Im reading into cpu usage and read this in some documentation
"Use HDMI as composite requires more CPU usage."
Does that mean that using the audio over the HDMI is going to use the CPU less or more?
The article you linked to has the following statement:
Notes on Audio
Use HDMI as composite requires more CPU usage.
This statement is nonsense and doesn't make sense. It's possible that they're trying to say that using a 3.5mm to 3xRCA output requires more CPU than using the HDMI port, but I can't find any real data to back up the claim.
Thinking about the issue, the graphics output should be handled by the GPU, so I don't know why this would be true. This seems to be a case where the documentation just sucks. Sorry.