I have just bought into the I.C.O for NVO. It is going to be the replacement for Polo in my opinion. It should never lag as it is decentralized and you also allways control your private keys!
Link bellow.
https://nvo.io/index.html
The Safenetwork is decentralized and doesn't rely on the traditional routes or ICANN. By employing a validator on the Safenetwork for orders validation, a P2P trustless decentralized exchange can be created.