Sometimes you just need to turn around images really quick when photographing an event like a wedding or party, maybe a concert or show…even just a quick portrait session. Waiting for Lightroom can feel like an eternity, so we can use another program called Photo Mechanic to quickly browse and rate our images.

Photo Mechanic is a lightweight piece of software that actually displays the same JPEG preview image that your camera shows on the LCD screen. Lightroom’s raw processor is what generates the previews, but Photo Mechanic doesn’t have a raw processor because it’s using a camera-generated preview…so it’s blazing fast. There’s almost no waiting to view your images and the only time it’s been slow for me happens when my computer is running slow….

Source: Stop Waiting for Lightroom to Preview your Images