notice the "3x3" goal is on a specific benchmark (optcarrot), not on all workloads.
There's no such thing as a performance measurement "on all workloads".
A lot of focus has been on this benchmark https://github.com/mame/optcarrot/
It has seen huge performance improvements thanks to the mjit but not quite 3x yet.
Performance is more of an implementation level change rather than a language change unless they are restricting the language to facilitate new optimisations.