BTC>What that means is it like “how strong your passphare is in my local hardware?”
Something like that. KDF params ballpark the time to unlock the wallet on the current machine.
This is estimated and set at wallet creation, so the machine you create the wallet on matters. Create a wallet on modern beast and it will take 10sec to unlock on your 2010 laptop. Do the opposite and it will take 0.1sec.
You have to option to pick the KDF params manually at wallet creation (in expert mode). Caveat emptor.