What's the most efficient way to add an image, memory and compiling time wise?

I’m new to Typst and I’ve been reading about the new changes in 0.13 version.
My question is: I want to add an image in the header so it will show in every page using our template. What would be the most efficient way to add this image, memory and compiling time wise? I ask that because bytes could be an option to store the same data in one memory place, if I’m not wrong, but then how to write the right lines?