local or global performance

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767pilot

If a variable is local or global does that have an impact on the overall performance of an application ie speed, memory.

I know the difference between local and global within a program but as I need to keep tabs on several variables (the debug in blitz is shat) I output them on to the screen; i usually make them global but am thinking that i could make most of my variables global and not worry that i cant access them etc