I am curious if you can you speed up the video editing process if you add a External SSD drive like the Samsung T3 500gb SSD unit? The iMac I am looking to buy isn't old ( late 2015 ) and it has the 4K display but has the standard spinning type 1tb hard drive. These Samsung T3 external SSD drives are about $200 for the 500gb unit, but they are supposed to be really fast. Anyone using this kind of setup for 4K video editing?