Over the past few days a group of 4 of us have noticed a massive frame rate drop when taking over New Venice and Riverside Gas Station on level 4. There are a lot more particle effects on screen but it would normally only take me down to 48fps, this time however it often dropped below 20fps and at a few points down to about 4. We have all got different hardware so it's unlikely to be a driver thang. Never had this problem before the update.