While I'd usually prefer to be nice in the mornings ... starting off with those benchmarks got my goat. So. This sort of thing is a beautiful demonstration of marketing, big promises, and bombastic rhetoric in open source. But one of the best things about open source is that you don't have to take such claims at face value. If you actually look at the source, you'll find: https://github.com/moot/riotjs/blob/29ae687ca…
Actually I think it is a joke. Kind of. It's an elaborate argument for a philosophy (basically: eschew frameworks, use jQuery for DOM and events, manage your own MVP structure).
They go on to say "You don't need a framework" (repeatedly), and "Riot is a manifesto for vanilla JavaScript and jQuery".
I see it as a functioning demo to present an opinion about how apps should be written. Viewed like this, the whole "world's fastest framework" thing seems tongue-in-cheek. Their use of the familiar "Unveiling a new framework" device is a conceit to push a philosophy. It's allegorical.
I admit that starting off with silly benchmarks undermines the point a lot :)