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Asked: 2026-05-10T22:42:30+00:00

I’ve just upgraded a native C++ project from VS2005-SP1 to VS2008-SP1 The first thing

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I’ve just upgraded a native C++ project from VS2005-SP1 to VS2008-SP1
The first thing I tested was a very basic functionality test of the application and the first thing I noticed is that the main number-crunching algorithm performs three times slower in the VS2008 binary.
I tested again the VS2005 binary to make sure there isn’t any other difference and it still performed as it did before.
Did anyone stumble into this?

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1 Answer

  1. Strangest. Thing. Ever.

    It seems that the project upgrade wizard of vs2008 simply doesn’t copy the ‘Optimization='2'‘ property so the new project is left with no optimization in release.

    The fix was to go to the properties dialog, change optimization to 1 and then back to 2. compile again and everything works it should.

    I couldn’t find any official reference for this only this obscure reference in an MSDN forum.

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