These two FDE solutions are similar, but I noticed different executions speed: specially mounting a device it seems that Veracrypt takes more time decrypting it. So I would like to compare it with LUKS analizing the header format.

I know about LUKS that there is a 2 level key hierarchy and 8 keyslot, maybe Veracrypt is similar.

My question is: how Veracrypt's header is designed?

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Both of them will have varying times depending on iteration count:

LUKS hides this somewhat in most Linux distro installs, though it can be changed afterwards, per this Stackexchange question

Veracrypt makes setting the count trivial - use and change the "PIM" setting.

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