Q100072: Nuke script is unresponsive or slow

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SUMMARY

This article provides guidance on what to do if a Nuke script has become very heavy and slow to navigate.

MORE INFORMATION

If a script has become slow or unresponsive then we would recommend you do the following to either try and diagnose the causes of the slowness, or try to improve the current performance:
 
 
TROUBLESHOOTING

Test the script in safe mode
This helps you see if the issue might be related to a customization/third party plug-in you're using or Nuke itself.  More information: Q100038: Launching Nuke/NukeX/NukeStudio in safe mode

Test with Script Profiling enabled 
This helps you see the total processing time spent on each node and identify a potential culprit. The processing time spent on each node is shown as: Red = slow nodes, Green = fast nodes
 
To launch Nuke with script profiling enabled you need to add the -P argument when launching from the terminal/command prompt:
 
Windows:     C:\Program Files\Nuke9.0v8\Nuke9.0.exe -P
OSX:              /Applications/Nuke9.0v8/Nuke9.0v8.app/Contents/MacOS/Nuke9.0v8 -P
Linux:           /usr/local/Nuke9.0v8/Nuke9.0 -P
 
Any nodes that appear red we would recommend you first try disabling to see if the script speeds up and then gradually enabling again with lower settings.
 
For more information please reference our online documentation regarding script profiling.

 
IMPROVING PERFORMANCE
 
Disabling thumbnails or setting static frames
This will help reduce the amount of processing happening within the script.

More information: Q100036: Improve script performance by disabling thumbnails or setting them to static frames in Nuke

Use Precomp nodes
Using the Precomp node you can save a subset of the node tree as a separate .nk script, render the output of this saved script, and read the rendered output back into the main comp as a single image input.

This speeds up render time, as Nuke only has to process the single image input instead of all the nodes that were used to create it. 
 
For more information please reference our online documentation regarding the Precomp node.


Keywords:
Nuke, NukeX, unresponsive, slow, hang, hanging, safe mode, script profiling, precomp, thumbnails, static frames


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