Ok, maybe only a lot of disk/memory usage.

But:
I think most users use ProgDVB without activated timeshift; if you then spontaneously need a break (telefon ringing, toilet, ...) it is not comfortable to go to the preferences menu, activating timeshift, having "black screen" for some seconds after ...

Additional to the toggle of Timeshift in the preferences please add a button to toggle on the main screen.

The idea is to have the possibility to "stop" the TV even if Timeshift is not activated in the preferences. It costs a lot of performance if Timeshift is activated but not used. On the other ...