I am the developer of librawFX (https://github.com/lanthale/librawfx) and I am using with this way libraw. Generally all is working well and also the speed is good for reading raw files.

Nevertheless if I open Canon/Nikon file it takes 1-2 s to open the file (max. 3s). Opening a Sigma file takes around 3s. But if I open a fuji x-trans file it takes 15 - 20s.

Do I have to ship some extra libs to get here the same speed as with Sigma files ? Or is it a bug actually that it takes so long ?

Thank you in advance for your help.
Clemens