Bokeh is for people who use software with big needs. When your Mac is clogged with lots of extra processes, the amount of power it can give to any one program is lessened. Running an intensive process like a Photoshop filter or 3D render can be sped up with Bokeh.

Focusing on a running application with Bokeh suspends all other apps in the foreground. Some programs may seem like they would require very little of the CPU, but could actually be hogging more than their fair share. By suspending these apps with Bokeh, your Mac will be able to dedicate maximum power to your present task. Defocusing will resume your other apps right where they left off.