On Monday, June 4, 2018 at 11:10:34 PM UTC-7, Jeroen Demeyer wrote:
>
> It would be useful to have a concrete MatrixSpace.__call__() call 
> showing the regression. 
>

I suspect that the main slowdowns I am observing are due to the reduced 
performance in examples like

M=matrix(GF(37),9,9,range(81))

[M.new_matrix(i,j) for i in range(1,50) for j in range(1,50)]

and

[M.new_matrix(5,6) for i in range(1,50) for j in range(1,50)]

etc.(i.e., both the case where a lot of different parents are constructed 
and where the same parent keeps reoccurring). As far as I can see both of 
these perform dramatically worse now.

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