You can compensate for not just 50x but 500x by adding 2 characters to your password. If that's the speedup factor, it's not itself a big worry.
You can eliminate the problem entirely by using a random full-allowed-character-set password. The whole point of KDFs is that the password/passphrase is predictable (usually: by being generated from a seed dictionary).
You can eliminate the problem entirely by using a random full-allowed-character-set password. The whole point of KDFs is that the password/passphrase is predictable (usually: by being generated from a seed dictionary).