Hello,
Back in December 2018 I started using Stellarmate/KStars/Ekos with a DSLR (D5300) as an imaging camera.
I just checked my archives - I was shooting RAW Native (NEF) and saving to both client and camera's SD card.
Image download time was about 8 sec.

Soon after I switched to an OSC camera.

My OSC died recently (sending it for repairs to ZWO tomorrow).

So, I tried to use a DSLR as an imaging camera tonight (just a test with simulators).
Now it's D5500 (about the same as D5300).

When I use RAW Native (NEF), the image download time is close to 20 sec now!
A bit too long...

When I use FITS, the image download time is down to 8 sec.

I am OK with using FITS but why such a big difference?
Why it was so much faster four years ago?

Thanks!

Today I prepared a new SD card (USB stick rather) with the latest Stellarmate 64-bit (basically a copy of the stick used in my first post)
and set it up to use with an AZ-GTi mount and a Nikon D5500 DSLR.
Used the same USB cable to the camera.

Now I am getting 8 sec download times with NEF and less than 2 sec with FITS.
Much better - I like this!
Don't understand why it improved though...

Now I have a copy of one of my first setups from almost four years ago.
My failed ASI2600MC is on its way to ZWO US service center.