Hey guys, I've ordered my very first iMac and I'm a huge fan of SSD's. But because configurations where fixed I had to order one with the 1TB fusion drive. Because this is a big limitation of speed I searched around to have a solution for this and it appears that there are 2 choiches with similar speeds. Install OSX on an external drive with: 1) USB 3.0 with UASP enclosure (I already have one) 2) Thunderbolt enclosure which will cost around 100€ more I was watching an youtube reviews and there it appears that boot times from an USB 3.0 SSD aren't that good because the iMac has to start the USB controller or something. It took like 20s before it started to boot, once booted it worked great. An other disadvantage is the absence of trim but a samsung 850 pro 512GB has a very good own carbage collection which keeps the speeds high (from other reviews). Now for thunderbolt, I know this behaviors differently but I don't understand everthing about it. Is it correct that Thunderbolt is a more direct connection? Will it have the same waiting delay before booting up? I know for sure that Trim can be enabled so choosing a thunderbolt enclosure with a samsung 850 evo 512GB will have the same price as USB 3.0 with a samsung 850 pro 512GB with roughly the same performance. As last I've read that thunderbolt doesn't consume CPU processing power, which reinforces my thought about a direct connection. Is this correct or will there be no improvement on boot times for thunderbolt compared to USB 3.0 with UASP.