Will NSLog slow my app?

Question

I have a lot of NSLog's in my app - some of which often print large amounts of data - ie results of a search. Will this make an appreciable difference in the speed of my app?

I'm not familiar with macros - would someone be able to suggest one that would enable/disable all NSLogs?

Answer 1

Yes NSLog could make your app slower because of its synchronism. To toggle all NSLog

#ifdef DEBUG
#define NSLog(...) NSLog(__VA_ARGS__)
#else 
#define NSLog(...)
#endif

Answer 2

You should use something like DLog from MY CURRENT PREFIX.PCH FILE. It'll disable logging in the Release build. This is a great explanation of why you shouldn't keep NSLog's in the Release build.

Answer 3

If your app is for production try to minimize them. Keep only the ones useful for errors or possible warnings. If you used them for helping you debug, then I advise you to remove them.