Hi,
Welcome to the forum,
The stuttering will be fixed in our next major kernel update, which is due shortly.
We’re still working on some macroblocking issues which occur with some titles such as Gravity. This isn’t something we can fix directly as the issue appears to be with the MVC microcode, so we have started a conversation with the SoC vendor to investigate the issue thoroughly and we are working on given them reproduction steps.
Sam