The quality-to-size ratio refers to the balance between an image's visual quality and its file size. Achieving an optimal ratio is crucial for web performance, as high-quality images with large file sizes can slow down page load times, while overly compressed images may degrade visual appeal.

Techniques such as selecting appropriate formats (e.g., WebP), applying efficient compression, and utilizing responsive images help maintain this balance, ensuring fast loading times without compromising image quality.

Learn more about quality-to-size ratio in regards of images.