Analyze your JavaScript bundles to find and remove unused code for a faster site.
Review diagnostic information to find possible performance bottlenecks or issues with your website.
Keep the number and size of resources (like images, CSS, JS) small for faster load times.
Use the User Timing API to measure how fast important parts of your site load, so you can optimize them.
Optimize animated content like GIFs or videos so they load quickly and don't use too much data.
Limit the number of third-party scripts and services. Too many can slow down your website.
Use facades for third-party widgets to improve performance by loading them only when needed.
Website performance optimization is the process of making your website faster, more responsive, and more efficient across all devices and connection speeds.
Bootup Time is the time your browser spends starting up scripts and code. Too much code can slow things down. Remove unnecessary scripts for faster bootup.
Critical Request Chains are chains of files that block your page from loading quickly. Reduce dependencies to speed up your site.
Cumulative Layout Shift measures how much content moves around unexpectedly while your site loads. When things jump around, it can be confusing or annoying for users. Keep things steady by setting sizes for images and ads.
A large DOM (lots of HTML elements) can slow down your page, especially on mobile devices. Try to keep your HTML structure as simple as possible.
First Contentful Paint (FCP) measures how quickly something (like text or an image) appears on your website after a user opens it. The faster this happens, the more quickly your visitors feel your site is loading.
Use images that are the right size for each device and layout. Avoid loading huge images on small screens.
Time to Interactive measures how long it takes before your website can fully respond to user clicks and actions. Make sure your site is usable as soon as possible after loading.
Largest Contentful Paint (LCP) tracks when the main, largest element on your page—like a banner or big image—finishes loading. If this is slow, users might think your site is sluggish. Try to make your most important content appear quickly.
Long tasks are pieces of code that block your site from responding quickly to user actions. Break big scripts into smaller pieces to keep your site snappy.
If the main thread is busy for too long, your website will feel slow. Try to reduce the amount of work your JavaScript does while loading.
Using modern image formats like WebP or AVIF can help your images load faster and use less data without losing quality.
Network Round Trip Time measures how long it takes data to travel between your user's device and your server. The shorter the time, the faster your site can start loading.
Network Server Latency is the time the server takes to respond to a request. Lower latency means a quicker loading experience for your visitors.
You can speed up your website by loading images only when they're about to appear on screen (lazy-loading). This saves bandwidth and makes your site feel faster.
Some files, like CSS and JavaScript, can block your page from appearing quickly. Move non-critical files to load later, or load them asynchronously.
Server Response Time is how fast your server sends the first data to the browser. A slow server can delay your entire site, so try to optimize your backend or use faster hosting.
Speed Index measures how quickly your website shows content visually as it loads. A low Speed Index means your page looks ready faster, which keeps visitors engaged.
Total Blocking Time tells you how long your site is unable to respond to user input because the browser is busy. To improve this, reduce the amount of JavaScript running during page load so your site feels fast and responsive.
Large file sizes slow down your website. Reduce the size of images, scripts, and stylesheets to make your site load faster.
Minify your CSS files by removing extra spaces and comments. Smaller CSS loads faster and helps your page appear quicker.
Minify your JavaScript files by removing spaces, comments, and unused code. This speeds up the loading of your site.
Always set width and height for your images in the HTML. This helps the browser reserve space and prevent layout shifts while your site loads.
Remove CSS rules that are not being used by your website. Less CSS means faster loading times.
Remove JavaScript that isn't needed for your page. Less JavaScript helps your site load faster and perform better.
Set longer cache times for static files (like images and scripts) so repeat visitors don't have to download them again. This makes your site feel much faster.
Preconnect lets the browser set up early connections to important third-party services, making your site start loading faster.
Serve images that are sized correctly for each device (like smaller images for mobile) so your site loads faster for everyone.
Compress your text files (such as HTML, CSS, and JavaScript) before sending them to users. This makes your website load faster, especially on slow connections.
Input fields should have clear and unique names to help users understand what to enter.
Make sure ARIA attributes are used correctly. Invalid attributes can confuse assistive technologies.
Only use valid values for ARIA attributes. Invalid values may break accessibility.
Don't hide the entire page with ARIA attributes unless you have a good reason—users won't be able to access your content.
Avoid hiding elements that are focused. Users may get lost if focus moves to a hidden element.
Add captions to your videos so users who are deaf or hard of hearing can understand the content.
Include skip links so users can jump past repeated content, like menus, to the main part of the page.
Format lists using proper <ul> or <ol> tags so screen readers can read them correctly.
Every button should have a clear, visible label that tells users exactly what it does — like 'Submit, ' 'Add to cart, ' or 'Book now.' Avoid vague labels like 'Click' or buttons that only show an icon with no text.
Select dropdowns should have visible labels so users know what they're choosing.
Keep your headings in a logical order (like h1, h2, h3) so users can easily understand the structure of your content.
If you use keyboard shortcuts (accesskeys), make sure they don't conflict with browser or screen reader shortcuts.
Mark required fields clearly so all users know they have to fill them in.
Use ARIA roles and attributes correctly to help screen readers and assistive technology understand your site.
Make sure definition lists (<dl>) have properly paired terms and descriptions.
Ensure that all form elements have clear labels. Labels help users know what to enter and make forms accessible for everyone.
Set a viewport so your website displays well on mobile devices, allowing for proper scaling and responsiveness.
Use tabindex wisely to control keyboard navigation on your site, making it easier for users who don't use a mouse.
Use clear, descriptive link text so users know what to expect. Avoid vague terms like 'click here.' Instead, use short and meaningful phrases like 'See pricing', 'Book a tour', or 'Shop new arrivals.'
Make sure buttons and links are large enough to tap easily, especially on mobile devices.
Interactive fields (like toggles) should have names that clearly describe their purpose.
Include one main landmark (like <main>) to help users quickly find your main content.
Ensure your text has enough contrast with the background color. Good contrast makes your site readable for everyone, including people with visual impairments.
Every iframe must have a descriptive title, so screen readers can explain what it is.
Always set the language of your page in the HTML tag (like <html lang='en'>) so browsers and assistive technologies know how to read your site.
Add descriptive alternative text (alt text) to your images so users with screen readers or slow connections can understand your content.
Don't prevent users from pasting into input fields. It can be frustrating, especially for passwords.
Avoid using meta refresh tags. They can be confusing and disruptive for users relying on assistive technologies.
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Use large enough font sizes so your content is easy to read, especially on small screens.
Fix broken links on your site. Broken links can hurt your SEO and create a bad experience for users.
Use structured data (like Schema.org) to help search engines better understand your content and improve your appearance in search results.
Ensure your site isn't blocking important pages from search engines. Let search bots access your content so it appears in search results.
Set up a robots.txt file to guide search engines on what pages to crawl or ignore. Don't accidentally block important pages.
Add a canonical tag to indicate the preferred version of a page. This helps prevent duplicate content in search results.
Use hreflang tags if your site is available in multiple languages, so search engines show the right version to each user.
Use descriptive text for your links so users and search engines know what to expect when clicking.
Add a clear and concise meta description tag to each page. This helps search engines understand your content and can increase your click-through rate in search results.
Make sure links use valid URLs and can be followed by search engines for better site indexing.
Meta tags are the hidden code that makes or breaks your website's first impression in search results and social media. Without proper meta tags, search engines and social platforms can't understand or properly display your content, leading to poor visibility and lost traffic.
If your site shows most of its content only after JavaScript loads, search engines may have trouble indexing it. Include important content in your initial HTML for better SEO.
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Make sure each page returns the correct HTTP status code, such as 200 for success or 404 for not found. Incorrect codes can confuse search engines and users.
Only use valid ARIA attributes to ensure compatibility with screen readers.
Every HTML element must have a unique id. Duplicate ids can cause issues with scripts and accessibility tools.
Limit or avoid using third-party cookies to help protect your users' privacy and comply with privacy regulations.
Fix issues flagged by browser inspectors to improve your site's reliability.
Fix all JavaScript errors shown in the browser console. These errors can break features, hurt performance, and make your site feel unreliable.
Avoid asking for geolocation permissions as soon as the site loads. Let users interact with your site first.
Redirect all HTTP traffic to HTTPS for better security.
Set the viewport meta tag for proper scaling on different devices. This helps your site look good on all screen sizes.
Add landmarks (like <nav>, <main>, <footer>) so users can easily navigate your site using assistive technology.
Use passive event listeners to make scrolling smoother — especially on phones and tablets. Passive listeners tell the browser that the scroll won't be blocked, so it can scroll right away without waiting.
Use the 'font-display' property in your CSS to make sure text is visible quickly while custom fonts load.
Reduce the amount of work done on the browser's main thread (this is what handles everything the user sees and interacts with — like clicking, scrolling, and typing). If it gets too busy, your site may feel slow or unresponsive.
Update your site to stop using deprecated web features, which might stop working in future browsers.
Remove unused JavaScript libraries to keep your website fast and reduce security risks.
Prevent unexpected layout shifts by reserving space for images, ads, and embeds.
Make sure the language code in your HTML is valid (like 'en' for English). This helps screen readers and translation tools.
Don't use redundant words like 'image' or 'photo' in your alt text. Be concise and clear about what the image shows.
The Largest Contentful Paint element is the biggest thing that loads on your page, like a large image or video. Make sure this element loads quickly to improve user experience.
Compress your images to reduce their file size. Smaller images load faster and improve your site's overall performance.
Reduce the number and size of network requests (like scripts and images) to improve page speed.
Don't prompt users for notifications right away. Wait until they've interacted with your site.
Make sure the order of elements in your HTML matches the order they appear visually, for consistency and accessibility.
Always include a valid doctype at the top of your HTML file to ensure browsers render your site correctly.
Avoid using document.write in your JavaScript. It's outdated, can make your site slower, break the page, and open the door to security risks. Use safer methods like DOM manipulation instead.
Upgrade your site to HTTP/2 to take advantage of faster and more efficient connections between the server and users.
Specify the correct character encoding (like UTF-8) to make sure your text displays properly for all users.
Always use HTTPS to encrypt data between your site and visitors. This protects user privacy and is required by most browsers.