The SVGO-GUI has not been updated since 2015. I added out-of-the-box SVG optimization to my Optimage [1]. Fun fact: Node.js binary can be just 3MB compressed. ImageOptim [2] handles SVGs as well if Node.js is installed.
The transparent JPEG-in-SVG files can also be made with nothing but ImageMagick and Bash [3].
The transparent JPEG-in-SVG files can also be made with nothing but ImageMagick and Bash [3].
[1] http://getoptimage.com
[2] https://imageoptim.com/mac
[3] https://github.com/vmdanilov/svgize