@Henrik No, I tried a lot of electron versions, a lot of raspberries, ATB, odroids. I created that electron topic :-D. I like it smooth, none of them was. All in all I have to say, that electron seems to be the problem. The renderer / the performance is too bad. Within chrome only, the website runs super smooth. With electron its a huge difference. Even under windows (8GB RAM, G4600 CPU), electron doesn’t perform like chrome does. But it’s okay, and expensive, :-D. MagicMirror V1 was a website only. Way better than V2 with the electron framework (only the performance aspect).
Perhaps @Mykle1 has an idea for MMM-voice under windows?