Hi thank for you answer, the stuttering is really light on my tv (LG 32" full hd), but it really exist :). On pc screen (samsung 22") instead is heavy and force me to seach a solution.
In this forum i have found a very old threed (about amiga configuration, really hard to find here). I have write into recalbox.conf "amiga600.videomode=CEA 19 hdmi" to force a 50 hz 720p, but it doesn't seem work. why? Is correct this procedure? or is my mistake.
This problem is heavily documented within the amiga emulation and it seems to me very strange that it is not supported here. I will wait for future developments to see if anything changes in recalbox.