In Settings > Configure Kdenlive > Environment there is a setting for "MLT Processing threads" which is at 1 by default and allows (on my machine) a max value of 3. Now clearly this is about multithreading MLT, but I'm just wondering which parts of Kdenlive this setting would affect?
Playback in the monitor?
It also says >1 is experimental. Does anyone have any idea of *how* experimental it is? Do you have any experience with trying this?