I don't know if anyone has had this issue before (looked in the forum and found nothing about it).
When I select a track on which I loaded a M4L device, my framerate decreases of about 10-15 fps. It's like looking at the interface demands a lot to GPU or CPU.
As you could see, my M4L device doesn't have much visual in it...
(the 3 outputs are 3 bpatchers)