So I picked up a PS TV for next to nothing today.
Tried to remote play my PS4 with it - can't believe how laggy it is especially on a wired connection!?!
Even my Z3 remote play feature was better than this and that is wireless!!
Anything I can do to improve it?
Do you have both the PS TV and the PS4 wired? There's a Framerate option which you can set to high so you should then be streaming at 720 / 60 fps. If that doesn't help I don't think this is much else you can try.