In order to improve page load performance, I propose that the default image compression setting be changed from 90 to 82 in WordPress. Let’s get into why. Background The default quality setting for resized images in WordPress has been 90 since the image_resize() function was shipped in version 2.5. This setting creates images with much larger file sizes than recommended by modern web best practices. Over the past several years, the importance of performance has been highlighted as users access the web globally on slower connections, and performance has even started being used by search engines to influence search results. Tools like Google PageSpeed Insights and WebPagetest will warn site owners if images aren’t sufficiently compressed. For example, the glossary at the bottom of the WebPagetest performance optimization page states: Within 10% of a photoshop quality 50 will pass, up to 50% larger will warn and anything larger than that will fail. The overall score is the percentage of image bytes that can be saved by re-compressing the images. Research With this in mind, web developer and performance advocate Dave Newton published recommendations for ImageMagick compression settings
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