I moved ProJucer to /Applications and now it's great.
I use it to prototype modules that render music fonts which depend on spacing each character a few pixels apart. Once i figured out that it absolutely HATES having to deal with an incomplete class, it works great. If the class is incomplete, the JIT compiler will crash or stop responding.
That actually brings up a feature request. Whenever the JIT compiler crashes, focus changes from the code editor to the JIT messages window. If we could get a visual indicator of the window changing focus, that woudl be awesome. it's like how in Logic you have that blue line surrounding an active editor window (Arrange, Event List, Piano roll..). Right now i'll be typing and then i'll hear a bunch of system pings suddenly because the Compiler Messages window doesn't respond to keystrokes.
the workflow is: turn off Continuous Build, edit code such that class is complete in XCode and save, Cmd-Tab over to ProJucer and turn on Continuous Build, Instantiate testbed component, then develop class methods in xcode further until required functionality is achieved and cmd-tab between XCode/ProJucer to edit-save/test It's exceptionally good at getting very close to where I need my class modules to get very quickly.