My frustration reached top. 
People said about RK3288 boards, that stutters depends on the speed of flash memory! What?
I take out of the closet, my old player on Amlogic MX processor.

Results. Is not that interesting? 

AndroBench v4.0TV01II RK3288 HTC (Rockchip)
rom: v1.02 (HPH, mo123 for HTC)
MX2 AML8726-MX (Amlogic)
rom: G-Box MX2 v1.2
Sequential Read57.36 MB/s22.0 MB/s
Sequential Write6.42 MB/s2.46 MB/s
Random Read12.61 MB/s, 3256.62 IOPS4.83 MB/s 1252.25 IOPS
Random Write2.5 MB/s, 650.93 IOPS0.71 MB/s 185.25 IOPS
SQLite Insert80.23 TPS, 12.76 sec13.56 TPS, 75.46 sec
SQLite Update110.73 TPS, 9.24 sec16.35 TPS, 62.62 sec
SQLite Delete105.79 TPS, 9.67 sec45.97 TPS, 22.27 sec
Youtube stuttersYESNO
KODI stuttersYESNO

Amlogic MX is a lot slower than HTC Rokchip, and works much better!
Please do not tell me, that it depends on flash memory.
Why it does not work for the player with Amlogic?

Welcome to the discussion.