In local testing replacing Element.renderObject's recursive implementation with an iterative implementation was 30% faster for AOT and 97% faster for JIT on x86_64, in the case where only one object was checked. (#112885). The difference should be even more dramatic for deeper use cases.

For most code this optimization isn't important but framework's most trafficked objects should be purged of recursion: ie framework.dart and object.dart (Widget, Element, RenderObject, etc.).