I just updated to Marshmallow 6.0 OS for my Samsung Galaxy 6 smartphone and immediately had poor performance with apps like Pandora and Netflix via wifi connection. If I turn off wifi and use data, no problems. This is true with any wifi connection, so it's not just my home wifi network. In addition, I am having other issues with my phone after the 6.0 update. Those other issues relate to the voicemail errors and a decrease in battery life after the update. I would like to go back to 5.0 OS Lollipop since that was much more stable and I experienced no issues. I have since instructed my wife and others not to do their OS 6.0 update given the issues I am having along wtih many, many others. The new OS update is full of PROBLEMS and needs to be addressed immediately by Samsung/Verizon Wireless.