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The generation took on my slow linux machine approximatively 10s CPU time...

sage: %timeit -n1 GL4dict = { g : None for g in GL(4,2) }
1 loop, best of 3: 9.29 s per loop

This is

sage: version()
'SageMath version 8.1, Release Date: 2017-12-07'

Please update to the new version, if there is such a big run time difference.