After reading you and checking the links, I am now sure the unlocking latency is not due to the number of iterations. First and foremost, because I'm using the

After reading you and checking the links, I am now sure the unlocking latency is not due to the number of iterations. First and foremost, because I'm using the PIN entry. And it already takes some very noticeable time to open. I do not, however, notice too much difference between using PIN or the passphrase. So the delay must come from other unrelated limitations. Thanks for all the useful info!