Delta Plugin

This is a command-line program that will merge objects from your mod's plugins.
Download the zip of the latest Package release for your operating system, extract the included binary to the suggested folder path shown above. To run it:

• On Windows, navigate to the folder you extracted Delta Plugin into and Shift+Right-click the folder to open the context menu. Click Open Powershell window here and type the following command:

  .\delta_plugin.exe merge --skip Cell --skip Dialogue --skip DialogueInfo .\delta-merged.omwaddon

• On Linux or MacOS, cd to the folder you extracted Delta Plugin into and use the following command:

  ./delta_plugin merge --skip Cell --skip Dialogue --skip DialogueInfo delta-merged.omwaddon

It is very important that you add the --skip Cell --skip Dialogue --skip DialogueInfo arguments after merge! Omitting this will cause problems.

It will read the load order defined in your openmw.cfg file and produce a merged plugin (delta-merged.omwaddon) in the location specified in the command. This delta-merged.omwaddon file should be loaded last.
A merged plugin produced by Delta Plugin will auto-clean all dirty records with the exception of Evil GMSTs.
Note that merging large load orders will require a lot of memory (and/or a large page/swap file), you can reduce memory usage by setting the RAYON_NUM_THREADS=1 environment variable.
Please see this page for more resources on the topic of object merging.
NOTE MO2 users read this: make sure to follow your specific "Mod-Organizer To Openmw" way of handling omwaddon, omwscript, files for this.