Using OS X 10.11.1 El Capitan, sometimes I'm confronted with a 'nonresponsive window': a program that keeps stalling for like 10-30 seconds. In most cases this happens to be Adobe Photoshop, but I've encountered it with other programs as well (e.g. Firefox or Chrome).
Note that the program isn't completely frozen or cashed, it's just doing some heavy calculations or whatever, and the window doesn't respond (I can't click or drag it) but eventually it comes back to life and continues working normally.
I can reproduce it, for example by having a very large image open in Photoshop and then going File > Save for Web.
While this is happening, I get the spinning color wheel, and I can't bring other program windows to the front. For example if Photoshop is stalling, I would like to cmd+tab to my browser or whatever and do something else there. But that doesn't work, the stuck Photoshop window remains in front of any other program I switch to.
Is there a way to hide or minimize such a program in OS X, so I can continue to work in others while this particular thing does whatever it needs to do?
Note that I do NOT want to force quit or kill a program, it need to keep running, it just needs to do so in the background, allowing me to use other programs meanwhile.
Edit: Cmd ⌘ Tab ⇥ still works, but Photoshop will not drop to the background whilst busy, as in this illustration…