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Speed up calculation of left kernel

Is there any way to accelerate the calculation of the left kernel of a matrix? It could be by allowing sage to use more memory or using some parallelism, for instance.

I have a 1230 x 74 dense matrix over Integer Ring

A = Matrix(ZZ, 1230, 74)

and when I try to use


the calculations doesn't finish (it has run for three days and then I interrupted the script).