Could be way better with few improvements

There are too many huge flaws that completely destroy the efficiency of the IDE:
- Code completion is super slow to be updated when updating symbols, this requires the user to build the project by himself
- Many IDE crashes
- No refactoring for Swift (can’t believe this is real)
- Compiler super fragile that raises misleading errors frequently
- UI editor buggy, even adding a button to a controller fails very often

Slowbrro about Xcode, v8.2.1