Serving modern, high-efficiency image formats is one of the most effective ways to reduce website file sizes and improve Core Web Vitals. Yet, converting images manually before uploading them remains a time-consuming step for content teams. When evaluating the media handling capabilities of WordPress 6.9 against the technical features of WordPress 7.0, we witness a major upgrade in media optimization.
WordPress 6.9 offered basic WebP support, allowing users to upload pre-converted WebP files directly to the Media Library. However, if a user uploaded a standard, heavy JPEG or PNG image, the system would process and store it in that legacy format, generating multiple resized versions in the same uncompressed structure. This filled server storage with heavy files, slowing page loads for mobile users.
WordPress 7.0 solves these performance bottlenecks by implementing automated WebP and AVIF conversion pipelines directly inside the core media engine. When a content creator uploads any standard image file, WordPress 7.0 instantly compresses and converts it into high-efficiency WebP and AVIF formats natively on the server, serving the optimal format to supported browsers.
Additionally, this pipeline automatically generates clean, modern responsive image source sets (srcset), ensuring that mobile viewports only download highly compressed, correctly sized AVIF assets. This reduces server bandwidth consumption by up to 50% compared to legacy setups. By upgrading these media handling mechanics, WordPress 7.0 delivers a high-speed editing environment that maintains top-tier performance on both mobile and desktop viewports.