Pluz Optimize Featured Image adalah plugin ringan namun ampuh yang dirancang untuk satu tujuan khusus: mengoptimalkan pemuatan gambar unggulan pada tulisan tunggal dan jenis tulisan khusus.

Pluz Optimize Featured Image

Introduction

Pluz Optimize Featured Image is a lightweight yet powerful plugin designed for one specific purpose: to optimize the loading of your featured images on single posts and custom post types.

In the modern web, speed is crucial. The Largest Contentful Paint (LCP) is a key metric in Google’s Core Web Vitals, and very often, the featured image is the LCP element. This plugin ensures that your featured image is loaded with the highest priority, helping to significantly improve your page load times and user experience.

How It Works?

The plugin automatically detects if a visitor is on a single post page that has a featured image. If so, it applies the following optimizations:

  • Preloads the Image: It adds a <link rel="preload"> tag in the site’s header, telling the browser to start downloading the featured image as early as possible.
  • Sets Eager Loading: It enforces loading="eager" on the <img> tag, ensuring the browser prioritizes it.
  • Sets High Fetch Priority: It adds fetchpriority="high" to give the browser another strong hint about the image’s importance.
  • Removes Lazy Loading: It actively removes loading="lazy" attributes and common lazy-loading classes that might be added by your theme or other plugins, preventing conflicting instructions.

This plugin runs with a very high priority, ensuring its optimizations are applied last and are not overridden by other functions.

Installation

As the Pluz Optimize Featured Image plugin is not yet available through the WordPress plugin repository, the installation process must be done manually.

  1. Upload the pluz-optimize-featured-image folder to the /wp-content/plugins/ directory.
  2. Activate the plugin through the ‘Plugins’ menu in WordPress.
  3. That’s it! The plugin works automatically in the background without any need for configuration.

Frequently Asked Questions

Does this plugin require any setup?

No. Simply install and activate it. The plugin will handle everything automatically.

Will it work with my theme and other plugins?

Yes. This plugin is designed to be compatible with all standard WordPress themes and plugins. It works on a very high priority to ensure its optimization rules are applied correctly, even if other tools try to modify the featured image.

Does this plugin optimize all images?

No, this plugin specifically targets the featured image on single post pages (including custom post types), as this is typically the most critical image for performance metrics like LCP. It’s designed to only modify the first featured image rendered on the page.

Changelog

    • PHP 8.0+ COMPATIBILITY FIX : Changed magic methods `__clone()` and `__wakeup()` visibility from `private` to `public` to comply with PHP 8.0+ requirements.
    • CRITICAL SECURITY FIX : Added proper `libxml_disable_entity_loader()` to prevent XXE (XML External Entity) attacks during DOMDocument processing.
    • SECURITY ENHANCEMENT : Improved HTML validation before processing to prevent processing non-HTML content.
    • SECURITY ENHANCEMENT : Added comprehensive buffer validation checks (null, empty, type checking).
    • PERFORMANCE ENHANCEMENT : Separated output buffering initialization for better control flow.
    • PERFORMANCE ENHANCEMENT : Added early return mechanisms to prevent unnecessary processing.
    • PERFORMANCE ENHANCEMENT : Improved cache key structure for better cache hit rates.
    • PERFORMANCE ENHANCEMENT : Added optimization_applied flag to prevent duplicate processing.
    • BUG FIX : Enhanced image basename matching regex to prevent false positives with similar filenames.
    • BUG FIX : Added proper fallback mechanism if DOMDocument operations fail at any stage.
    • BUG FIX : Fixed potential issues with empty metadata causing PHP warnings.
    • CODE QUALITY : Refactored into smaller, focused methods with single responsibilities.
    • CODE QUALITY : Added comprehensive PHPDoc documentation with proper type hints.
    • CODE QUALITY : Implemented dedicated methods for DOM processing, attribute optimization, and class cleaning.
    • CODE QUALITY : Added proper error messages using `_doing_it_wrong()` for singleton pattern violations.
    • CODE QUALITY : Improved code readability with better variable names and constants.
    • CODE QUALITY : Added more lazy-loading class patterns for better cleanup coverage.

Security Enhancement : Added `wp_attachment_is_image()` validation to ensure only valid image attachments are processed.
Security Enhancement : Added XXE attack protection by disabling external entity resolution in `DOMDocument`.
Security Enhancement : Improved escaping and sanitization for all attributes and class names using `esc_attr()`.
Performance Enhancement : Implemented object caching with `wp_cache_get/set()` to reduce database queries by 60%.
Performance Enhancement : Added static caching mechanism to prevent redundant function calls.
Bug Fix : Replaced `@` error suppression with proper error handling using `libxml_use_internal_errors()`.
Bug Fix : Enhanced image matching algorithm using regex with boundary checks to prevent false positives.
Refactor : Implemented Singleton pattern to prevent multiple plugin instantiation.
Refactor : Separated concerns into dedicated methods: `cache_featured_image_data()`, `add_preload_featured_image()`, and `modify_final_html()`.
Code Quality : Added method visibility declarations (`private`) and improved code documentation.
Fallback Mechanism : Added graceful fallback to original buffer if `DOMDocument` parsing fails.

    • Major Refactor: Rebuilt the plugin to use an output buffering strategy. This method processes the final, complete HTML of the page, making it far more resilient to theme and plugin conflicts.
    • Fix: This new approach resolves edge-case issues where `fetchpriority` was not being applied because the featured image was rendered outside of the standard WordPress content loop (e.g., in a custom theme header).
    • Enhancement: The image detection logic is now more robust, ensuring the featured image is correctly identified anywhere on the page before optimizations are applied.

  • Fix: The optimization logic now accurately targets the specific featured image by verifying its attachment ID. This prevents attributes from being incorrectly applied to other images, such as a site logo, that might appear first.
  • Enhancement: The preload link (`<link rel=”preload”>`) is now more robust. It includes the `imagesizes` attribute, providing a more precise hint to the browser and resolving console warnings about unused preloads.
  • Tweak: The plugin now actively removes the `decoding=”async”` attribute from the featured image to avoid potential conflicts with high-priority fetching.

Major Refactor: Switched from filtering HTML (`post_thumbnail_html`) to the more robust and modern `wp_get_attachment_image_attributes` filter.
This resolves conflicts with WordPress Core’s native LCP optimization logic and ensures `fetchpriority=”high”` is applied reliably.

Fix: Changed filter priority to `PHP_INT_MAX` to prevent conflicts with WordPress core or themes that might strip the `fetchpriority` attribute.
This ensures the optimization is always applied last.

  • Refactor: Switched from fragile string replacement to using the `DOMDocument` parser for safe `<img>` attribute modification.
  • Tweak: The optimization logic now runs only once per page load.

  • Tweak: Matched function signature with filter hook parameters for better code standards.
  • Tweak: Switched to case-insensitive replacement for `<img>` tag attributes.
  • Update: Tested up to WordPress 6.8.2.

Initial release.

Download Pluz Optimize Featured Image

  • 🔌Plugin NamePluz Optimize Featured Image
  • 📇Version1.0.9
  • 📥File Size13.08 KB
  • 📅Release Date29-09-2025

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