PTP read-out from Fuji X-T100 extremely slow

Hi,

I found that listing files or just trying to pull one file from my Fujifilm
X-T100 using gphoto2 takes a very long time. (The same is true for whatever
backend Gnome uses - I did notice it was faster when there were fewer
images on the memory card of the camera).

I tried with both -L, to list all files, and --get-file=1. In both cases,
gphoto2 seems to go through the info for each file (object?) (To get
filenames?) and each read-out takes about 200ms. (Logs at [1]. Also tried
with gphoto2 2.5.15 / libgphoto2 2.5.16 on another computer)

Is there any way to avoid these reads? I guess they are needed to map
filename to object?

Is there a 200ms wait performed by gphoto or is it my camera?

I tried searching for the problem. The closest I got is that the Fuji
PTP/IP protocol does not have unique object IDs [2]. Going by how
consecutive the numbering in the debug output is, this might be true for
PTP over USB as well?

What I ultimately like to do is pulling a number of images (not all) from
the camera within a number of seconds. Getting previews is not necessary.
If necessary, I could resort to some kind of cache file and not delete
images from the camera (to avoid object remapping, if the non-uniqueness is
true).

(In the long term I was thinking of only extracting images with a certain
"star" rating in the Exif data)

Best Regards,
Thomas Axelsson

[1] Logs: http://www.lysator.liu.se/~axl/gphoto2/

[2] https://www.shuttersnitch.com/forums/viewtopic.php?f=39&t=1880
"* The Fujifilm PTP protocol doesn't assign files a unique ID. In short:
Please don't have more than 50-100 photos on your card unless you like
watching slow progress bars. (ShutterSnitch can't keep a cache and
therefore needs to download the file information each and every time.)"

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