I've found the Xenforo core files to specify jpeg compression ratio, but I'd also like GD to: Output only interlaced/progressive JPEG'S (so they don't cause content re-flow as sets of large images load in to a thread. This is a serious usability issue for photo-heavy posts/threads.) Strip all EXIF data (not sure if this is already being done). Strip any color profiles and remaining metadata. Perform any JPEG optimizations that are available to achieve the smallest file sizes at any cost. Has anyone attempted this or know how/where to implement the above? I'm more familiar with ImageMagick than GD. I assume they're capable of similar functions. Thanks in advance.