According to https://github.com/google/guetzli:

Introduction

Guetzli is a JPEG encoder that aims for excellent compression density at
high visual quality. Guetzli-generated images are typically 20-30% smaller
than images of equivalent quality generated by libjpeg. Guetzli generates
only sequential (nonprogressive) JPEGs due to faster decompression speeds
they offer.

Note: Guetzli uses a large amount of memory. You should provide 300MB of
memory per 1MPix of the input image.


So if you have a 24Mpix camera this will be 7.2 GB of RAM for exporting a
jpeg.

That does not mean I am against adding it as an option.

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