Hmm doesn't that sound like Apple's Tahoe/iOS 26? Effects upon effects upon more effects.

iOS 26 runs surprisingly smooth on my iPhone 12 Pro Max though.

Runs like crap on my daughter's 12 mini.

Actually what does "surprisingly smooth" mean? Better than you expected? Or actually smooth?

I had an Xperia for a while but kept my iPhone and then installed the iOS 26 beta on it. Expectation was that it would run but be pretty painful. Surprisingly, even the beta ran so fine that I sold the Xperia and switched back to iOS. And it's still my daily driver.

Not really. Ironically, WPF designers wanted to make things better by offloading the rendering onto the GPU. They also added DirectWrite that was supposed to provide high-quality text rendering with all the bells and whistles like layout for languages with complex scripts, in hopes of eventually offloading the text rendering as well.

But they just plain failed to execute well on this idea.