After the opening keynote, this is a breath of fresh air. Kind of odd (but nice/well deserved!) to see him riff on DHH's keynote.
As a consequence, they have made lots of contributions and improvements to Ruby infrastructure. That includes two JIT compilers (YJIT and ZJIT) and a new parser.
FWIW, he even riffs on his own boss when referencing the "slop grenades".