ID 519431 - Panning on the Nuke Studio timeline can cause playback fps to fluctuate

Problem summary
Panning on the Nuke Studio timeline can cause playback fps to fluctuate.
 
Customer reported version
N/A
 
Customer reported platform
Linux
 
Steps to reproduce
 
1) Open Hiero.
 
2) Open a large Nuke Studio project. The issue seems to be easier to reproduce in a sequence with lots of track items on multiple tracks.
An example .hrox project is also attached.
 
3) Press play in the Viewer. Nuke Studio should play back cached frames in realtime.
 
4) Click the middle-mouse button and drag to pan around the timeline:
 

 
Expected behaviour
Panning or navigating around the timeline should not affect playback fps in the Viewer.
 
Actual behaviour
Panning on the Nuke Studio timeline can cause playback fps to fluctuate.
 
Workaround
Unknown.
 
Reproduced by support
This bug has been reproduced in:
Nuke Studio 13.2v4 - Windows 10 - Linux CentOS 7
Nuke Studio 12.0v1 - Windows 10 - Linux CentOS 7
Nuke Studio 9.0v1 - Windows 10
 
Earliest version tested
Nuke Studio 9.0v1
- This issue appears to be in all tested versions of the product