The wallet shall be completely revamped, it is terribly unoptimized. Look at zetacoin's wallet for a faaaaast wallet. Why Mintcoin's wallet is so dull is beyond my understanding (no, this is not because of PoS; I have other PoS wallet and they work fine).
If Mintcoin had a wallet like Silkcoin has (Best wallet out there...bar none) it would really add a lot of life to Mintcoin. Their wallet is quite fancy and does so much more than just hold your coins. If you haven't seen Silkcoins wallet, I encourage you to download it and have a look at it.