ID 524506 - Creating a sequence with many Soft Effects applied causes slowness in the Export dialog, when clicking on an export task to open its properties

Problem summary
Creating a sequence with many Soft Effects applied causes slowness in the Export dialog, when clicking on an export task to open its properties.
 

 
Customer reported version
N/A
 
Customer reported platform
Linux
 
Steps to reproduce
 
1) Open Nuke Studio/Hiero.
 
2) Import a clip (File > Import File(s)...).
 
3) Use the Razor tool to the clip into multiple items.
In the attached example project, the sequence contains 54 track items.
 
4) Select all of the track items and add a BurnIn soft effect to them (right click the track item > Soft Effects > Burn-In).
 
5) Right click one of the track items > Export.
 
6) With any of the export presets selected, click on one of the export tasks (for example, Basic Nuke Shot) to bring up its properties. Notice that there will be a delay with the properties appearing.
 
NOTE: The issue can also be reproduced by stacking multiples of any type of soft effect (for example, Grade) on the clips.
 
Expected behaviour
The number of soft effects in a sequence should not impact interactivity in the Export dialog.
 
Actual behaviour
Sequences with many Soft Effects applied can cause slowness in the Export dialog.
 
Workaround
Unknown.
 
Reproduced by support
This bug has been reproduced in:
Nuke Studio 13.2v5 - Linux CentOS 7 - Windows 10 - macOS Big Sur
Nuke Studio 13.2v1 - Linux CentOS 7
Nuke Studio 13.1v5 - Linux CentOS 7
Nuke Studio 13.1v2 - Linux CentOS 7 - Windows 10 - macOS Big Sur
 
Unable to reproduce bug in:
Nuke Studio 13.1v1 - Linux CentOS 7 - Windows 10
 
NOTE: This seems to have regressed on all platforms but the issue now seems to be worse on Linux, compared to Windows and macOS
 
Earliest version tested
Nuke Studio 13.1v1
- This issue doesn't appear in this version and has regressed