In regards to the find and replace, you can actually rename a variable or function by placing your cursor in it and hitting Cmd+Ctrl+E (that may not be the right shortcut, but I know there is one). No danger of changing something you didn't want to change.

As far as the file stack goes, I'm not really sure what that does; but Xcode has other navigation options, like tabs, and files can be switched with the fuzzy finder.

You are absolutely right about the instability—that's the reason I switched away from Mac/iOS development. Too many weird bugs, in Xcode and in Swift. I haven't found it too slow on an SSD but when I used an HDD the speed was horrible.

> ( it is actually faster to run in it inside VirtualBox than XCode natively ).

Is there anything special you're doing with VBox? In a Windows VM, Eclipse is mostly usable, but disk accesses (or something) have incredible latency. It makes opening a new tab take a few seconds.