If you just want to view images, I HIGHLY recommend you give Irfanview a try. It is mainly an image viewer, but it is extremely light weight and can also scale images to make them look better in full screen(since your camera is taking images far bigger then the screen resolution) without much performance loss.
Irfanview is much slower(5-6 seconds vs 0.3-0.4 seconds for the jpeg image) at opening RAW images(and lacks many features for dealing with them) so I would recommend sticking with normal(jpg) images.
The image conversion gets better(they have a basic save for web and devices similar to photoshops(optimize for web and devices). Jpeg compression is not as good as photoshop yet, but make sure chroma subsample is OFF if you compress lots of reds) all the time on this program, but watch out. I do not remember it coming with any kind of browser bar offers or anything, but things like that can be tossed into freeware installers.
http://www.irfanview.com/
EDIT.
If you use Irfanview, hit "Options -> Sort Directory files -> By extension" so it does not open jpeg then raw then jpeg then raw if you are saving raw images then using the full screen slide show.