I have finally installed Big Sur developer beta.
I couldn't even finished installation process when it first came out a few months ago.
You can find that adventure here:
After installation finished first thing I do is to run my SDLMame. (https://sdlmame.lngn.net)
Then I recorded a video with QuickTime.
Then I edited it with OpenShot video editor. https://www.openshot.org
Then I posted on YouTube with new Safari web browser.
All this worked without any errors and I haven't heard any fan noise.
You can watch the video I have recorded here:
My MacBook Air is very old and its battery is dead.
It can only hold 30 minutes of charge and I was pretty sure that this major operating system update is going to kill this machine.
Also I was thinking that these open source applications would not work at all.
All went well and I'm a bit surprised and happy :)
I'm going to work a little more on this OS and will post updates if anything goes wrong.