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Lighthouse Mobile

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

Audit breakdown by category with detailed findings.

29

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
js.hsforms.net/forms/embed/v2.js300.0 s193.7 KiB
i.ytimg.com/vi/Q4csFhDtCt4/hqdefault.jpg7200.0 s44.9 KiB
livesearch-autocomplete.magento-ds.com/v1/LiveSearchAutocomplete.js0.0 ms32.2 KiB
i.ytimg.com/vi/sqTIUvmcUvY/hqdefault.jpg7200.0 s39.8 KiB
i.ytimg.com/vi/hm-n1yeiu6M/hqdefault.jpg7200.0 s35.8 KiB
livesearch-metrics.magento-ds.com/v0/liveSearchMetrics.js0.0 ms19.1 KiB
js.braintreegateway.com/web/3.112.0/js/paypal-checkout.min.js3600.0 s16.5 KiB
js.braintreegateway.com/web/3.112.0/js/client.min.js3600.0 s12.8 KiB
magento-recs-sdk.adobe.net/v2/index.js0.0 ms9.7 KiB
i.ytimg.com/vi/sXuw1smWxhQ/hqdefault.jpg7200.0 s12.0 KiB
commerce.adobedtm.com/v6/ds.min.js0.0 ms8.0 KiB
widget.trustpilot.com/bootstrap/v5/tp.widget.bootstrap.min.js86400.0 s8.1 KiB
rum.hlx.page/.rum/@adobe/helix-rum-js@%5E2/dist/rum-standalone.js3600.0 s2.8 KiB
invitejs.trustpilot.com/tp.min.js86400.0 s4.0 KiB
commerce.adobedtm.com/recommendations/events/v1/recommendationsEvents.min.js0.0 ms1.3 KiB

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:195.977 source:map[column:8495 line:18 type:source-location url:https://www.sparkfun.com/ 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:193.58 source:map[column:63 line:6442 type:source-location url:https://www.sparkfun.com/static/version1775629953/base/Magento/base/default/jquery.js urlProvider:network]] map[reflowTime:0.753 source:map[column:40 line:6295 type:source-location url:https://www.sparkfun.com/static/version1775629953/base/Magento/base/default/jquery.js urlProvider:network]] map[reflowTime:0.548 source:map[column:61 line:6303 type:source-location url:https://www.sparkfun.com/static/version1775629953/base/Magento/base/default/jquery.js urlProvider:network]] map[reflowTime:0.449 source:map[column:55 line:6314 type:source-location url:https://www.sparkfun.com/static/version1775629953/base/Magento/base/default/jquery.js urlProvider:network]] map[reflowTime:2.443 source:map[column:43 line:15 type:source-location url:https://www.sparkfun.com/static/version1775629953/frontend/SparkFun/default/default/js/accessibility/contrast-checker.js urlProvider:network]] map[reflowTime:35.967 source:map[type:text value:[unattributed]]] map[reflowTime:27.389 source:map[column:27 line:6442 type:source-location url:https://www.sparkfun.com/static/version1775629953/base/Magento/base/default/jquery.js urlProvider:network]] map[reflowTime:3.186 source:map[column:24 line:9791 type:source-location url:https://www.sparkfun.com/static/version1775629953/base/Magento/base/default/jquery.js urlProvider:network]]]

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
Upgrade Your RTK GNSS Board with Tilt Compensation div.sparkfun-blog-item > figure > a > img
cdn.sparkfun.com/c/500-282/assets/home_page_posts/1/6/2/4/5/tilt-comp-line.png149.3 KiB136.0 KiB
Mic Price Check div.sparkfun-blog-item > figure > a > img
cdn.sparkfun.com/c/500-282/assets/home_page_posts/1/6/3/4/4/SoundThumb.png129.5 KiB116.2 KiB
New Product BlueSMiRF v2 - JST A wireless serial bridge made for Bluetooth-enab… div > div.content-col-md-5 > a > div.pagebuilder-slide-wrapper
/media/.renditions/wysiwyg/homepage/FeaturedContent/Secon...141.2 KiB114.4 KiB
A hand interacting with buttons on a breadboard div.pagebuilder-column > figure > a > img.pagebuilder-mobile-only
/media/.renditions/wysiwyg/homepage/categories/kits.jpg?f...118.7 KiB104.5 KiB
New Product Thing Plus - ESP32-C5 The latest ESP32 board for wireless applicati… div > div.content-col-md-5 > a > div.pagebuilder-slide-wrapper
/media/.renditions/wysiwyg/homepage/FeaturedContent/Large...116.4 KiB89.6 KiB
Breadboard Power Supply Kit 5V/3.3V Quickstart Guide li.sparkfun-resources-item > figure > a.light-contrast > img
/c/500-282/assets/learn_tutorials/3/8/3/7/Breadboard_powe...86.5 KiB83.5 KiB
Use Galileo's Free High Accuracy Service With The TX2 div.sparkfun-blog-item > figure > a > img
/c/500-282/assets/home_page_posts/1/6/3/1/2/Galileo-HAS-E...84.9 KiB71.6 KiB
New Product 9DoF IMU Breakout - IM19 A motion tracking breakout that brings tog… div > div.content-col-md-5 > a > div.pagebuilder-slide-wrapper
/media/.renditions/wysiwyg/homepage/FeaturedContent/Secon...90.0 KiB63.1 KiB
Build Your Own High-Concentration CO2 Detector li.sparkfun-resources-item > figure > a.light-contrast > img
cdn.sparkfun.com/c/500-282/assets/learn_tutorials/3/9/6/9/Co2SensingCarThumb.png64.4 KiB61.5 KiB
Qwiic & Easy DIY Ambient Light Indicator li.sparkfun-resources-item > figure > a.light-contrast > img
/c/500-282/assets/learn_tutorials/3/8/7/0/Ambient-Light-S...56.1 KiB53.1 KiB
What's the difference between the ZED-F9P and the ZED-X20P? li.sparkfun-resources-item > figure > a.light-contrast > img
/c/500-282/assets/learn_tutorials/4/0/6/8/zed-x20p-vs-zed...50.3 KiB47.3 KiB
The SparkFun RTK Facet in its black carrying case with accessories on a white b… a > span.product-image-container > span.product-image-wrapper > img.product-image-photo
/media/catalog/product/cache/df4360b598d6f0c75fa659693b37...34.0 KiB29.5 KiB
The SparkFun 9DoF IMU Breakout - IM19 diagonally from the top. a > span.product-image-container > span.product-image-wrapper > img.product-image-photo
/media/catalog/product/cache/df4360b598d6f0c75fa659693b37...33.9 KiB29.5 KiB
The History of BlueSMiRF div.sparkfun-blog-item > figure > a > img
/c/500-282/assets/home_page_posts/1/6/2/7/8/example-mate-...42.0 KiB28.8 KiB
Hello World! displayed on an LCD div.pagebuilder-column > figure > a > img.pagebuilder-mobile-only
/media/.renditions/wysiwyg/homepage/categories/DisplayOLE...36.2 KiB22.1 KiB
A weather meter being hooked up div.pagebuilder-column > figure > a > img.pagebuilder-mobile-only
/media/.renditions/wysiwyg/homepage/categories/Environmen...25.3 KiB11.9 KiB
SparkFun GPS Dead Reckoning Breakout - NEO-M8U (Qwiic) a > span.product-image-container > span.product-image-wrapper > img.product-image-photo
/media/catalog/product/cache/df4360b598d6f0c75fa659693b37...11.2 KiB6.7 KiB
Raspberry Pi 5 - 16GB a > span.product-image-container > span.product-image-wrapper > img.product-image-photo
/media/catalog/product/cache/df4360b598d6f0c75fa659693b37...10.8 KiB6.4 KiB
SparkPNT FPX a > span.product-image-container > span.product-image-wrapper > img.product-image-photo
/media/catalog/product/cache/df4360b598d6f0c75fa659693b37...10.8 KiB6.3 KiB
SparkPNT FPM-T a > span.product-image-container > span.product-image-wrapper > img.product-image-photo
/media/catalog/product/cache/df4360b598d6f0c75fa659693b37...10.6 KiB6.1 KiB
SparkPNT FPM a > span.product-image-container > span.product-image-wrapper > img.product-image-photo
/media/catalog/product/cache/df4360b598d6f0c75fa659693b37...10.2 KiB5.7 KiB
Feature image of the Teensy 4.0 on a white background. a > span.product-image-container > span.product-image-wrapper > img.product-image-photo
/media/catalog/product/cache/df4360b598d6f0c75fa659693b37...10.2 KiB5.7 KiB
A person swiping his RFID card div.pagebuilder-column > figure > a > img.pagebuilder-mobile-only
/media/.renditions/wysiwyg/homepage/categories/rfid-featu...11.0 KiB5.2 KiB
The SparkFun Qwiic Relay - 1x1A DPDT from a top angle. a > span.product-image-container > span.product-image-wrapper > img.product-image-photo
/media/catalog/product/cache/df4360b598d6f0c75fa659693b37...9.1 KiB5.1 KiB
SparkPNT FPL a > span.product-image-container > span.product-image-wrapper > img.product-image-photo
/media/catalog/product/cache/df4360b598d6f0c75fa659693b37...8.7 KiB4.9 KiB
The SparkFun Thing Plus - ESP32-C5 diagonally from the top. a > span.product-image-container > span.product-image-wrapper > img.product-image-photo
/media/catalog/product/cache/df4360b598d6f0c75fa659693b37...8.7 KiB4.9 KiB
A signal illustration symbolizing distance sensing div.row-full-width-inner > figure > a > img.pagebuilder-mobile-only
/media/wysiwyg/homepage/electronic-topics/distance-sensin...8.0 KiB4.5 KiB
Front facing product photo of the NVIDIA Jetson Orin™ Nano Super Developer Kit … a > span.product-image-container > span.product-image-wrapper > img.product-image-photo
/media/catalog/product/cache/df4360b598d6f0c75fa659693b37...8.1 KiB4.5 KiB
NVIDIA Jetson AGX Orin 64GB Developer Kit on a white background. a > span.product-image-container > span.product-image-wrapper > img.product-image-photo
/media/catalog/product/cache/df4360b598d6f0c75fa659693b37...8.0 KiB4.5 KiB
A satellite illustration symbolizing GPS system div.row-full-width-inner > figure > a > img.pagebuilder-mobile-only
/media/wysiwyg/homepage/electronic-topics/gps_gnss.jpg?fo...7.7 KiB4.2 KiB
Featured image of the Teensy 4.1 without Ethernet on a white background. a > span.product-image-container > span.product-image-wrapper > img.product-image-photo
/media/catalog/product/cache/df4360b598d6f0c75fa659693b37...7.5 KiB4.2 KiB
Feature image of the Teensy 4.1 board on a white background. a > span.product-image-container > span.product-image-wrapper > img.product-image-photo
/media/catalog/product/cache/df4360b598d6f0c75fa659693b37...7.4 KiB4.2 KiB
The RockBLOCK 9603N - Iridium SatComm Module next to it's hookup cable. a > span.product-image-container > span.product-image-wrapper > img.product-image-photo
/media/catalog/product/cache/df4360b598d6f0c75fa659693b37...7.3 KiB4.1 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-33-DIV
nodeLabel: BROWSE OUR FULL CATALOG Shop All Categories New Product BlueSMiRF v2 - JST A wi…
path: 1,HTML,1,BODY,23,DIV,2,MAIN,3,DIV,0,DIV,3,DIV
selector: main#maincontent > div.columns > div.column > div.homepage__hero-banner
snippet: <div class="homepage__hero-banner" data-content-type="row" data-appearance="full-width" data-enable-parallax="0" data-parallax-speed="0.5" data-background-images="{}" data-background-type="image" data-video-loop="true" data-video-play-only-visible="true" data-video-lazy-load="true" data-video-fallback-src="" data-element="main" data-pb-style="GM3I434">

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.

URLTransfer SizeDuration
js.hsforms.net/forms/embed/v2.js193.7 KiB1.8 s
/static/version1775629953/frontend/SparkFun/default/en_US...9.0 KiB
/static/version1775629953/frontend/SparkFun/default/en_US...14.3 KiB151 ms
/static/version1775629953/base/Magento/base/default/mage/...1.8 KiB
/static/version1775629953/frontend/SparkFun/default/defau...89.7 KiB452 ms
/static/version1775629953/base/Magento/base/default/mage/...2.3 KiB
/static/version1775629953/base/Magento/base/default/requi...20.0 KiB
/static/version1775629953/frontend/Magento/base/default/A...1.5 KiB
/static/version1775629953/frontend/Magento/base/default/T...603 B
/static/version1775629953/base/Magento/base/default/jquer...433 B151 ms
/static/version1775629953/base/Magento/base/default/mage/...1.3 KiB

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.

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLProtocol
/c/500-282/assets/learn_tutorials/4/0/6/8/zed-x20p-vs-zed...http/1.1
/c/500-282/assets/learn_tutorials/3/8/7/0/Ambient-Light-S...http/1.1
cdn.sparkfun.com/c/500-282/assets/learn_tutorials/3/9/6/9/Co2SensingCarThumb.pnghttp/1.1
/c/500-282/assets/learn_tutorials/3/8/3/7/Breadboard_powe...http/1.1
cdn.sparkfun.com/c/500-282/assets/home_page_posts/1/6/3/4/4/SoundThumb.pnghttp/1.1
/c/500-282/assets/home_page_posts/1/6/3/1/2/Galileo-HAS-E...http/1.1
/c/500-282/assets/home_page_posts/1/6/2/7/8/example-mate-...http/1.1
cdn.sparkfun.com/c/500-282/assets/home_page_posts/1/6/2/4/5/tilt-comp-line.pnghttp/1.1

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

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 753 ms
URLTime Spent
sparkfun.com/753 ms
www.sparkfun.com/0.0 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Diagnostics

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: 1.0 s 225.3 KiB
URLTransfer SizeEst Savings
www.sparkfun.com/static/version1775629953/base/Magento/base/default/jquery.js81.8 KiB53.0 KiB
/static/version1775629953/base/Magento/base/default/knock...68.9 KiB40.0 KiB
/static/version1775629953/base/Magento/base/default/requi...19.7 KiB13.8 KiB
/static/version1775629953/base/Magento/base/default/under...18.6 KiB10.4 KiB
/static/version1775629953/base/Magento/base/default/vimeo...14.7 KiB8.9 KiB
/static/version1775629953/base/Magento/base/default/jquer...17.1 KiB8.5 KiB
/static/version1775629953/base/Magento/base/default/jquer...13.9 KiB7.7 KiB
/static/version1775629953/frontend/SparkFun/default/defau...14.9 KiB6.1 KiB
/static/version1775629953/base/Magento/base/default/mage/...12.7 KiB5.7 KiB
/static/version1775629953/frontend/SparkFun/default/defau...8.1 KiB4.9 KiB
/static/version1775629953/base/Magento/base/default/jquer...9.5 KiB4.8 KiB
/static/version1775629953/base/Magento/base/default/jquer...8.5 KiB4.7 KiB
/static/version1775629953/base/Magento/base/default/jquer...7.2 KiB4.3 KiB
/static/version1775629953/frontend/SparkFun/default/en_US...8.8 KiB3.7 KiB
/static/version1775629953/base/Magento/base/default/jquer...7.5 KiB3.6 KiB
/static/version1775629953/base/Magento/base/default/jquer...6.4 KiB3.4 KiB
/static/version1775629953/frontend/SparkFun/default/defau...6.0 KiB3.2 KiB
/static/version1775629953/base/Magento/base/default/jquer...5.9 KiB3.1 KiB
/static/version1775629953/base/Magento/base/default/Magen...7.3 KiB3.1 KiB
/static/version1775629953/base/Magento/base/default/knock...5.1 KiB3.0 KiB
/static/version1775629953/base/Magento/base/default/jquer...5.3 KiB2.8 KiB
/static/version1775629953/base/Magento/base/default/jquer...4.4 KiB2.5 KiB
/static/version1775629953/base/Magento/base/default/Magen...3.7 KiB2.5 KiB
/static/version1775629953/base/Magento/base/default/js-st...4.4 KiB2.5 KiB
/static/version1775629953/base/Magento/base/default/Magen...4.4 KiB2.4 KiB
/static/version1775629953/base/Magento/base/default/Magen...5.9 KiB2.4 KiB
/static/version1775629953/base/Magento/base/default/Magen...2.9 KiB2.2 KiB
/static/version1775629953/frontend/SparkFun/default/defau...4.0 KiB2.2 KiB
/static/version1775629953/base/Magento/base/default/jquer...5.2 KiB2.1 KiB
/static/version1775629953/base/Magento/base/default/Magen...3.6 KiB2.0 KiB
/static/version1775629953/base/Magento/base/default/jquer...3.8 KiB2.0 KiB
/static/version1775629953/base/Magento/base/default/Magen...2.9 KiB2.0 KiB
/static/version1775629953/base/Magento/base/default/mage/...2.9 KiB2.0 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: 870 ms 105.1 KiB
URLTransfer SizeEst Savings
/static/version1775629953/frontend/SparkFun/default/defau...89.4 KiB79.6 KiB
/static/version1775629953/frontend/SparkFun/default/defau...25.5 KiB25.5 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: 900 ms 331.0 KiB
URLTransfer SizeEst Savings
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js361.8 KiB177.0 KiB
js.hsforms.net/forms/embed/v2.js186.4 KiB74.6 KiB
unpkg.com/@adobe/magento-storefront-event-collector@%5E1/dist/index.js44.9 KiB31.5 KiB
/static/version1775629953/base/Magento/base/default/knock...68.9 KiB24.9 KiB
www.sparkfun.com/static/version1775629953/base/Magento/base/default/jquery.js81.8 KiB23.0 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTotal CPU TimeScript EvaluationScript Parse
www.sparkfun.com/5.6 s3.9 s54 ms
Unattributable2.3 s31 ms0.0 ms
www.sparkfun.com/static/version1775629953/base/Magento/base/default/jquery.js2.0 s886 ms47 ms
/static/version1775629953/base/Magento/base/default/jquer...1.2 s1.1 s7.4 ms
/static/version1775629953/base/Magento/base/default/requi...779 ms526 ms13 ms
/static/version1775629953/base/Magento/base/default/mage/...735 ms610 ms0.7 ms
/static/version1775629953/base/Magento/base/default/Spark...488 ms219 ms0.7 ms
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js429 ms325 ms88 ms
js.hsforms.net/forms/embed/v2.js410 ms319 ms77 ms
js-agent.newrelic.com/nr-spa-1.313.1.min.js363 ms267 ms27 ms
/static/version1775629953/base/Magento/base/default/Magen...257 ms188 ms1.2 ms
/static/version1775629953/frontend/SparkFun/default/defau...247 ms232 ms0.6 ms
/static/version1775629953/base/Magento/base/default/mage/...190 ms64 ms1.9 ms
/static/version1775629953/base/Magento/base/default/Magen...182 ms181 ms1.2 ms
/static/version1775629953/frontend/SparkFun/default/en_US...162 ms140 ms11 ms
/static/version1775629953/frontend/SparkFun/default/defau...107 ms0.0 ms0.0 ms
/static/version1775629953/base/Magento/base/default/mage/...89 ms24 ms1.0 ms
/static/version1775629953/base/Magento/base/default/knock...69 ms1.2 ms67 ms
/static/version1775629953/frontend/Magento/base/default/M...66 ms55 ms0.5 ms
/static/version1775629953/base/Magento/base/default/jquer...53 ms1.1 ms51 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Script Evaluation9.6 s
Other3.8 s
Style & Layout1.9 s
Script Parsing & Compilation875 ms
Parse HTML & CSS569 ms
Rendering222 ms
Garbage Collection166 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 reasonFailure 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

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
/static/version1775629953/frontend/SparkFun/default/defau...1.7 MiB
/static/version1775629953/frontend/SparkFun/default/defau...1.6 MiB
/static/version1775629953/frontend/SparkFun/default/defau...1.6 MiB
/static/version1775629953/frontend/SparkFun/default/defau...490.3 KiB
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362.4 KiB
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js361.9 KiB
www.sparkfun.com/225.8 KiB
js.hsforms.net/forms/embed/v2.js193.7 KiB
cdn.sparkfun.com/c/500-282/assets/home_page_posts/1/6/2/4/5/tilt-comp-line.png150.0 KiB
/media/.renditions/wysiwyg/homepage/FeaturedContent/Secon...141.8 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
A hand interacting with buttons on a breadboard div.pagebuilder-column > figure > a > img.pagebuilder-mobile-only
/media/.renditions/wysiwyg/homepage/categories/kits.jpg?f...
A weather meter being hooked up div.pagebuilder-column > figure > a > img.pagebuilder-mobile-only
/media/.renditions/wysiwyg/homepage/categories/Environmen...
Hello World! displayed on an LCD div.pagebuilder-column > figure > a > img.pagebuilder-mobile-only
/media/.renditions/wysiwyg/homepage/categories/DisplayOLE...
A person swiping his RFID card div.pagebuilder-column > figure > a > img.pagebuilder-mobile-only
/media/.renditions/wysiwyg/homepage/categories/rfid-featu...
Mic Price Check div.sparkfun-blog-item > figure > a > img
cdn.sparkfun.com/c/500-282/assets/home_page_posts/1/6/3/4/4/SoundThumb.png
Use Galileo's Free High Accuracy Service With The TX2 div.sparkfun-blog-item > figure > a > img
/c/500-282/assets/home_page_posts/1/6/3/1/2/Galileo-HAS-E...
The History of BlueSMiRF div.sparkfun-blog-item > figure > a > img
/c/500-282/assets/home_page_posts/1/6/2/7/8/example-mate-...
Upgrade Your RTK GNSS Board with Tilt Compensation div.sparkfun-blog-item > figure > a > img
cdn.sparkfun.com/c/500-282/assets/home_page_posts/1/6/2/4/5/tilt-comp-line.png
What's the difference between the ZED-F9P and the ZED-X20P? li.sparkfun-resources-item > figure > a.light-contrast > img
/c/500-282/assets/learn_tutorials/4/0/6/8/zed-x20p-vs-zed...
Qwiic & Easy DIY Ambient Light Indicator li.sparkfun-resources-item > figure > a.light-contrast > img
/c/500-282/assets/learn_tutorials/3/8/7/0/Ambient-Light-S...
Build Your Own High-Concentration CO2 Detector li.sparkfun-resources-item > figure > a.light-contrast > img
cdn.sparkfun.com/c/500-282/assets/learn_tutorials/3/9/6/9/Co2SensingCarThumb.png
Breadboard Power Supply Kit 5V/3.3V Quickstart Guide li.sparkfun-resources-item > figure > a.light-contrast > img
/c/500-282/assets/learn_tutorials/3/8/3/7/Breadboard_powe...
ublox logo div.pagebuilder-column > figure > a > img.pagebuilder-mobile-only
/media/.renditions/wysiwyg/homepage/brands/400pxubloxlogo...
Sensirion logo div.pagebuilder-column > figure > a > img.pagebuilder-mobile-only
/media/.renditions/wysiwyg/homepage/brands/400pxsensirion...
A wifi symbol illustration div.row-full-width-inner > figure > a > img.pagebuilder-mobile-only
www.sparkfun.com/media/wysiwyg/homepage/electronic-topics/wifi.jpg?format=webply
A signal illustration symbolizing distance sensing div.row-full-width-inner > figure > a > img.pagebuilder-mobile-only
/media/wysiwyg/homepage/electronic-topics/distance-sensin...
A soldering iron symbolizing engineering essentials div.row-full-width-inner > figure > a > img.pagebuilder-mobile-only
/media/wysiwyg/homepage/electronic-topics/engineering-ess...
A satellite illustration symbolizing GPS system div.row-full-width-inner > figure > a > img.pagebuilder-mobile-only
/media/wysiwyg/homepage/electronic-topics/gps_gnss.jpg?fo...

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

●Layout shift culprits
●Optimize DOM size
●Font display
●LCP breakdown
●Optimize viewport for mobile
●Minify CSS
●Avoid long main-thread tasks 20 long tasks found
●Network Requests
●Network Round Trip Times 70 ms
●Server Backend Latencies 250 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 80 ms
○INP breakdown
○User Timing marks and measures
○Avoid non-composited animations
○Avoid large layout shifts
93

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.

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
New Releases div.pagebuilder-column-line > div.pagebuilder-column > div > h5
Best Sellers div.pagebuilder-column-line > div.pagebuilder-column > div > h5

These are opportunities to improve keyboard navigation in your application.

Tables and lists

Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
comparison body#html-body > ul.compare
Featured GPS / GNSS Sensors Development Boards IoT & Wireless Components Kits A… div.section-items > div#store.menu > nav.navigation > ul#ui-id-1
Item div.tabs-content > div#OSKY766 > div > ul#sparkfun-resources-feed-1169589433

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Add to Cart SparkFun 9DoF IMU Breakout - IM19 $199.95 div.slick-track > div#slick-slide10 > div > li.product-item
Add to Cart SEGGER J-Link EDU Mini (with USB-C Cable) $89.95 div.slick-track > div#slick-slide11 > div > li.product-item
Add to Cart LIDAR-Lite v3 $149.99 div.slick-track > div#slick-slide20 > div > li.product-item
Add to Cart Teensy 4.1 $31.50 div.slick-track > div#slick-slide21 > div > li.product-item

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

○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
●Input buttons have discernible text.
●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
●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.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●ARIA IDs are unique
●All heading elements contain content.
●Uses ARIA roles only on compatible elements
●Identical links have the same purpose.
●Elements with visible text labels have matching accessible names.
○`[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
○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
○No form fields have multiple labels
○`<frame>` or `<iframe>` elements have a title
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○`<input type="image">` elements have `[alt]` text
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[lang]` attributes have a valid value
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○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.
92

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.

URLAspect Ratio (Displayed)Aspect Ratio (Actual)
DataLogger IoT div.pagebuilder-collage-content > div > h3 > img#LMF0SQ8
/media/.renditions/wysiwyg/Logos/Ecosystems/datalogger-io...220 x 62 (3.55)330 x 79 (4.18)
Artemis Logo div.pagebuilder-collage-content > div > h3 > img#QUOHQJ8
www.sparkfun.com/media/wysiwyg/homepage/artemis-logo-homepage.png182 x 36 (5.06)165 x 38 (4.34)

General

Issues logged to the `Issues` panel in Chrome Devtools indicate unresolved problems. They can come from network request failures, insufficient security controls, and other browser concerns. Open up the Issues panel in Chrome DevTools for more details on each issue.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Issue type
Content security policy
●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
●Serves images with appropriate resolution
●Page has the HTML doctype
●Properly defines charset
●No browser errors logged to the console
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
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
news.sparkfun.com/16344READ MORE
news.sparkfun.com/16312READ MORE
news.sparkfun.com/16278READ MORE
news.sparkfun.com/16245READ MORE

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

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Document has a meta description
●Page has successful HTTP status code
●Links are crawlable
●robots.txt is valid
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
○Document has a valid `rel=canonical`

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