I’ve been building iOS apps since before Swift existed. Sure like I said if you code directly to UIKit and take a little care performance is good. It’s also very fast in Flutter with even less care. Rendering images in a grid isn’t hard unless your core abstractions are all wrong.
Now try that in SwiftUI. You’ll be forced back to UICollectionView.
That’s cool. I’ve been developing on Mac before Objective-C 2.0 and iOS since the AppStore was released. Millions of downloads, featured in the store, worked on dozens of projects from video games to MFi firmware, and have been invited to Cupertino to meet with teams.
I’m not defending SwiftUI. I mostly use it as a wrapper around NS/UIKit because it’s still buggy and not as flexible.
By the way, SwiftUI is also implemented on top of CALayers just like NS/UIKit. It can be fast in theory, but you have to know exactly where the pain points are and most developers don’t know how to do that.
Now try that in SwiftUI. You’ll be forced back to UICollectionView.