Compiled in debug might be a red-herring, but it can have an big effect on performance.
On Visual Studio there is a supplied configuration called Debug; configurations are a way of grouping different compilation options, although they can be used for other things. Using Debug, the symbol table will be attached to the code for debugging, as you would expect, but it has other effects: it disables all optimization and uses a different heap management system.
So far as I am aware the -g option on gcc does not have those side-effects (stepping through optimised code in a debugger can be weird).

In reply to Re^8: Why is Windows 100 times slower than Linux when growing a large scalar? by cdarke
in thread Why is Windows 100 times slower than Linux when growing a large scalar? by Anonymous Monk

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