Zooming in and out faster in Photoshop

If you want to zoom quickly to 100% view, double-click on the zoom tool. If you are in 100% view, you can scroll or pan to another part of the image by pressing the space bar. That works with every tool. The cursor will change into the hand tool, so you can move the image by dragging. When you release the space bar, the cursor goes back to the toll you were working with.

To zoom in or out to ‘Fit on Screen’, double click on the hand tool.