I can't remember in which forum I've read this, but there is apparently an older firmware version that provide better network performance. P51 or P53 I believe. Is this correct information. For now, either P61 or P70 barely go over 20Gb/s. I personnaly have the feeling we expect too much from a RT chipset which primary purpose is to decode media while we ask it to handle TCP/IP overhead as an extra. When I purchase PBO Core, I intended to use it as a NAS device in addition to its primary Media Library. I must admit I'm disapointed of the file copy performance. Fortenately, with its price tag, at least, Media functions worth it.
At the end, with all the forum I read, I,ve found that PBO Core is "yet another hobby box" where most users seems to play more with firmwares than watching movies.