You may remember I said in the 3.0 update topic that I had terrible stuttering issues since I upgraded. Well since the Shield TV was basically unusable anyway I decided to do a full blown factory reset, and guess what? It basically fixed all my issues.
In fact this is now by far the best my Shield TV has ever worked. I always had some slight judder even when I forced it to 23.976 hz, and now it's all perfectly smooth.
So I guess this was an issue since day 1 for me, that got even worse with the 3.0 upgrade. So if you have any such issues, give this a try :)
Even Netflix is now usable without switching to 23.976 first, there is some judder of course, but it's completely watchable without any of the slight pauses I had before. HBO Now is still bad though.
Pretty much Android 101 really. When moving from version to version, especially big updates, its best to do a factory reset for a clean install.