Hi there!
I like your ultra-fast requirement. That's where I'm strong at.
And WebGL.
And math.
Contact me via chat (even if u don't intend to hire me).
My 1st question is: u want to mimic some of PixiJS, ok. But what features are really a must have to u (except of a folder structure)? PixiJS is quite big project, u know.
Here's 20 years of experiences in the field (I even programmed in prehistoric 90ies JavaSscipt, Java and 1st version of CSS as a student :) )
good luck with the project.