ID 418831 - The Export dialog is slow when exporting a script with multiple versions or burn-in applied in Studio/Hiero.

Problem summary
The Export dialog is slow when exporting a script with multiple versions or burn-in applied in Studio/Hiero.

Customer reported version
hiero.12.0v2

Customer reported platform
centos7

Steps to reproduce

1) From Nuke Studio, load the provided script.

2) Set the Clip to relative media.

3) Right-click the clip on the timeline and select Export.

4) Click the shot to edit settings.

5) Attempt to change the Channels, Reformat, and file type options while observing performance.

Expected behavior
The menu should appear fluid and smooth.

Actual behavior
The menu is delayed and appears choppy.

Workaround
There is no workaround available at this time.

Reproduced by Support in

Nuke Studio 12.0v3 - Windows 10, CentOS 7, macOS 10.14

Nuke Studio 12.0v1 - Windows 10 - regression

Unable to reproduce bug in:
Nuke Studio 11.3v6 - Windows 10

Earliest version tested
Nuke Studio 11.3v6 - This issue doesn't appear in this version and has regressed