As I write this update I see that I failed to upload v1.4.0 for Ubuntu.

Hopefully update v1.4.1 will make up for the mistake as it brings an (approximate) 3x speedboost.

On a 2080s I am able to generate images at 512x512 20 steps on eular_a in 2 seconds (previously 6~).

Additionally Ubuntu users will now see the updates mentioned in my previous post.