If you think that the stock Windows Photo Viewer is too slow, then you may want to give ACDSee Free a try. ACDSee Free is a simple photo viewer that doesn't feature a bunch of bells and whistles that slow it down.
ACDSee Free gives you a great image viewer that responds quickly. Zoom in and out of photos with the '+' and '-' keys or quickly set it as your desktop background from the 'Tools' menu.
Another cool feature of ACDSee Free is its print controls. Once you're done viewing your photographs, you can quickly access print settings to make sure it fits on the specific type of paper you're using. There are tons of print options for users to tinker with to get the best possible results.
ACDSee Free's greatest strength is also its greatest weakness. Yes, ACDSee Free is lightweight and quick but Windows Photo Viewer isn't a slouch either. Since Windows Photo View is included with Windows, there really isn't a good reason to seek out an alternative photo viewer.
Overall, ACDSee Free is a good, speedy photo viewer but it could have included a few more features to differentiate itself from the stock Windows Photo Viewer.
ACDSee Free supports the following formats