It uses Impeller for iOS and will be rolling out to other platforms soon. It is faster than Skia and probably close to native or even exceeding it in some areas.

I would test performance before being sure it will be an issue. It's certainly an issue for me in real world, complex React Native apps. But I've seen apps like ByBit which is in flutter handle complex UIs very smoothly.

Also this comment is odd: "For instance, on Android, developers can use features like Just-in-Time (JIT) compilation or Ahead-of-Time (AOT) compilation for improved performance. "

Dart is a compiled language, it doesn't need JIT or OAT. It's also quite fast. It's about the same speed as Java while using significantly less memory. When flutter moves completely to Impeller the big change will be AOT compiled shaders and possibly other stuff like smaller binary and generally more optimized for the mobile use case.