and why the file extension change?
I think you will find a setting under preferences (from memory) that 'changes to .ino'.
This may resolve this situation you have.
Personally I haven't found it slower, but you can still download and use ver 023.
As I understand some code needs changing because they have changed some keywords in (Wiring.h ???).
I found it when trying to load an old sketch that worked in previosu versions, using Ver 1.0 into my Nunchuk controller Robot.
In the end I went back to 022.
Mark