I have moved your post.
The multiboot function is off by default. The image will be flashed onto the internal flash memory.
Speed is subjective as people have different plugins/options etc. Best to try it and see for yourself.
PLi is fastest booting image in my experience. But they tend not to have features installed or part of image that other teams have. There are no official PLI images for your box, but there are homebuild versions available.
