Nah that isn't really true.
I run my server on an AMD 2700X and voice assistant without GPU acceleration with a medium sized model takes normally under 3s. It doesn't even spike my CPU usage to a very high level. Just don't use a raspberry pi for it lol.
I was talking about the "nabu" platform that they use in the source code more. I have never seen that "platform" before and it is not a component. It isn't listed in ESPHome documentation at all.
Normally you cannot use a media player and a speaker component at the same time. You can use voice assistant with a media player but there seems to be some bugs. If this "nabu" platform does not require cloud integration and fixes those issues, that is huge for the DIY voice assistant satellite building community.