A smaller theatre I work with has a lovely iMac 5k that has the high end specs that had been refurbished so we got it on the cheap. The only flaw with it is it carries a regular 7200 RPM hard drive. I'm already aware of how difficult it is to open a new iMac ("moderate" actually) so I was thinking concerning playback of large video files would I get any benefit from using a external solid state in a enclosure? Or does everything get routed through the hard drive on its way to whatever its doing and wouldn't matter anyway? Would getting a thunderbolt capable SSD make a difference over USB3 also? If thats not a option then I'll just wait until the next show closes and give myself a couple of days to tear it open and replace the drive. Thanks!