Yesterday I was in CostCo and my Nexus 6 ran quite warmly. It was the Moli TV doing something in the ground. I opened the Swiss knife - Tasker, added the following profile and task to kill it whenever it is in the background.
New profile, Application, 魔力视频, link to it a new task:
Code, run shell, am force-stop com.molitv.android.v2, use root.
Now go back to the profile, add to it an exit task, link it to this new task as well and unlink the enter task.
From now on, I can still open this app and use it normally to watch TV, it just won't have a chance to run in the back ground.
I did the same for TV Plus. Those are pretty much the only two Chinese apps I use that have no reason to run in the background.