Debug.Log statements and code performance

Something I've wondered, do Debug statements have any impact on code performance for compiled apps? Lets say for some reason you've kept Debug.Log statements in all your Update loops.
Does your compiled code run slower as a result?

 

I'm interested of this too, and also if the checkbox for "Development build" in Build Settings will turn of all Debug.Log completely when disabled.

 

Debug.Log is one of the most expensive single operations you can do in Unity. By default, it includes a complete stack trace of all your code, which requires stopping all executing, walking from where you call Debug.Log from and back through all method calls that got the flow there.

Having a few Debug.Log calls per frame will definitely cause a noticeable performance degradation.

As a general rule, remove all Debug.Logs once you don't need them anymore. It's a tool for quick debugging during development, and should not be used as a logging tool. If you need to output information because something's gone wrong, use LogWarning and LogError instead, and try to remove the causes of those logs when you find them.

 

https://docs.unity3d.com/Manual/BestPracticeUnderstandingPerformanceInUnity7.html

https://unity3d.com/learn/tutorials...ion/optimizing-garbage-collection-unity-games

 

Do Debug.Log run in non-development builds as well? I was under the impression they are automatically removed when you make a non-development build like other editor-only functions.

 

From the documentation:

https://docs.unity3d.com/Manual/BestPracticeUnderstandingPerformanceInUnity7.html