interactive 2.4 s

●Layout shift culprits

●Optimize DOM size

●Font display

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Max Potential First Input Delay 50 ms

●Minify CSS

●Minify JavaScript

●Avoids enormous network payloads Total size was 2,286 KiB

●User Timing marks and measures 7 user timings

●JavaScript execution time 0.2 s

●Minimizes main-thread work 0.5 s

●Avoid long main-thread tasks 1 long task found

●Avoid non-composited animations 2 animated elements found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 100 ms

●Server Backend Latencies 150 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Avoid large layout shifts 1 layout shift found

○INP breakdown

100

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.

○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]`s are contained by their required parent element

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

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

●`[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 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.

●`[lang]` attributes have a valid value

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Elements with visible text labels have matching accessible names.

○`[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 buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○Links are distinguishable without relying on color.

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

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

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

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

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Identical links have the same purpose.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

100

Best Practices

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○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`