Android M Developer Preview 2: Quick Look at What’s New

Memory Setting

It's worth noting that this is a developer preview, so everything we are seeing could be different on the official release. Things like the System UI tuner may be removed, and this new Memory option in settings could just be here temporarily for developers.

That said, scrolling through the settings is a new "Memory" category. In here we see how much memory is being used, how good (or bad) the performance is, total memory and how much is free, and even a drop down to see what apps are using the most memory.

If performance starts to suffer, check here and kill apps wasting more memory than they should, as long as it isn't something you're currently using.