What's better in regards to performance? type[,] or type[][]?

Question

Is it more performant to have a bidimensional array (type[,]) or an array of arrays (type[][]) in C#?

Particularly for initial allocation a

Answer 1

type[,] will work faster. Not only because of less offset calculations. Mainly because of less constraint checking, less memory allocation and greater localization in memory. type[][] is not a single object -- it's 1 + N objects that must be allocated and can be away from each other.