Not that I'm a fan of Context (or even React); but without publishing the benchmark code or specific technical arguments, it's hard to support a claim about slowness or of speed.
It's never my intention for this library to try and be the "best" out there. I simply want to create what I sought for, which is the closest to the simplest approach I can think of. And to share it to the public, in case someone out there is looking for the same thing I am, and maybe it could help that someone. That's what open source is for, after all.