you dont specifiy what kind of performance you need and where (ui, targeting, clicks ...).
out of the box you will not got the great performance, but put redis and mongo into the game and you can handle a small ad network and scale up to a medium one.
check revive-adserver //.// com (ex openx open source) too.
don't forget both products are backed up by commercial companies who like to sell consulting and fro msome level their enterprise solutions to you, but with the right konwledge or money in the pocket you will bring both solutions to fly
