Apple rolled out a small update for Xcode Monday evening that improved performance when debugging Objective-C code. Xcode is Apple's app system for writing apps for the Mac and iOS.
Xcode 4.6.2 update improves stability and debugging support
Xcode 4.6.2 improved LLDB performance when debugging Objective-C code, and addressed several bugs that impacted stability including a problem that could cause the crash log database to bloat to a very large size.
Xcode 4.6.2 is free and is available for download at Apple's Mac App Store.