For the last 10 years progressive JPEG has been the fastest growing image format in the internet. Today, about 20-25 % of JPEGs in the internet are progressive.

For the last 10 years progressive JPEG has been the fastest growing image format in the internet. Today, about 20-25 % of JPEGs in the internet are progressive. Mozjpeg outputs progressive JPEGs by default. JPEG decoding times are usually in the ballpark of 10 milliseconds, often considered an insignificant performance factor in the system analysis.