What is the performance penalty for using MVector and MMatrix vs SVector and SMatrix

General Usage
1

How do the two data types store data underneath?

As a more general question, when is an SVector or SMatrix allocated on the stack? Are MVector and MMatrix ever constructed on the stack?

2

If the mutable type does not escape, it can be stack allocated. For example: Help with allocations (variable length least squares) - #6 by lmiq

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3

Most of the time MVector is fast, but in some cases not. So benchmark your code and make sure there are no allocations.

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