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Global variables are really slow, in addition to all the other reasons not to use them.
Master C and Embedded C Programming- Learn as you goUsing global variables causes very tight coupling of code. Using global variables causes namespace pollution. This may lead to unnecessarily reassigning a global value.
The first is that allocating global variables may be faster, since they are only allocated once, at the time the program is first spawned, whereas local variables must be allocated every time a function is called.
Coalescing global variables causes variables that are frequently used together to be mapped close together in memory. This strategy improves performance in the same way that changing external variables to static variables does.
For clarification: I know how evil globals are and when not to use them :)
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