Link: https://gigperformer.com/questions-about-rackspaces-and-variations/
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Other useful posts:
[1] You could have thousands of rackspaces - LINK
[2] Creating rackspaces along with Rig Manager aliases without a MIDI controller attached - LINK
[3] How to use GPScript to set explicit widget values in different variations - LINK
[4] A plugin in a non active rackspace might consume a certain amount of RAM but shouldn’t use much CPU power. Same as a bypassed plugin - LINK
[5] Is it better to use variations or rackspaces for your patch? → Solid tip to help you decide - LINK
[6] Putting the same plugin in multiple rackspaces does not significantly increase physical RAM because the DLLs are shared – only the instance data is duplicated. - Mute vs. BlockNoteOn for CPU Usage - #8 by dhj