Bip39 vs https://send.now/zchzg5fu4oku Let us suppose it will be 10x faster in comparison to the GFX card over so about 2,4M hashes/s. A typical attacker will own several this kind of specialised products. Thanks to the cryptographic style of BIP-39, a weak passphrase doesn't reduce the security of another wallets https://bip39marco.mystrikingly.com/