Show Menu - the list always beachballs

I'm a longtime user but not very advanced. I just discovered the "Show Menu" action and find it much nicer than my previous approaches.

But, every time (every time), I set the Menu Title and Menu Item from action's menu, each app list causes a beach ball for 3 to 10 seconds... I sometimes need to make several attempts to set the value. For clarity, see the attached image.

I have a 2017 iMac with plenty of RAM (unused). If this is a bug, please tell me where/how to submit it.

That is very strange. I have never observed that behavior.
Running Keyboard Maestro 9.0.2 on macOS 10.14.6 (Mojave), it shows the menus very fast, as you can see in this animated GIF:

Show-Menu-Mail-Setup-KM9%20(1)

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What versions of KM and macOS are you running?
Have you tried this after a restart of the:

  • KM Editor?
  • KM Engine?
  • or Mac?

I'm up-to-date like you - KM 9.0.2, macOS 10.14.6. I've been noticing this issues for a few weeks (since I discovered this action) on my iMac. I have restarted these over that time, but will explicitly restart the iMac and these processes and see what happens.

edit: my 2015 MacBook Air doesn't have the issue that my 2017 iMac with 64GB of RAM has... is the Fusion Drive to blame, I wonder...