@lore You probably have thought about this, but I would recommend recompiling those programs to target your machine architecture. I don't believe it makes a huge difference, but sometimes it's noticeable, especially in video applications. I do that with ffmpeg and MPlayer and I think it's worth it. I've never tried with Kdenlive, though, because I don't use it.
@josemanuel soon enough you're recompiling everything and hello Gentoo 🤣