It's not that it's too slow for me, it's that it isn't my place to do it, despite being a FOSS enthusiast. I don't use the project, have never tried it, and am currently heavily entrenched in Godot and Unreal. Looks very interesting, but switching mid-development won't happen. Furthermore, if it is apparently "dying", it's a self-fulfilling prophecy, sadly.
Rather than encourage me to change it, why don't you? You seem to know a lot more about it than I do for starters. In the time you engaged with me, you could have submitted the PR yourself and thanked me for the feedback. Herein lies why the project likely hasn't caught on—not enough focus on contributing.