Optimizing managed C# vs. native C++ code...
A line-for-line translation of the original C++ code into C# ran 10 times faster than the C++ code.
It took five different optimizations (one of which introduced a bug) for the C++ code to match the speed of the unaltered C# code.
After Raymond's sixth optimization, his C++ code finally beat the C# code because the runtime got down to where the 60ms startup overhead of the CLR made a difference!
To accomplish this, Raymond had to:
* Write his own file/io stuff
* Write his own string class
* Write his own allocator
* Write his own international mapping
So yes, C++ code can be faster than C# code but when you look at all the work Raymond had to go through to achieve that, you have to ask yourself "is it worth it?"
http://blogs.msdn.com/jonathanh/archive/2005/05/20/420634.aspx
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