Hey, since kodi v21 final, i have discovered that when i start a 4k remux movie via smb, sometimes i see the buffering circle or mini stuttering in the first seconds. After the movie running without problems.
In kodi v21 beta 2, i have not see this effect.
I use a Shield Pro 2019 via 1 gbit LAN, my smb content is on a windows system.
My cache settings in kodi are default.