Patrick has posted an interesting article on foreach performance stating that a for loop with an array is up to 5 times faster than the same code executed in a foreach on List<T> (assuming the contents is the same, just the container type is different). This wont affect most of us, however if you have a situation with nested loops this could be a significant performance improvement.
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It looks like in his comments that some JIT magic makes the results slightly different on subsequent running of the code.
I wonder if using N-Gen would further affect these results. Well I dont need to wonder, I should just spike it out.
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