For what its worth, just for the record, here is a benchmark of the (old) version 2 of the ASIAIR (Raspberry Pi 4) when connected through the Ethernet port of the ASIAIR.
The other end of the Ethernet cable is a eero 6 mesh router, to which an M1 Mac mini is also hardwired.
I used ASIAIR to capture 100 frames of data from an ASI2600MM. Each FITS file is 52.2MB in size.
I then connected the Mac to the ASIAIR's Samba sever and downloaded the entire 100 FITS sub frames (ignoring the JPEG thumbnails) to the Mac.
At the ASIAIR end, the data is saved to a Patriot RAGE Elite USB memory. The RAGE is supposed to have a 400 MB/sec read speed. My other ASIAIR has a Samsung T7 SSD, which is faster, but it is outdoors, and I didn't want to go out in the dark to connect a camera to it, so I am using my indoors setup. In any case, the RAGE should already not be the bottleneck for measuring LAN transfer speed.
macOS Activity Monitor shows a transfer rate of about 99.5 MB/sec (equivalent to about 800 Mbps , not counting packet overheads).
Not quite hitting the max of 1000 Mbps of a Gigabit LAN, but not too shabby either -- not making it to 1000 Mbps could be caused by the eero 6's Ethernet switch or the M1 Mac Mini's gigabit implementation or the USB Flash drive, instead of the ASIAIR's Samba or Ethernet implementation, but I suspect it is the latter.
As a sanity check of the speeds, the entire 100 subframes of APS-C sensor (5.22 GB) finished copying in just about 1 minute.
So, there you go -- a real transfer speed of about 800 Mbps with the old ASIAIR. We can compare this with the version 3 ASIAIR's WiFi speed when someone finally benchmarks it with actual FITS file transfer. (An AC1200 class WiFi router can transfer about 900 Mbps on the 5 GHz band.)
Chen
