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c9b0dcd733b94c8a3faf3f110c2d4823aaaa337c
the cacheOptimal is only good for large enough matrices. When taking a block in a fixed-size (hence small) matrix, the SizeAtCompileTime is Dynamic hence that's not a good indicator. This example shows that the good indicator is MaxSizeAtCompileTime. Result: +10% speed in echelon.cpp
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