I must admit, that usually I haven’t bothered switching between the Debug and Release configurations in my program, and I have usually opted to go for the Debug configuration, even when the programs are actually deployed at the customers place.
As far as I know, the only difference between these configurations if you don’t change it manually is that Debug have the DEBUG constant defined, and Release have the Optimize code checked of.
So my questions is actually twofold:
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Are there much performance differences between these two configurations. Are there any specific type of code that will cause big differences in performance here, or is it actually not that important?
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Are there any type of code that will run fine under the Debug configuration that might fail under Release configuration, or can you be certain that code that is tested and working fine under the Debug configuration will also work fine under Release configuration.