Colin's done a lot of work in improving boot time on EC2 and in general, so I'm a little surprised he didn't actually mention the boot time in this article. In 2022Q1 he had boot time down to 8s (in EC2, IIRC); based on how cut down the FIRECRACKER config he added is and that there's no loader involvement, I don't think it'd be too surprising if he hits ~5-6s or less.