So Kitten’s build process (i.e., the time it takes to build Kitten itself) takes ~0.7 seconds on my ~1 year old desktop (Ryzen 7 5700G 3.8Ghz) vs ~1.4 seconds on my ~three-year-old Starlabs LabTop (renamed to the Starbook thanks to a suggestion by yours truly but sadly, not quickly enough).
So, in summary, it’s bloody fast for something that results in a ~9MB bundle.
(And that’s all thanks to esbuild.)