ID 488586 - Nuke 13 is much slower to render BlinkScript nodes on the CPU than Nuke 12 releases

Problem summary
Nuke 13 is much slower to render BlinkScript nodes on the CPU than Nuke 12 releases.

In Nuke 13.0 versions, the GPU performance is consistent with 12.2 and 12.1, however, CPU performance is now much worse.

Customer reported version
N/A

Customer reported platform
CentOS 7

Steps to reproduce


1) Download the attach .nk script

2) Execute the script via the terminal, like so:

nuke -F 1,5 -x Blink_Index_test.nk

3) Repeat this in Nuke 12.2 and observe the difference in render times.

Expected behaviour
The time to render BlinkScript nodes on the CPU should be the similar to, or better than, Nuke 12 versions. 

Actual behaviour
It is also significantly slower on the CPU in Nuke 13.0, compared to Nuke 12 releases.

Workaround
Unknown. 

Reproduced by support
This bug has been reproduced in:
Nuke 13.0v4 - Linux CentOS 7 - Windows 10
Nuke 13.0v1 - Linux CentOS 7 - Windows 10 - Regression

Unable to reproduce bug in:
Nuke 12.2v9 - Linux CentOS 7 - Windows 10

Earliest version tested
Nuke 12.2v9
- This issue doesn't appear in this version and has regressed