Duplicity slowing down/freezing my system since f30

Hi there.

I’m hoping for some hints or help about that issue I have ever since the upgrade to Fedora 30:
When duplicity is in a certain stage of backing up my data, my system becomes unusable. It’s basically frozen.

Duplicity always would turn up my fans, but now it’s really having an impact on system performance.

Did something fundamentally change in f30 that would have such an impact? Is there a feature I can switch back off?

I’m on a Lenovo T470s, Intel® Core™ i7-7600U CPU @ 2.80GHz × 4
Kernel 5.0.17-300.fc30.x86_64

Thanks a bunch!