So far I don't have problem with recovery speed.
For experiment sake, I have 14TB Western Digital USB3.0, externally connected to my desktop i5 12th gen, 64GB Ram (Win 10 Pro).
As a target disk, I use my external 5TB Seagate USB3.0 (it's external 3.5" HDD) but I took the hdd out and put it into my desktop using sata connector
for speed and mobility sake.
It shown on the screen that the remaining time is about 7 to 8 hrs -- to restore 2TB file(s).
To scan a disk is another story. Scanning a full disk (same ext. drive 14TB WD), using my laptop Lenovo Flex Win10 Home, i7 8550U(intel 8th gen),
16GB Ram, USB3.0 gen1, took me about 1 to 2 days -- to my best of knowledge, I can't remember the exact amount of time.
I'm using old version of R-Studio 9.0.190296.
I will see if I could do another scanning using the latest version of R-Studio. Even using the same version does not guarantee you to get the same result. As long as you get the files you are looking for then you're good. That's what matter the most, for me at least.

So far I don't have problem with recovery speed.
For experiment sake, I have 14TB Western Digital USB3.0, externally connected to my desktop i5 12th gen, 64GB Ram (Win 10 Pro).
As a target disk, I use my external 5TB Seagate USB3.0 (it's external 3.5" HDD) but I took the hdd out and put it into my desktop using sata connector
for speed and mobility sake.
It shown on the screen that the remaining time is about 7 to 8 hrs -- to restore 2TB file(s).
To scan a disk is another story. Scanning a full disk (same ext. drive 14TB WD), using my laptop Lenovo Flex Win10 Home, i7 8550U(intel 8th gen),
16GB Ram, USB3.0 gen1, took me about 1 to 2 days -- to my best of knowledge, I can't remember the exact amount of time.
I'm using old version of R-Studio 9.0.190296.
I will see if I could do another scanning using the latest version of R-Studio. Even using the same version does not guarantee you to get the same result. As long as you get the files you are looking for then you're good. That's what matter the most, for me at least. :)