but on retina displays they are tiny! Is it possible to adjust preview settings in Bridge?
I'm not familiar with retina display other then on my iPad and iPhone but they don't run Bridge.
Can you provide a screenshot?
And how do you use the 100% preview, with the loupe, full screen?
Have you also tried to purge the cache for this file (select and use right mouse menu 'purge cache for selection)
To my knowledge Bridge CC supports Retina, one of the reasons the AOM was canceled because this does not support Retina.