HW transcoding - remote problem

Hi!
When I activate HW transcoding on one of my Plex servers, a lot of buffering happens when I try to watch Plex at work (offshore rig).
When HW encoding is turned off, this is not a problem.

When I use the same client to play a movie in my local network, there is no problem when HW-transcoding is activated.

Just wondering if anyone know why this is happening?

I have a Geforce 1080GTX graphic card.