Hi Michael,
I understand what you are saying and you are right of course, so it could be something specific to my setup.

Still, please try the latest version of the CVolume2 script from Max's site with the attached test file.
On my computer (Macbook pro 15 2015 16GB, running Mojave and MoI v4 beta Oct-17-2018) i get consistently around 2 sec of calculation when i type <TAB>_CVolume2 and around 5 sec when i use a shortcut.
I dont think caching is involved as i get the same results if i launch the script 2 or 3 times in a row using the same launching method.

I have this issue only with this script as i get the same running times if i use my original version of the volume script.
Unfortunately i dont use any other scripts that take a noticeable time to finish so i can't verify this with anything else.

Dinos