I am still not satisfied with the battery performance with Stage manager off. It made things a bit better but there is another problem that I found today while playing around.
For some reason today with only Safari open playing one video my battery consumption was about 12 watts which is much too high.
After staring some time on the information page of iStat Menus I noticed the following:
If you watch the area named "Bilder pro Sekunde" which is german for frames per second, you will notice that my display is updating with about 119,9/120 frames per second. Per default my M1 Macbook Pro which uses the Pro-Motion technology uses a variable framerate from I think 1 fps up to 120fps.
The video that I am playing is 24 fps and I am not moving the mouse at all. So Ventura has no reason to update the display 120 times a second all the time without dropping the fps, which it obviously does in my case very unnecessarily. This probably causes the 12 watts consumption.
So I turned off ProMotion in the display settings and set it to 60fps.
After that the battery consumption with only Safari open, playing one video with 24 fps went down to about 6 watts again.
So to me this seems like a bug in Ventura. I will keep investigating that.
Greetings Janni