It would be interesting or useful to know more about it, but what I think is that ideally a right impementation of a GC should not require any tweeks from the o

It would be interesting or useful to know more about it, but what I think is that ideally a right impementation of a GC should not require any tweeks from the outside... and I am pretty sure you are not going to get any signifcant performance boost by using different GC values than default.