If you have a PC, download this software
First, it is fast in everything it does. In the time it takes Photoshop to load I have already edited and processing a few photos in FastStone.
It displays and edits RAW photos from Canon AND Sigma cameras.
The more you use it, the more you realize you are in the hands of a software developer who ACTUALLY LOVES photography as much as you do.
My only complaint is I couldn’t find an eye-dropper tool for the color balance. Then I started playing with the Red, Green and Blue sliders and realized I should just grow up and color to my taste, which I now do. Quickly of course–everything in FastStone is fast.
Want to process all your photos in batch mode? Oh it does so many things. I simply love it.