Lighthouse Mobile

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
cdn.optimizely.com/js/29864900014.js	120.0 s	141.2 KiB
connect.facebook.net/en_US/fbevents.js	1200.0 s	96.6 KiB
edge.fullstory.com/s/fs.js	3600.0 s	79.8 KiB
cdn.cookielaw.org/scripttemplates/202602.1.0/otBannerSdk.js	86400.0 s	129.0 KiB
cdn.evgnet.com/beacon/emdmilliporecorp/prod/scripts/evergage.min.js	120.0 s	49.3 KiB
tag.demandbase.com/bccb5bc7.min.js	3600.0 s	50.1 KiB
d1igp3oop3iho5.cloudfront.net/v2/J4HDbvH5rl2QuF5CfIvJZg/zaius-min.js	0.0 ms	38.1 KiB
/logos/e0f8496a-cdec-4d5c-8c10-313a8c4189a9/073ad8c0-9e7a...	86400.0 s	80.3 KiB
maestro.my.site.com/ESWMessagingService1730092965382/assets/js/bootstrap.min.js	16.0 s	26.5 KiB
scripts.clarity.ms/0.8.59/clarity.js	0.0 ms	26.1 KiB
/signals/config/1671231489763896?v=2.9.303&r=stable&domai...	1200.0 s	23.3 KiB
www.redditstatic.com/ads/pixel.js	60.0 s	19.0 KiB
rs.fullstory.com/rec/integrations?OrgId=15R99F&isInFrame=false&isNative=false	0.0 ms	16.8 KiB
edge.fullstory.com/datalayer/v4/latest.js	3600.0 s	13.5 KiB
snap.licdn.com/li.lms-analytics/insight.min.js	86400.0 s	18.7 KiB
bat.bing.com/p/insights/s/0.8.59	86400.0 s	15.6 KiB
www.sigmaaldrich.com/akam/13/6efc6afe	21600.0 s	9.2 KiB
/SIE/?Q_ZID=ZN_6PrR1PrkKGQdoc6	3600.0 s	4.6 KiB
cdn.cookielaw.org/scripttemplates/otSDKStub.js	86400.0 s	9.1 KiB
/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERS...	604800.0 s	35.8 KiB
/dxjsmodule/CoreModule.js?Q_CLIENTVERSION=2.46.0&Q_CLIENT...	604800.0 s	30.9 KiB
/dxjsmodule/FeedbackButtonModule.js?Q_CLIENTVERSION=2.46....	604800.0 s	19.4 KiB
/dxjsmodule/37.7ea1ffe71ad8c0799cc1.chunk.js?Q_CLIENTVERS...	604800.0 s	18.6 KiB
/deepweb/assets/sigmaaldrich/marketing/global/images/icon...	1296000.0 s	14.1 KiB
/api/v3/ip.json?key=IOrVTGsJH0Xu0nVmm7XWY3q2bxdFFJNRl3vrS...	0.0 ms	1.3 KiB
cdn.cookielaw.org/logos/static/powered_by_logo.svg	86400.0 s	2.6 KiB
/dxjsmodule/1.bc67e778235741631577.chunk.js?Q_CLIENTVERSI...	604800.0 s	7.1 KiB
/rp.gif?ts=1776900224793&id=t2_9szsajw&event=PageVisit&m....	0.0 ms	666 B
/deepweb/assets/sigmaaldrich/marketing/global/images/home...	1296000.0 s	5.8 KiB
/deepweb/assets/sigmaaldrich/marketing/global/images/home...	1296000.0 s	5.6 KiB
/deepweb/assets/sigmaaldrich/marketing/global/images/home...	1296000.0 s	5.5 KiB
/deepweb/assets/sigmaaldrich/marketing/global/images/home...	1296000.0 s	5.4 KiB
/deepweb/assets/sigmaaldrich/marketing/global/images/home...	1296000.0 s	5.3 KiB
/deepweb/assets/sigmaaldrich/marketing/global/images/home...	1296000.0 s	5.2 KiB
/deepweb/assets/sigmaaldrich/marketing/global/images/home...	1296000.0 s	5.2 KiB
/deepweb/assets/sigmaaldrich/marketing/global/images/home...	1296000.0 s	5.2 KiB
/deepweb/assets/sigmaaldrich/marketing/global/images/home...	1296000.0 s	5.2 KiB
/deepweb/assets/sigmaaldrich/marketing/global/images/home...	1296000.0 s	5.1 KiB
/deepweb/assets/sigmaaldrich/marketing/global/images/home...	1296000.0 s	5.1 KiB
/deepweb/assets/sigmaaldrich/marketing/global/images/home...	1296000.0 s	5.0 KiB
partners.tremorhub.com/sync?UIDM=690f7c5a-9b95-4a6c-87b5-6287c0e8186e	0.0 ms	391 B
cdn3.optimizely.com/js/geo4.js	0.0 ms	307 B
/collect?v=2&fmt=js&pid=9130&time=1776900224766&li_adsId=...	0.0 ms	271 B
/deepweb/assets/sigmaaldrich/marketing/global/images/icon...	1296000.0 s	1.5 KiB
/dxjsmodule/7.f7df015b06d8a90ce822.chunk.js?Q_CLIENTVERSI...	604800.0 s	1.4 KiB
/deepweb/assets/sigmaaldrich/marketing/global/images/icon...	1296000.0 s	1.2 KiB
/deepweb/assets/sigmaaldrich/marketing/global/images/icon...	1296000.0 s	1.1 KiB
/deepweb/assets/sigmaaldrich/marketing/global/images/icon...	1296000.0 s	1.1 KiB
/deepweb/assets/sigmaaldrich/marketing/global/images/icon...	1296000.0 s	987 B
/tr/?id=1671231489763896&ev=PageView&dl=https%3A%2F%2Fwww...	0.0 ms	16 B

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]

items: [map[node:map[type:text value:Total] score:0.148204] map[score:0.079217 subItems:map[items:[map[cause:Unsized image element]] type:subitems]] map[node:map[boundingRect:map[bottom:823 height:581 left:0 right:412 top:242 width:412] lhId:page-3-DIV nodeLabel:Cookie Disclaimer We use cookies in our website to give you the most relevant e… path:1,HTML,1,BODY,8,DIV,1,DIV selector:body > div#onetrust-consent-sdk > div#onetrust-banner-sdk snippet:<div id="onetrust-banner-sdk" class="otFlat bottom vertical-align-content ot-buttons-fw" tabindex="0" style="bottom: 0px;"> type:node] score:0.015473 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:863 height:86 left:46 right:132 top:777 width:86] lhId:page-7-IMG nodeLabel:Sigma-Aldrich path:1,HTML,1,BODY,1,DIV,0,DIV,3,MAIN,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,4,DIV,0,DIV,0,DIV,0,DIV,0,A,0,DIV,0,DIV,0,IMG selector:a#product-card-Z359998SIGMA-top deals > div.css-1a4rhsa-mainContent-mainContentHeight > div.css-giazc0-mainContentImage > img.css-6zqear-image snippet:<img class="css-6zqear-image" src="/assets/images/sigmaaldrich-no-image/sigmaaldrich-no-image_w640.png" alt="Sigma-Aldrich" width="112" height="50" draggable="false"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:823 height:581 left:0 right:412 top:242 width:412] lhId:page-3-DIV nodeLabel:Cookie Disclaimer We use cookies in our website to give you the most relevant e… path:1,HTML,1,BODY,8,DIV,1,DIV selector:body > div#onetrust-consent-sdk > div#onetrust-banner-sdk snippet:<div id="onetrust-banner-sdk" class="otFlat bottom vertical-align-content ot-buttons-fw" tabindex="0" style="bottom: 0px;"> type:node] score:0.011937 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:1295 height:37 left:20 right:56 top:1259 width:36] lhId:page-6-IMG nodeLabel:Certified Reference Materials path:1,HTML,1,BODY,1,DIV,0,DIV,3,MAIN,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,2,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,A,0,DIV,0,DIV,0,IMG selector:a.css-r7o3yn-itemTitle > div.css-1m6aaa5-flexWrapper > div.css-1unxnfm-imageHeight > img.css-15lg9ru-imgResponsive snippet:<img src="/deepweb/assets/sigmaaldrich/marketing/global/images/home/category/pictogr…" class="css-15lg9ru-imgResponsive" alt="Certified Reference Materials"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:823 height:581 left:0 right:412 top:242 width:412] lhId:page-3-DIV nodeLabel:Cookie Disclaimer We use cookies in our website to give you the most relevant e… path:1,HTML,1,BODY,8,DIV,1,DIV selector:body > div#onetrust-consent-sdk > div#onetrust-banner-sdk snippet:<div id="onetrust-banner-sdk" class="otFlat bottom vertical-align-content ot-buttons-fw" tabindex="0" style="bottom: 0px;"> type:node] score:0.01063] map[node:map[boundingRect:map[bottom:823 height:581 left:0 right:412 top:242 width:412] lhId:page-3-DIV nodeLabel:Cookie Disclaimer We use cookies in our website to give you the most relevant e… path:1,HTML,1,BODY,8,DIV,1,DIV selector:body > div#onetrust-consent-sdk > div#onetrust-banner-sdk snippet:<div id="onetrust-banner-sdk" class="otFlat bottom vertical-align-content ot-buttons-fw" tabindex="0" style="bottom: 0px;"> type:node] score:0.007282]]

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.

URL	Est Savings
/static/fonts/Noto_Sans/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iP...	340 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:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:0.177 source:map[column:21 line:447 type:source-location url:https://www.sigmaaldrich.com/ruxitagentjs_ICA15789NPRTUVXfhqrux_10335260306043831.js urlProvider:network]]]

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

items: [map[reflowTime:1.408 source:map[column:291 line:367 type:source-location url:https://www.sigmaaldrich.com/ruxitagentjs_ICA15789NPRTUVXfhqrux_10335260306043831.js urlProvider:network]] map[reflowTime:44.376 source:map[type:text value:[unattributed]]]]

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]

items: [map[duration:1747.229 label:Time to first byte subpart:timeToFirstByte] map[duration:3676.557 label:Element render delay subpart:elementRenderDelay]]

lhId: page-0-DIV

nodeLabel: We use cookies in our website to give you the most relevant experience. By clic…

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

selector: div.ot-sdk-row > div#onetrust-group-container > div#onetrust-policy > div#onetrust-policy-text

snippet: <div id="onetrust-policy-text">

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
www.sigmaaldrich.com/tmp/aem.e2668.css	18.3 KiB
www.sigmaaldrich.com/ruxitagentjs_ICA15789NPRTUVXfhqrux_10335260306043831.js	127.3 KiB	1.7 s
www.sigmaaldrich.com/static/fonts/mkgaa.css	555 B
cdn.optimizely.com/js/29864900014.js	141.2 KiB	2.0 s
cdn.cookielaw.org/scripttemplates/otSDKStub.js	9.1 KiB	767 ms
www.sigmaaldrich.com/static/fonts/noto-sans.css	1.1 KiB

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
Sigma-Aldrich `a#product-card-Z359998SIGMA-top deals > div.css-1a4rhsa-mainContent-mainContentHeight > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/assets/images/sigmaaldrich-no-image/sigmaaldrich-no-imag...	7.8 KiB	7.3 KiB
Ethyl alcohol, Pure 200 proof Molecular Biology `a#product-card-E7023SIGALD-popular products > div.css-1ppc2cz-mainContent > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/deepweb/assets/sigmaaldrich/product/structures/429/462/0...	6.9 KiB	6.6 KiB

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

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 1.8 s

URL	Time Spent
sigmaaldrich.com/	805 ms
www.sigmaaldrich.com/	969 ms
www.sigmaaldrich.com/US/en	0.0 ms

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
www.sigmaaldrich.com/US/en	1.3 s

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.

Element	Layout shift score
	0.079
Cookie Disclaimer We use cookies in our website to give you the most relevant e… `body > div#onetrust-consent-sdk > div#onetrust-banner-sdk`	0.015
Cookie Disclaimer We use cookies in our website to give you the most relevant e… `body > div#onetrust-consent-sdk > div#onetrust-banner-sdk`	0.012
Cookie Disclaimer We use cookies in our website to give you the most relevant e… `body > div#onetrust-consent-sdk > div#onetrust-banner-sdk`	0.011
Cookie Disclaimer We use cookies in our website to give you the most relevant e… `body > div#onetrust-consent-sdk > div#onetrust-banner-sdk`	0.007
Cookie Disclaimer We use cookies in our website to give you the most relevant e… `body > div#onetrust-consent-sdk > div#onetrust-banner-sdk`	0.007
Cookie Disclaimer We use cookies in our website to give you the most relevant e… `body > div#onetrust-consent-sdk > div#onetrust-banner-sdk`	0.006
Cookie Disclaimer We use cookies in our website to give you the most relevant e… `body > div#onetrust-consent-sdk > div#onetrust-banner-sdk`	0.004
Cookie Disclaimer We use cookies in our website to give you the most relevant e… `body > div#onetrust-consent-sdk > div#onetrust-banner-sdk`	0.003
Cookie Disclaimer We use cookies in our website to give you the most relevant e… `body > div#onetrust-consent-sdk > div#onetrust-banner-sdk`	0.003
Barcode Scanner `div.css-vuaor4-root > header > div.css-60ljjr-headerTop > button.MuiButtonBase-root`	0.000
Barcode Scanner `div.css-vuaor4-root > header > div.css-60ljjr-headerTop > button.MuiButtonBase-root`	0.000

Diagnostics

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 4.1 s 1.3 MiB

URL	Transfer Size	Est Savings
www.sigmaaldrich.com/_next/static/chunks/pages/_app-e8d8f0583ad6d04c.js	558.8 KiB	259.8 KiB
www.sigmaaldrich.com/_next/static/chunks/8669-5cfc2e3fd97aca7a.js	137.5 KiB	115.3 KiB
www.sigmaaldrich.com/_next/static/chunks/4768-9da82a5f9303cd97.js	172.0 KiB	110.5 KiB
www.sigmaaldrich.com/_next/static/chunks/main-9b669c732468f591.js	107.1 KiB	85.1 KiB
cdn.cookielaw.org/scripttemplates/202602.1.0/otBannerSdk.js	128.8 KiB	68.6 KiB
www.googletagmanager.com/gtag/destination?id=DC-11536248&cx=c&gtm=4e64k1	129.7 KiB	62.3 KiB
www.googletagmanager.com/gtag/destination?id=DC-15223238&cx=c&gtm=4e64k1	129.1 KiB	62.1 KiB
www.googletagmanager.com/gtag/js?id=G-BQZS3WQYGJ&cx=c&gtm=4e64k1	165.4 KiB	60.9 KiB
www.googletagmanager.com/gtag/destination?id=AW-497007017&cx=c&gtm=4e64k1	140.8 KiB	60.0 KiB
www.googletagmanager.com/gtag/destination?id=AW-1034663491&cx=c&gtm=4e64k1	133.9 KiB	54.7 KiB
/gtm.js?id=GTM-TXMJ2GG&gtm_auth=&gtm_preview=&gtm_cookies...	205.9 KiB	48.6 KiB
www.sigmaaldrich.com/ruxitagentjs_ICA15789NPRTUVXfhqrux_10335260306043831.js	126.8 KiB	47.1 KiB
connect.facebook.net/en_US/fbevents.js	96.5 KiB	36.9 KiB
tag.demandbase.com/bccb5bc7.min.js	49.5 KiB	36.7 KiB
www.sigmaaldrich.com/_next/static/chunks/4958-9277997c572274af.js	52.2 KiB	34.7 KiB
www.sigmaaldrich.com/_next/static/chunks/9200-17489b815baf5f91.js	37.5 KiB	30.6 KiB
cdn.optimizely.com/js/29864900014.js	140.6 KiB	28.9 KiB
edge.fullstory.com/s/fs.js	79.2 KiB	27.9 KiB
cdn.evgnet.com/beacon/emdmilliporecorp/prod/scripts/evergage.min.js	48.7 KiB	24.6 KiB
maestro.my.site.com/ESWMessagingService1730092965382/assets/js/bootstrap.min.js	26.1 KiB	22.5 KiB
d1igp3oop3iho5.cloudfront.net/v2/J4HDbvH5rl2QuF5CfIvJZg/zaius-min.js	37.7 KiB	21.5 KiB
/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERS...	35.7 KiB	20.9 KiB
/dxjsmodule/CoreModule.js?Q_CLIENTVERSION=2.46.0&Q_CLIENT...	30.9 KiB	20.9 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Total CPU Time	Script Evaluation	Script Parse
www.sigmaaldrich.com/_next/static/chunks/framework-8593b37603e77b1e.js	7.2 s	6.2 s	45 ms
Unattributable	2.0 s	102 ms	0.0 ms
www.sigmaaldrich.com/ruxitagentjs_ICA15789NPRTUVXfhqrux_10335260306043831.js	2.0 s	1.5 s	50 ms
www.sigmaaldrich.com/US/en	1.8 s	267 ms	12 ms
/gtm.js?id=GTM-TXMJ2GG&gtm_auth=&gtm_preview=&gtm_cookies...	1.8 s	1.5 s	121 ms
www.googletagmanager.com/gtag/destination?id=DC-11536248&cx=c&gtm=4e64k1	1.7 s	1.6 s	41 ms
edge.fullstory.com/s/fs.js	1.1 s	849 ms	36 ms
www.sigmaaldrich.com/_next/static/chunks/pages/_app-e8d8f0583ad6d04c.js	967 ms	636 ms	330 ms
/_next/static/chunks/pages/[country]/[language]-00abce956...	952 ms	891 ms	2.9 ms
cdn.optimizely.com/js/29864900014.js	445 ms	355 ms	89 ms
www.googletagmanager.com/gtag/js?id=G-BQZS3WQYGJ&cx=c&gtm=4e64k1	376 ms	302 ms	68 ms
cdn.evgnet.com/beacon/emdmilliporecorp/prod/scripts/evergage.min.js	354 ms	312 ms	26 ms
www.sigmaaldrich.com/_next/static/chunks/8912.ea5cf2dd607fc880.js	269 ms	263 ms	4.4 ms
www.sigmaaldrich.com/_next/static/chunks/7855.295cd659ed2e9f06.js	263 ms	245 ms	3.0 ms
tag.demandbase.com/bccb5bc7.min.js	258 ms	210 ms	39 ms
cdn.cookielaw.org/scripttemplates/otSDKStub.js	235 ms	225 ms	3.4 ms
www.googletagmanager.com/gtag/destination?id=AW-497007017&cx=c&gtm=4e64k1	221 ms	173 ms	45 ms
www.sigmaaldrich.com/_next/static/chunks/main-9b669c732468f591.js	221 ms	154 ms	48 ms
scripts.clarity.ms/0.8.59/clarity.js	207 ms	193 ms	10 ms
www.sigmaaldrich.com/_next/static/chunks/3418-773e2e294fe4bbe8.js	206 ms	157 ms	14 ms
www.googletagmanager.com/gtag/destination?id=AW-1034663491&cx=c&gtm=4e64k1	202 ms	152 ms	47 ms
www.googletagmanager.com/gtag/destination?id=DC-15223238&cx=c&gtm=4e64k1	201 ms	156 ms	42 ms
/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERS...	197 ms	165 ms	16 ms
connect.facebook.net/en_US/fbevents.js	172 ms	126 ms	44 ms
www.sigmaaldrich.com/akam/13/6efc6afe	154 ms	142 ms	4.9 ms
d1igp3oop3iho5.cloudfront.net/v2/J4HDbvH5rl2QuF5CfIvJZg/zaius-min.js	140 ms	120 ms	16 ms
www.sigmaaldrich.com/_next/static/chunks/5423.af62caabb5d1f539.js	135 ms	128 ms	4.5 ms
cdn3.optimizely.com/js/geo4.js	126 ms	112 ms	0.4 ms
www.sigmaaldrich.com/_next/static/chunks/8934.0b6340aa767c07ea.js	122 ms	121 ms	0.5 ms
cdn.cookielaw.org/scripttemplates/202602.1.0/otBannerSdk.js	98 ms	34 ms	63 ms
www.sigmaaldrich.com/_next/static/chunks/4768-9da82a5f9303cd97.js	97 ms	5.0 ms	89 ms
edge.fullstory.com/datalayer/v4/latest.js	88 ms	80 ms	6.4 ms
/dxjsmodule/FeedbackButtonModule.js?Q_CLIENTVERSION=2.46....	83 ms	60 ms	8.5 ms
/signals/config/1671231489763896?v=2.9.303&r=stable&domai...	74 ms	62 ms	11 ms
bat.bing.com/bat.js	72 ms	42 ms	27 ms
snap.licdn.com/li.lms-analytics/insight.min.js	69 ms	60 ms	7.2 ms
www.redditstatic.com/ads/pixel.js	69 ms	58 ms	8.5 ms
www.sigmaaldrich.com/_next/static/chunks/8669-5cfc2e3fd97aca7a.js	68 ms	1.2 ms	66 ms
www.sigmaaldrich.com/_next/static/chunks/8737-1e7bc9d411359d8c.js	64 ms	3.4 ms	2.2 ms
bat.bing.com/p/insights/s/0.8.59	64 ms	56 ms	5.5 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

Category	Time Spent
Script Evaluation	18.3 s
Other	2.9 s
Script Parsing & Compilation	1.7 s
Style & Layout	1.2 s
Garbage Collection	614 ms
Parse HTML & CSS	502 ms
Rendering	349 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reason	Failure type
Pages with cache-control:no-store header cannot enter back/forward cache.	Actionable
Pages whose main resource has cache-control:no-store cannot enter back/forward cache.	Not actionable
Back/forward cache is disabled because some JavaScript network request received resource with Cache-Control: no-store header.	Not actionable

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 2.2 KiB

URL	Transfer Size	Est Savings
.css-rqv7gq-body { flex: 1 0 auto; } …	22.3 KiB	2.2 KiB

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 10.3 KiB

URL	Transfer Size	Est Savings
cdn.evgnet.com/beacon/emdmilliporecorp/prod/scripts/evergage.min.js	48.7 KiB	5.9 KiB
rs.fullstory.com/rec/integrations?OrgId=15R99F&isInFrame=false&isNative=false	16.7 KiB	4.4 KiB

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 57.8 KiB

URL	Transfer Size	Est Savings
.css-rqv7gq-body { flex: 1 0 auto; } …	22.3 KiB	20.6 KiB
	22.6 KiB	20.1 KiB
www.sigmaaldrich.com/tmp/aem.e2668.css	17.9 KiB	17.1 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.

URL	Transfer Size
www.sigmaaldrich.com/_next/static/chunks/pages/_app-e8d8f0583ad6d04c.js	562.3 KiB
www.sigmaaldrich.com/US/en	240.7 KiB
/gtm.js?id=GTM-TXMJ2GG&gtm_auth=&gtm_preview=&gtm_cookies...	206.3 KiB
www.sigmaaldrich.com/_next/static/chunks/4768-9da82a5f9303cd97.js	172.4 KiB
www.googletagmanager.com/gtag/js?id=G-BQZS3WQYGJ&cx=c&gtm=4e64k1	165.4 KiB
cdn.optimizely.com/js/29864900014.js	141.2 KiB
www.googletagmanager.com/gtag/destination?id=AW-497007017&cx=c&gtm=4e64k1	140.8 KiB
www.sigmaaldrich.com/_next/static/chunks/8669-5cfc2e3fd97aca7a.js	137.8 KiB
www.googletagmanager.com/gtag/destination?id=AW-1034663491&cx=c&gtm=4e64k1	133.9 KiB
www.googletagmanager.com/gtag/destination?id=DC-11536248&cx=c&gtm=4e64k1	129.8 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
Certified Reference Materials `a.css-r7o3yn-itemTitle > div.css-1m6aaa5-flexWrapper > div.css-1unxnfm-imageHeight > img.css-15lg9ru-imgResponsive`	/deepweb/assets/sigmaaldrich/marketing/global/images/home...
Microbial Filtration `a.css-r7o3yn-itemTitle > div.css-1m6aaa5-flexWrapper > div.css-1unxnfm-imageHeight > img.css-15lg9ru-imgResponsive`	/deepweb/assets/sigmaaldrich/marketing/global/images/home...
Solvents `a.css-r7o3yn-itemTitle > div.css-1m6aaa5-flexWrapper > div.css-1unxnfm-imageHeight > img.css-15lg9ru-imgResponsive`	/deepweb/assets/sigmaaldrich/marketing/global/images/home...
Microbial Culture Media `a.css-r7o3yn-itemTitle > div.css-1m6aaa5-flexWrapper > div.css-1unxnfm-imageHeight > img.css-15lg9ru-imgResponsive`	/deepweb/assets/sigmaaldrich/marketing/global/images/home...
Cell Separation Media for Research, Diagnostic & Pharmaceutical Applications `a.css-r7o3yn-itemTitle > div.css-1m6aaa5-flexWrapper > div.css-1unxnfm-imageHeight > img.css-15lg9ru-imgResponsive`	/deepweb/assets/sigmaaldrich/marketing/global/images/home...
Millex<sup>®</sup> Syringe Filters `a.css-r7o3yn-itemTitle > div.css-1m6aaa5-flexWrapper > div.css-1unxnfm-imageHeight > img.css-15lg9ru-imgResponsive`	/deepweb/assets/sigmaaldrich/marketing/global/images/home...
Glassware `a.css-r7o3yn-itemTitle > div.css-1m6aaa5-flexWrapper > div.css-1unxnfm-imageHeight > img.css-15lg9ru-imgResponsive`	/deepweb/assets/sigmaaldrich/marketing/global/images/home...
Pathogen Screening Kits, Instruments & Disposables `a.css-r7o3yn-itemTitle > div.css-1m6aaa5-flexWrapper > div.css-1unxnfm-imageHeight > img.css-15lg9ru-imgResponsive`	/deepweb/assets/sigmaaldrich/marketing/global/images/home...
Amicon<sup>®</sup> Centrifugals `a.css-r7o3yn-itemTitle > div.css-1m6aaa5-flexWrapper > div.css-1unxnfm-imageHeight > img.css-15lg9ru-imgResponsive`	/deepweb/assets/sigmaaldrich/marketing/global/images/home...
Millipore<sup>®</sup> Filter Membranes `a.css-r7o3yn-itemTitle > div.css-1m6aaa5-flexWrapper > div.css-1unxnfm-imageHeight > img.css-15lg9ru-imgResponsive`	/deepweb/assets/sigmaaldrich/marketing/global/images/home...
Milli-Q<sup>®</sup> Lab Water Purification Consumables `a.css-r7o3yn-itemTitle > div.css-1m6aaa5-flexWrapper > div.css-1unxnfm-imageHeight > img.css-15lg9ru-imgResponsive`	/deepweb/assets/sigmaaldrich/marketing/global/images/home...
Greener Alternative Products `a.css-r7o3yn-itemTitle > div.css-1m6aaa5-flexWrapper > div.css-1unxnfm-imageHeight > img.css-15lg9ru-imgResponsive`	/deepweb/assets/sigmaaldrich/marketing/global/images/home...

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

●Optimize DOM size

●Modern HTTP

●Optimize viewport for mobile

●User Timing marks and measures 30 user timings

●Avoid long main-thread tasks 20 long tasks found

●Avoid non-composited animations 2 animated elements found

●Network Requests

●Network Round Trip Times 60 ms

●Server Backend Latencies 210 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

○INP breakdown

○LCP request discovery

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
Clear Search `div.css-4w7u61-search > div.css-1vwaa72-root > div.css-fttdx6-autoSuggestInputWrapper > div.MuiInputBase-root`

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.

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
Top Deals `div.MuiContainer-root > div.css-1lgx5g-content-productHeroCardContent > div.css-zb6ojd-titleHeader > h3.MuiTypography-root`

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
Privacy Policy `div#onetrust-group-container > div#onetrust-policy > div#onetrust-policy-text > a.ot-cookie-policy-link`

○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

●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

●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●Links have a discernible name

●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

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

●Identical links have the same purpose.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements 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

○Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

○List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

○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

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

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

Best Practices

User Experience

Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Aspect Ratio (Displayed)	Aspect Ratio (Actual)
Sigma-Aldrich `a#product-card-70850MM-new arrivals > div.css-1ppc2cz-mainContent > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/assets/images/sigmaaldrich-no-image/sigmaaldrich-no-imag...	112 x 50 (2.24)	640 x 640 (1.00)
Trifluoroacetic acid ReagentPlus®, 99% `a#product-card-T6508SIGALD-best sellers > div.css-1ppc2cz-mainContent > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/deepweb/assets/sigmaaldrich/product/structures/180/762/6...	112 x 50 (2.24)	640 x 407 (1.57)
Sodium cyanide EMPLURA® `a#product-card-1.06437MM-best sellers > div.css-1ppc2cz-mainContent > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/deepweb/assets/sigmaaldrich/product/images/416/076/53566...	112 x 50 (2.24)	640 x 349 (1.83)
Hydrochloric Acid 31.5-35.5% `a#product-card-HX0603SMM-best sellers > div.css-1ppc2cz-mainContent > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/deepweb/assets/sigmaaldrich/product/structures/546/395/1...	112 x 50 (2.24)	640 x 321 (1.99)
SARS-CoV-2 Receptor Binding Domain Spike protein RBD recombinant, expressed in … `a#product-card-SAE1000SIGMA-best sellers > div.css-1ppc2cz-mainContent > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/deepweb/assets/sigmaaldrich/product/images/175/261/54fae...	112 x 50 (2.24)	528 x 360 (1.47)
3-Guanidinopropionic acid `a#product-card-G6878SIGMA-best sellers > div.css-1ppc2cz-mainContent > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/deepweb/assets/sigmaaldrich/product/structures/145/966/f...	112 x 50 (2.24)	640 x 240 (2.67)
Uranium ICP standard traceable to SRM from NIST UO2(NO3)2 in HNO3 2-3% 10 mg/l … `a#product-card-1.70360MM-best sellers > div.css-1ppc2cz-mainContent > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/deepweb/assets/sigmaaldrich/product/images/904/460/65c1f...	112 x 50 (2.24)	416 x 360 (1.16)
Milli-Q® EQ 7008/16 Ultrapure Water Purification Kit For Milli-Q® EQ … `a#product-card-EQ70XXPKITMM-new arrivals > div.css-1ppc2cz-mainContent > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/deepweb/assets/sigmaaldrich/product/images/203/019/e8a83...	112 x 50 (2.24)	372 x 360 (1.03)
Anti-SEMA5B antibody produced in rabbit Prestige Antibodies® Powered by At… `a#product-card-HPA066548SIGMA-best sellers > div.css-1ppc2cz-mainContent > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/deepweb/assets/sigmaaldrich/product/images/455/304/66916...	112 x 50 (2.24)	360 x 360 (1.00)
Dichloromethane `a#product-card-L090000SIGMA-best sellers > div.css-1ppc2cz-mainContent > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/deepweb/assets/sigmaaldrich/product/structures/344/216/e...	112 x 50 (2.24)	640 x 189 (3.39)
Eppendorf® CellXpert® C170i CO2 Incubator Oxygen control, inner door … `a#product-card-EP6731011085SIGMA-new arrivals > div.css-1ppc2cz-mainContent > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/deepweb/assets/sigmaaldrich/product/images/359/624/25753...	112 x 50 (2.24)	290 x 360 (0.81)
Milli-Q® IX 7010/15 Water Purification Kit For Milli-Q® IX 7010/15 pu… `a#product-card-IX70XXPKITMM-new arrivals > div.css-1ppc2cz-mainContent > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/deepweb/assets/sigmaaldrich/product/images/250/970/166fc...	112 x 50 (2.24)	286 x 360 (0.79)
Elix Essential 15 UV Water Purification System `a#product-card-ZLXEV150WWMM-new arrivals > div.css-1ppc2cz-mainContent > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/deepweb/assets/sigmaaldrich/product/images/212/741/dee8d...	112 x 50 (2.24)	271 x 360 (0.75)
Elix Essential 10 UV Water Purification System `a#product-card-ZLXEV100WWMM-new arrivals > div.css-1ppc2cz-mainContent > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/deepweb/assets/sigmaaldrich/product/images/212/741/dee8d...	112 x 50 (2.24)	271 x 360 (0.75)
Elix Essential 3 UV Water Purification System `a#product-card-ZLXEV030WWMM-new arrivals > div.css-1ppc2cz-mainContent > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/deepweb/assets/sigmaaldrich/product/images/212/741/dee8d...	112 x 50 (2.24)	271 x 360 (0.75)
Milli-Q® IQ 7003/05 Ultrapure Water Purification Kit For Milli-Q® IQ … `a#product-card-IQ700XPKITMM-new arrivals > div.css-1ppc2cz-mainContent > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/deepweb/assets/sigmaaldrich/product/images/648/225/41e48...	112 x 50 (2.24)	242 x 360 (0.67)
Milli-Q® Polishing Kit for Purified Water For Milli-Q® IQ/EQ 7000 ult… `a#product-card-IPAKKIT00MM-new arrivals > div.css-1ppc2cz-mainContent > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/deepweb/assets/sigmaaldrich/product/images/122/703/8b86d...	112 x 50 (2.24)	203 x 360 (0.56)
Milli-Q® IX 7003/05 Water Purification Kit For Milli-Q® IX 7003/05 pu… `a#product-card-IX700XPKITMM-new arrivals > div.css-1ppc2cz-mainContent > div.css-giazc0-mainContentImage > img.css-6zqear-image`	/deepweb/assets/sigmaaldrich/product/images/364/105/6569a...	112 x 50 (2.24)	166 x 360 (0.46)

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Displayed size	Actual size	Expected size
A scientist in a lab coat and blue gloves holds a pipette, alongside graphic il… `div.aem-GridColumn > div.aem-ms-cmp > a > img.aem-ms-promo-banner--image`	/deepweb/assets/sigmaaldrich/marketing/global/images/home...	290 x 217	290 x 217	435 x 326
scientist using lab equipment `div.aem-GridColumn > div.aem-ms-cmp > a > img.aem-ms-promo-banner--image`	/deepweb/assets/sigmaaldrich/marketing/global/images/home...	290 x 217	290 x 217	435 x 326

General

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / Warning	Source
AttributionReporting	www.sigmaaldrich.com/ruxitagentjs_ICA15789NPRTUVXfhqrux_10335260306043831.js line 251, col 106

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Source	Description
	`An unknown error occurred when fetching the script.`
www.sigmaaldrich.com/US/en	`TypeError: Failed to register a ServiceWorker for scope ('https://www.sigmaaldrich.com/') with script ('https://www.sigmaaldrich.com/sw.8a062.js'): An unknown error occurred when fetching the script.`

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Why this matters

Performance issues directly impact user engagement and conversion rates.

●Uses HTTPS

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Page has the HTML doctype

●Properly defines charset

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

●Ensure CSP is effective against XSS attacks

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

○Redirects HTTP traffic to HTTPS

○Use a strong HSTS policy

○Mitigate clickjacking with XFO or CSP

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 destination	Link Text
/US/en/products/molecular-biology-and-functional-genomics...	Learn More
www.sigmaaldrich.com/US/en/campaigns/new-popular-products	Learn More
www.sigmaaldrich.com/US/en/services/recycler-solvent-systems	Learn More

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

Crawling and Indexing

Search engines may use `href` attributes on links to crawl websites. Ensure that the `href` attribute of anchor elements links to an appropriate destination, so more pages of the site can be discovered. Learn how to make links crawlable

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
div.MuiPaper-root > ul.MuiList-root > div.MuiBox-root > a.MuiTypography-root `div.MuiPaper-root > ul.MuiList-root > div.MuiBox-root > a.MuiTypography-root`

If your robots.txt file is malformed, crawlers may not be able to understand how you want your website to be crawled or indexed. Learn more about robots.txt.

Why this matters

Performance issues directly impact user engagement and conversion rates.

To appear in search results, crawlers need access to your app.

○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

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`