Mac OSX app - build smooth UI like Transmit app

Question

I'm working on UI for an Mac app, with lot of trying to improve for UI, but I could not make it's smooth as expected, :D. I want to build a smooth UI like Transmit app.

I also enabled core animation on all views, but it's really bad when I resize the window or moving the separator of NSSplitView.

Can anyone explain the problem here?, and is there a better approach to do what I'm trying to achieve?

Answer 1

Step 1: Hire a designer to make a smooth UI
Step 2: Learn how to work with Xcode, Interface Builder and Custom UI Elements to implement what the designer comes up with for you.
Step 3: Write code, test and iterate. Repeat as needed until desired results are reached.