Speeding up the Comp Window

Lowering the resolution of the Comp window can dramatically speed up previews. For example, switching from Full Resolution to Half Resolution speeds up previews four times (as it reduces both the width and height in half). In fact, previewing at half quality with the comp window set to 50 percent often provides a perfectly acceptable preview. To switch preview resolution quickly, use the following shortcuts.

For Full Resolution	Cmd+J (Ctrl+J)
For Half Resolution	Cmd+Shift+J (Ctrl+Shift+J)
For Quarter Resolution	Cmd+Option+Shift+J (Ctrl+Alt+Shift+J)