Note that hackernews is notoriously anti “marketing speech”. I don’t think there’s anything bad with elaborating but lightweight/snappy/slim is pretty much what’s important, given that there’s so much slow bloatware out there. Not all users are technical, and eg throwing out benchmarks on the front page would be complete mumbo jumbo to many users.

That said, I also think the best way to communicate the intended vibe is also through screenshots (which you already have) and design. Looks awesome.