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When JavaScript takes a long time to execute it can slow down website performance.

Duplicate JavaScript modules can slow down a website by requiring unnecessary downloads.

Inefficient animated content formats such as animated GIFs should be replaced by video.

This measures how long it takes a browser to render the first piece of content when someone visits a website.

This measures how long it takes a page to become fully interactive.

This approximates when the main content of the page is visible to users.

Lazily loading above the fold images can negatively affect performance.

When the main thread is busy the website may not respond quickly to user interactions.

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External scripts dynamically injected via document.write() can delay page load by tens of seconds.

Lazy-loading offscreen and hidden images after all critical resources have finished loading can significantly increase website performance.

The image used by the largest contentful paint element should be preloaded to maximize performance.

Avoid multiple page redirects as they introduce additional delays before the page can be loaded.

Excessively large page sizes can lead to long load times for visitors.

Minifying CSS files can reduce payload sizes.

Add preconnect resource hints to establish early connections to important third-party origins.

Responsive images that are appropriately-sized save network resources and improve load time.

Text-based resources can be served with compression (gzip, deflate or brotli) to minimize network load.

Incorrect character encoding can result in garbled text and is properly declared in the charset attribute or the Content-Type HTTP response header.

Specifying a doctype prevents the browser from switching to quirks mode, which can cause a website to render in unexpected ways.

Users are mistrustful or confused by websites that request their location without context.

Images displayed with an incorrect aspect ratio look distorted.

Images should be responsive and proportional to the display size and the pixel ratio to maximize image clarity.

Unload event listeners do not fire reliably and listening for them can intefere with website functionality and browser optimizations.

Users are mistrustful of or confused by sites that request to send notifications without context.

Touch and wheel event listeners should be marked as passive to improve scroll performance.

Correctly setting the viewport optimizes websites for mobile screen sizes and also prevents delays to user input.

Inspector issues indicate unresolved problems which can include security issues.

All websites should be protected with HTTPS including ones that don't handle sensitive data.

Preventing password fields from being pasted into undermines good security policy.

The value of an ARIA ID must be unique to prevent other instances from being overlooked by assistive technologies.

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.

If the website doesn't specify a language correctly screen readers might not be able to read the text correctly.

Specifying a valid land attribute helps screen readers announce text correctly.

Lists must only contain list elements so that screen readers can correctly announce lists.

List items must be contained within a parent list for screen readers to properly announce lists.

A tabindex value greater than 0 implies an explicit navigation ordering which often creates frustrating experiences for users who rely on assistive technologies.

Valid canonical links tell search engines which version of a page to crawl and display to users in search results.

Search engine users rely on the document title to determine if a page is relevant to their search.

Many sites provide different versions of a page based on a user's language or region and hreflang links tell search engines the URLs for all the versions of a page so that they can display the correct version.

Pages with unsuccessful HTTP status codes may not be indexed by search engines properly.

Meta descriptions may be included in search results to help convey website content.

Search engines can't index plugin content and many devices restrict plugins or don't support them.

A valid robots.txt is required for search engines to understand how to crawl or index a website.