@epixoip @alx , My understanding based on the documentation is that the vault are only based on the client side rounds, not the server side. They are only used for the auth / online hash.

Default rounds for really early users where 500 and after a while 5000 later they changed to 100100.

https://www.lastpass.com/-/media/175854c49fcb489baeaa87e78579e28f.pdf