What makes me skeptical is reading
> I just don’t think we’ve exhausted all the possibilities of making JavaScript tools faster
and then
> Sometimes I look at truly perf-focused JavaScript, such as the recent improvements to the Chromium DevTools using mind-blowing techniques like using Uint8Arrays as bit vectors, and I feel that we’ve barely scratched the surface.
Bit vectors are trivial?
I think the author is too ignorant about those "faster languages". Sure, maybe you can optimize javascript code, but the space of optimizations is only a small subset of what is possible in those other languages (e.g. control over allocations, struct layout, SIMD, ...)
replies(2):