The secret to buttery smooth SwiftUI

The article explains why some SwiftUI views perform smoothly while others lag, attributing this to how views are structured and how SwiftUI's diffing engine works. Large view bodies with many primitive views cause performance issues because SwiftUI re-executes and compares every element on state changes. The real solution is to break views into separate structs, which act as checkpoints for diffing, preventing unnecessary recomputation. Additionally, implementing Equatable conformance and using the `.equatable()` modifier can optimize performance when dealing with closures or complex views.