Overview

By reserving space for ads and intelligently controlling how they load, CLS Ad Slot ensures your pages remain visually stable while still delivering fully optimized ad placements.

Built as a child project to JCH Optimize, it tackles one of the most common performance issues that traditional optimization tools alone cannot fully solve: unstable ad rendering.

Key Benefits

• Eliminate Layout Shift (CLS) Keep your pages stable and compliant with Core Web Vitals
• Improve User Experience No more jumping content or unexpected page movement
• Protect Ad Revenue Maintain visibility while optimizing placement and behaviour
• Ad Blocker Aware Gracefully handle blocked ads with fallback options
• Performance Friendly Lazy loading ensures ads load only when needed

Core Features

• ** CLS-Safe Ad Rendering** Predefined slot dimensions prevent layout movement
• Smart Lazy Loading Loads ads only when they enter the viewport
• Advanced State Handling Detects and responds to:
  • Filled ads
  • Unfilled Inventory
  • Blocked requests
• Optional Slot Collapse Automatically removes unused ad space
• Fallback Content Support Display alternative content when ads are blocked
• Multiple Ad Formats
  • Display Ads
  • In-Article Ads
  • In-Feed Ads
  • Multiplex Ads
• Flexible Placement
  • Module-based positioning
  • Automatic insertion within content and feeds

Who is it for?

• Publishers monetizing with Google AdSense
• Site owners focused on Core Web Vitals
• Anyone frustrated with layout shift caused by ads.
• Joomla users who want full control over ad placement

Why CLS Ad Slot?

Most ad integrations rely on scripts that dynamically inject ads, often causing layout shifts and a poor user experience.

CLS Ad Slot takes a different approach:
> Control the space, Control the load. Control the outcome.

Get Started

Set up your ad units, place your slots, and let CLS Ad Slot handle the rest-delivering stable, high-performance ad experiences across our site.

Requirements

• Joomla 5+
• PHP 8.2+