Author here. I released the tool a few weeks back and since downsized the EC2 instance. So this post pretty much killed the box. I've just up-sized it again but it's still running fairly slowly due to high load. It typically finds around 5 secrets/a second. Corresponding blog post here: https://darkport.co.uk/blog/ahh-shhgit!/ and you can run your own instance here: https://github.com/eth0izzle/shhgit