Added in: I ran a quick check using an image folder from a small astro project I am working on. The folder contains 101 X-T30 full size raw image files each being stored as 55.9 MB files in size. These were all converted to FITS format using Siril, an astro-photography image processing program. It reads each image into ram, converts it into FITS format and writes the converted file back out to disk, these will be used for actual processing. So, for 101 55.9 MB  raw files ---> 101 52.1 MB FITS files, Siril reports that it took 3.68 seconds. I am fairly certain the 10 Gb NVME enclosures can handle the larger 200 MB GFX files without any troubles, of course the 40 Gb enclosures can as well. https://siril.org

I use a USB 4 NVME enclosure with a Samsung 2TB SSD, but I just about always, but not completely, use it connected to a desktop computer. The SSD itself is faster than the USB or Thunderbolt ports can transfer data, this is true for just about any NVME SSD, but that is not a problem, the data is moved back and forth as fast as the computer can handle it, later I can give you some more concrete ideas but roughly turn several hundred X-T30 full raw files into FITS format and process them as fast as you please. I use a handful of SDXC, etc. cards out in the field, it is easier than worrying about connecting cables and stuff in a hurry. The T9 and other 10GB enclosures should be pretty good, those are no slouches at handling data.

🤭 🤣 That one ranks up there with your saying from long ago: “Read The Fuji Manual”.

You are welcome, @BIGOAK, sir. We have just scratched the surface here, there is a lot more to it. 

The 16” M2 Pro 16/512 is a little over 2K € NOS here in Slovakia incl. 20% VAT which gets refunded of course if you buy as a company.   When you mention the enclosures, @jerryy, for 40MPix files perhaps the 10Gbps enclosures are better because they are plenty fast IMHO and they spend less power (about 200mA as opposed to 500mA for the 40Gbps ones, for the ones I have measured), so when you run on battery that makes a difference. Fewer charging cycles, longer battery lifespan. Maybe they are plenty fast for 100Mpix files too, perhaps someone can chime in with their experience.  But talking about the 10Gbps ones, you may just as welľ buy a Samsung T9 which will be equally fast and maybe even cheaper, depending on what NVMe drives you happen to have at hand.  Also, you could connect the drive to a hub with its own power supply, but they usually charge the computer full time through the Thunderbolt port so if you are a purist and want to cycle your battery kindly, somewhere between 20-80% to prolong its life expectancy, the hub will disrupt your strategy. 😁  But do not despair, Acasis makes an eclosure/minihub which takes external power from an USB charger but does not charge the laptop so you can charge that extra to your heart´s content. Maybe automate that through a smart plug based on battery level events. 😁   A beautiful world we have, don’t we. Computers are great, they help us solve problems we didn’t have without them.