I tested the Dev Build posted by fritsch on my Bedroom Intel 2820 NUC and 50fps Playback produces a lot of missed Frames. On my Livingroom Chromebox Celeron everything is fine...
ASRock Beebox J3160 4GB RAM 120GB SATA SSD - Harmony Elite BT
Intel NUC Kit DN2820FYKH 4GB RAM 120GB SATA SSD - Harmony Smart Control BT
all @ Libreelec Testbuild
HP N54L @ Ubuntu 14.04.4 Minimal Server / MySQL DB
HP N40L @ Ubuntu 14.04.4 Minimal Server