I can see in the process monitor that the CPU is NOT on a heavy load.
This has been for at least 2-3 years and I initially suspected some of my many installed plugins.
I disabled all of them but still the same momentarily freeze happening. The freezes are short, like 1-2 seconds at a time.
After some intense digging I realized that the freezes ALWAYS happened just before the Indigo log displayed a Z-Wave update!
So when I was clicking around with the mouse and the selected row I clicked on did not get highlighted I saw a Z-Wave event in the log shortly after (1-2 seconds).
This happens ONLY within the Indigo UI and if I click around in any other program while Z-Wave events are arriving in the Indigo log there are NO freezes.
I have the Aeon Labs Gen5/S5 USB Z-Wave stick and debug info shows this:
Z-Wave connected to Z-Stick interface on /dev/cu.usbmodem641 (firmware 1.01)
Z-Wave Debug starting serial connection loop
Z-Wave Debug starting zwave packet parser thread
Z-Wave Debug SENT getVersion: 01 03 00 15 E9
Z-Wave Debug RCVD getVersion: 01 10 01 15 5A 2D 57 61 76 65 20 34 2E 35 34 00 01 93 (no inbound callback)
Z-Wave Debug . . getVersion: Z-Wave 4.54 static controller