Resolved Photos slideshow export to 1080p .mk4 loses CPU + GPU usage while in window hide mode?!

[m4v3r1ck]

Newbie Photos user!

I'm exporting slideshows to 1080p (.mk4) files in Photos App. When I hide the window, the app losses the use of both the CPU and the GTX-670 (PC):

Photos window on screen:

When Photos window is hidden to the dock:

Photos window back on screen:

Anyone an idea what causes this? Any direction appreciated.

Cheers

 

[!!!]

What are you using to monitor your GPU? I've been looking for a way to monitor my GPU.

 

[m4v3r1ck]

What are you using to monitor your GPU? I've been looking for a way to monitor my GPU.

Istat Menus!

Main screen:

Beause I don't like to clutter my menu bar I use the combined mode to monitor all in one glance!

There may be others apps around, but i'm happy with it!

Cheers

BTW: Any suggestion in answer to my question?