While I totally agree with you, I'm looking for a counter example. The only one which comes to my mind, is non trivial and quite fast for js/ts is this : https://github.com/tsoding/raycasting An implementation of raycast in a 2D canvas The dev tried to implement hot reloading, and you can see all the process there https://www.youtube.com/playlist?list=PLpM-Dvs8t0VZ08cYW6yqN...

Even though I didn't measured the loading time, an effort has been made to accelerate everything that could be accelerated.