i have a 2012 Mac mini with a 1tb hdd. The drive is nearly full. I have cleaned up the drive as much as I can. I have 500gb of photos, 300 gb of music and movies' 70gb allotted to "library" according to daisy disk and approx 50gb in Dropbox with the rest documents. The mini is primarily used for storage of photos and music. Occasionally I will use it to work on a presentation and email/browsing. It's almost unusable at this point due to its slowness. We use iPhones, iPads and a MacBook much more than the mini for day to day stuff. Would I be better off putting the os photos library on an external drive or adding an internal ssd? I do steam iTunes to an Apple TV frequently and assume that works better if the library is on the internal drive. If I go the external hdd route would a thunderbolt drive be noticeably faster if I'm just using it for os photos? Any help is greatly appreciated!