ID 472651 - Performance drops when using a picker sample region with a Deep node upstream in the Viewer.

Problem summary
Performance drops when using a picker region with a Deep node upstream in the Viewer.

Customer reported version
nuke.12.2v3

Customer reported platform
n_a_linux

Steps to reproduce

1) In Nuke, create a Checkerboard node.

2) Add a DeepFromImage node and View it.

3) In the Viewer, create a picker region by pressing Shift+Ctrl+ click/drag the mouse.

4) Continue click/dragging the mouse while holding Shift+Ctrl to view the performance in the Viewer.

Expected behavior
Nuke should create the picker region without a hit to performance.

Actual behavior
The performance drops when using Nuke while a picker region is present in the Viewer with Deep nodes upstream.

This performance drop can also be replicated without Deep nodes when using a large format (4k/8k) and an increased picker region size while moving it in the Viewer.

Workaround
Having the picker region set to a lower size allows the software to continue without performance drops.

Reproduced by Support in:
Nuke 13.0v1 - Windows 10, CentOS 7

Nuke 12.2v1 - Windows 10

Nuke 12.1v1 - Windows 10

Nuke 12.0v1 - Windows 10

Nuke 11.0v1 - Windows 10

Nuke 10.0v1 - Windows 10

Nuke 9.0v1 - Windows 10

Nuke 8.0v1 - Windows 10, CentOS 7

Earliest version tested
Nuke 8.0v1 - This issue appears to be in all versions of the product