Lag, Black Bars, Low Fps When Using Wmr In The Editor

Hi There

I have a lenovo WMR headset which works fine outside of Unity but I've noticed it being a bit juddery when playing from within the editor. I have a very beefy laptop (hexa core i7, RTX2070) so I am pretty sure this isn't the issue and games run smoothly.

I notice also that if the game window is not rendering in Unity, that the view in the Lenovo drops to a few FPS only and there are huge black areas when moving my head form side to side - even slowly.

Am I missing a setting or...

Lag, Black Bars, Low Fps When Using Wmr In The Editor