The other day I checked this box in the settings. The audio got slow which helps to understand better when native people speaks quickly, but it happens that slows the entire show even the long parts where there is no dialogue at all. Changing this manually every time is very tedious so I ended up not using the feature and wishing the app could get slow only when there is dialogue in the show.
We used to have this feature
I’ll try make time to build it back in.