Fastest external drive I can run OSX on - 27" iMac late 2015 USB 3.0 & Thunderbolt 2?

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t is a complicated wish mash of abbreviations, acronyms and hardware specs and I am just starting to understand it.

I Bought a 2015 iMac with a 1TB HDD recently and as my last iMac had an internal SSD it all feels very slow. I bought an external SSD and an enclosure and it works well booting Catalina but can I get things to go faster? I got a SATA 3 SSD and a USB 3.0 enclosure and it works ok but wondered if it could be improved upon.

I keep seeing NVME drives and they seem faster but they would be throttled by the USB3 and was far as I know there aren't any thunderbird NVME enclosures.

Thanks
 
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