Right now you have the option to have window sizes decrease when not selected as well as have their opacity decreased, what would be really handy would to also have the option for windows to expand on select and contract on deselect. It would be especially useful for the iPad screen where you have l...

Here is what I found can help with the available memory, especially in ios11 since it has more multi tasking. Try going on your iPad to settings >general >background app refresh, turn it off, or turn all off except for paintstorm. I was having low memory and that seems to have fixed it.