The final solution to Adobe CS6 Bridge being slow is this:
Copy the Adobe Camera Raw.8bi v8.3 into the C:\Program Files (x86)\Common Files\Adobe\Plug-ins\CS5\File Formats folder. This way, you will get all the metadata, AND when you press space bar to preview the images, you get the full embedded jpg view.
You have to right click, “Open With Photoshop CS6” and ACR 8.3 opens without a hitch. But if you right click and select OPEN IN CAMERA RAW you get the “unable to use the Camera Raw plug-in. It is not compatible with this version of Bridge.” (leading me to believe if I had really great programming skills, I could remove that version checking that would allow it to launch on a double click. Maybe someone other than me can figure that one out.)
On the rare occasion I really need to tweak a jpg in Adobe camera Raw, I’ll just use CS6 to do so.