hashcat speed when using a text file of NTLM hahes

[penguinkeeper]

Nice speed! This is perfectly normal and is due to some of the optimisations that are lost when you go from a single hash to multiple. With a single hash, we can reverse parts of it so most of the time, your GPU(s) don't actually need to perform the full hashing calculations, whereas for 2 or above hashes, Hashcat can't do some of these optimisations, like the one I mentioned, called "Early Skip".