Potential switch to sparse matrices for monomial orderings #16562

Job	Run time
doctest (1.10, ubuntu-latest)	25m 59s
doctest (1.11-nightly, ubuntu-latest)	24m 5s
doctest (nightly, ubuntu-latest)	26m 55s
doctest (1.10, ubuntu-latest, depwarn=error)	23m 24s
test (1.6, short, ubuntu-latest)	7m 14s
doctest (1.10, macOS, RPTU)	11m 20s
test (1.6, long, ubuntu-latest)	6m 57s
test (1.10, short, ubuntu-latest)	5m 36s
test (1.10, long, ubuntu-latest)	6m 34s
test (1.11-nightly, short, ubuntu-latest)	15m 49s
test (1.11-nightly, long, ubuntu-latest)	9m 34s
test (nightly, short, ubuntu-latest)	14m 5s
test (nightly, long, ubuntu-latest)	8m 38s
test (1.10, short, ubuntu-latest, depwarn=error)	5m 53s
test (1.10, long, ubuntu-latest, depwarn=error)	6m 0s
test (1.10, short, macOS, RPTU)	5m 29s
test (1.10, long, macOS, RPTU)	5m 0s
test (1.10, book, ubuntu-latest)	34m 56s
	4h 3m 28s

Provide feedback