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@Well_is_it
Been booting from an external SSD on my work iMac for a couple of years – it's a Samsung 850 Pro 256 in a USB 3 enclosure with UASP.
The write speeds have tanked in the last few months... Still 50% space available but I think it might be the lack of TRIM over USB (although in theory, UASP should support it, maybe.
It should be about 450 read and write but I'm seeing writes drop below 100 now. Reads seem ok.
Gonna leave it powered on tonight to see if its garbage collection kicks in and re-test tomorrow.
It's still better than the internal 5400 rpm spinning rust...
I think what I need to do is borrow a thunderbolt enclosure so I can force a TRIM command, or use a spare slot in Mac Pro...
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