High CPU load during download

[genodeftest]

During download of the fedora image, mediawriter has a very high CPU load of almost 100% on one core.

Steps to reproduce:

1. Open mediawriter
2. Download a fedora image
3. During download, watch CPU load

What happens: High CPU load of >80% on one core

What should happen: Almost no CPU load at all. wget can do the same with way less CPU load.

Version info: mediawriter-4.1.4-4.fc32.x86_64

[grulja]

Is this still a problem with FMW 4.2.1?

[genodeftest]

Yes, this is still a problem (btw: Even when idle, the application eats quite a lot of CPU ressources, constantly running around 10% on my CPU)

Tested with mediawriter-4.2.1-2.fc33.x86_64 on Fedora 33 / GNOME+Wayland session