When it comes to a radiator, a little bit quickly adds up to the same as a lot slowly as far as flow goes. It's how efficient the heat transfer in the block is that should make a difference if the radiator is not overloaded by being too small or bad airflow through it for example. Also getting the heat out of the block as quickly as possible will keep excess heat from being stored in the metal of the block. I think faster flow with the right radiator and block designed for it should be better than a low flow settup.
my $0.02:shrug:
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