Table of content

DJIA Cache – Performance Tab

Browser Cache Headers

Send Cache-Control headers for cacheable pages

When enabled, DJIA Cache sends Cache-Control and ETag headers for cached pages.

These headers allow browsers to store cached responses and reuse them without requesting the full page again.

Benefits:

  • faster repeat visits
  • reduced server load
  • improved page load performance

HTML cache TTL (seconds)

Defines how long HTML pages should remain cached in the visitor’s browser.

Example:

3600

This means the browser will keep the cached HTML page for 3600 seconds (1 hour) before requesting a new version.

Asset cache TTL (seconds)

Defines how long static assets should be cached in the browser.

Assets include:

  • CSS files
  • JavaScript files
  • images
  • fonts

Example:

31536000

This equals 1 year of browser caching.

Using longer TTL values for static assets improves performance because browsers do not need to download the same files repeatedly.

Core Web Vitals Optimization

These settings help improve Google Core Web Vitals metrics, including LCP, CLS, and overall page rendering performance.

Boost LCP (preload & prioritize featured image)

Preloads and prioritizes the featured image on posts and pages.

This helps the browser load the most important visible image earlier, improving Largest Contentful Paint (LCP).

Benefits:

  • faster above-the-fold rendering
  • improved PageSpeed Insights scores
  • better user experience

Enable native lazy-loading for images

Adds the following attribute to images where safe:

loading="lazy"

This defers loading of offscreen images until they are about to enter the viewport.

Benefits:

  • faster initial page load
  • reduced bandwidth usage
  • improved performance on mobile devices

Enable native lazy-loading for iframes

Adds the following attribute to iframe elements where safe:

loading="lazy"

This delays loading of embedded content such as:

  • YouTube videos
  • Google Maps
  • third-party widgets

until they become visible.

Add decoding=”async” to images

Adds the following attribute to images:

decoding="async"

This allows browsers to decode images asynchronously, reducing rendering delays and improving page responsiveness.

WordPress Feature Optimization

These options disable unnecessary WordPress features that often load additional scripts or styles.

Removing them helps reduce page size and improve performance.

Disable emoji scripts and styles

Removes WordPress emoji scripts and styles from the front-end.

This eliminates unnecessary JavaScript and CSS that are rarely needed.

Benefits:

  • fewer HTTP requests
  • smaller page size
  • faster page loading

Disable WordPress embeds

Disables WordPress oEmbed functionality and related scripts.

This prevents WordPress from automatically embedding external content such as tweets or videos.

Benefits:

  • fewer scripts loaded
  • reduced front-end overhead

Disable Dashicons for guests

Removes Dashicons CSS for visitors who are not logged in.

Dashicons are primarily used in the WordPress admin interface and are usually not required on the front-end.

Benefits:

  • reduces CSS size
  • improves loading speed for visitors

⚠ Warning

Disabling embeds or Dashicons may affect themes or plugins that rely on them.

Always test your website after enabling these options.

DNS Optimization

DNS prefetch URLs

Allows you to define external domains for DNS prefetching.

DNS prefetch helps browsers resolve domain names earlier so that external resources load faster.

Example:

 //fonts.googleapis.com
 //fonts.gstatic.com
 //cdn.jsdelivr.net

Each hostname should be placed on a new line.

This is especially useful for:

  • font providers
  • CDNs
  • analytics scripts
  • external APIs