The new build has only one yet very important change.
If you have over 100 matched or unmatched bets in one market, the program will display a summary of your bets rather than list every bet in a separate panel.
This will definitely improve the performance and cut down on the use of computer's resources.
The example of such summary is attached below.
Oh, and if you hate the "Getting Started" window, you can now turn it off by unticking the box in the bottom of the screen.