Does the Tablet z really support HD playback

Vudu recently updated its app to HD and HDX playback on Tablets running Lollipop or higher..
My google plus movies will download in HD I think...I get no error when downloading movies with settings set at HD or better.. but Vudu states my tablet is not compatible and reverts to SD. even though I have lollipop 5.1.1 ..
Does this tablet truly support HD playback whether it be google or Vudu?
My google plus movie files average 1.2 to 1.5 Gig each, so I assume they are HD quality...Just curious...might be a Vudu issue

anyone experience audio lag after inserting headset/headphone during music playback

I've upgraded my nexus 5 to marshmallow 6.0.0_r1, a 2~3 seconds delay could be perceived after plugging headset/headphone
during music playback session, to be more specified, a wav file/ youtube playing leads to this pronounced lag,
it was fine with mp3 files, anyone has the same result ??