I'm using the LibreELEC on Asus Tinkerboard & performance is really good. Rockchip perhaps fare better compared to Broadcom. I have an AV receiver, so I'm getting the decoding done by the AV receiver, not because the Tinkerboard is bad at it (it's actually very good), but I'm doing it to reduce CPU cycles on audio decoding & have the CPU spent it's energy on Video only. When I did use the onboard decoder Asus did not break a sweat & did a great job of it, but the CPU tended to get a trifle warmer.