Actionable Tips to Improve Audit Scores

Improving Performance

Optimize Images: Compress images using tools like TinyPNG or Squoosh. Use modern formats like WebP or AVIF. Ensure images are correctly sized for their containers (responsive images). Learn more about image optimization (Google)
Reduce Server Response Time (TTFB): Optimize your server, upgrade your hosting plan, or use a Content Delivery Network (CDN).
Eliminate Render-Blocking Resources: Defer loading of non-critical JavaScript and CSS. Inline critical CSS needed for above-the-fold content.
Minify CSS and JavaScript: Remove unnecessary characters (whitespace, comments) from code files to reduce their size. Tools are often built into frameworks or bundlers.
Leverage Browser Caching: Set appropriate cache headers for static assets so browsers don't have to re-download them on subsequent visits.
Reduce Third-Party Code Impact: Audit the performance impact of analytics scripts, ad trackers, and embeds. Load them asynchronously or defer them if possible.
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Ensure Sufficient Color Contrast: Use tools to check that text and background colors have enough contrast, especially for users with visual impairments. WCAG 2.1 Contrast Guidelines
Add Alt Text to Images: Provide descriptive alternative text for all meaningful images so screen readers can convey their content.
Use Semantic HTML: Employ HTML5 elements like <nav>, <main>, <article>, <aside> correctly to define page structure.
Enable Keyboard Navigation: Ensure all interactive elements (links, buttons, form fields) are focusable and usable with only a keyboard.
Use ARIA Attributes Appropriately: Add ARIA (Accessible Rich Internet Applications) roles and properties where necessary to enhance screen reader understanding, but avoid overuse.
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Use HTTPS: Secure your site by serving it over HTTPS. Obtain an SSL certificate (many hosts offer free ones). MDN Web Security Guide
Avoid Browser Errors: Check the browser's developer console for errors (JavaScript issues, failed network requests) and fix them.
Declare Correct Doctype: Start your HTML with <!DOCTYPE html>.
Avoid Deprecated APIs: Update your code to use modern browser features and avoid APIs that are being phased out.
Ensure Proper Image Aspect Ratios: Specify width and height attributes on images to prevent layout shifts as they load.
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Include <title> and Meta Description: Write unique, descriptive titles and meta descriptions for each page. Google Search Essentials
Ensure Content is Crawlable: Check that robots.txt isn't blocking important content and that links use proper <a href="..."> tags.
Use Descriptive Link Text: Avoid generic text like "click here." Use text that clearly indicates the link's destination (e.g., "Learn more about our SEO services").
Add alt Attributes to Images: This helps search engines understand image content (and also benefits accessibility).
Ensure Mobile-Friendliness: Use responsive design so your site adapts well to different screen sizes.
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Focus on the specific recommendations provided in your audit report, as they will pinpoint the exact issues affecting your scores.