First of all: Thank you for this nice peace of software!!!
The speed is related to the different version states of all the involved packages, even under python it took (depend on the versions installed) quite long to export and under Ubuntu 20.04 I was confronted with a memory buffer overflow).
Now with Julia 1.7.0 I have the impression it works fine. The version that is automatically installed on
my window machine is v5.19.16 (python is v3.9.7 from conda-forge).