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Emphatically agreed. I've wanted to hear about this for years.

I am interested in this too, however the team seems very secretive about this aspect of the project.

I've never experienced a non-performant cross-platform UI.

Well, to be honest I've heard of folks complaining about Electron apps, but are easy enough to avoid. Oh yeah and Swing was a bit sluggish… in the 90s.

What am I missing?

Still no answers but a lot of malicious downvotes.

Allow me to somewhat quippishly rephrase your original post: "I've never heard of badly performing cross-platform apps, except for the ones written in what's currently the most popular cross-platform toolkit and the ones written in one of the most popular cross-platform toolkits a generation ago."

That leaves one poor performing toolkit, that has an excuse at least. Not hard to avoid apps written in it, in any case.

Qt, Wx, Java, and many others don't or no longer perform poorly. So why the surprise there is one more? Maybe some folks don't know they exist.