I don’t know if this is the right place to ask, but I was wondering if graphx.c defaults to 4bpp mode or something else.

GraphX uses 8bpp.

Is there any way to make it use 4bpp to improve performance?

Only with custom graphics routines as GraphX doesn't use 4bpp, though the modification for existing routines is not drastic.

I have a suggestion for an inclusion to the "Getting Started" section of the documentation, and I'm not sure where else to post it~

I recently got a new laptop and was installing the toolchain again on a fresh windows 11 install, and I was getting compiler errors, the solution was to download the most recent microsoft Visual C++ redistributable.

I recognized the problem from similar things I have dealt with in the past, but I can see a large potential for confusion for new people as googling the errors gives like 8 million confusing results.

My suggestion is adding a line that says something like "Note: If you get this error, you might need to install this microsoft thing from here [hyperlink]"

This is already in the "Getting Started" page guide. I dunno, maybe read it again? You may have missed it.