@mark Thank you for your reply, Mark,
Here's my setup:
MacPro 5,1
12 core, 128 GB ram
OS 10.13.6
GPU: nVidia Geforce GTX Titan X
Webcam: Microsoft LiveCam Studio HD USB cam. Has worked very well as a live video source in Isadora 2.6.1
I'm measuring CPU usage with iStat Menus, screen shots included.
I should mention that I forgot a detail regarding Live Capture in 3.2.6 on my system: with a new file, when I first click "Start Live Capture" in the settings window, the webcam image *does not* appear in either the Preview or Channel 1 mini preview at the bottom of the Live Capture Settings window. The audio connection shows up in the Channel 1 mini preview, but no video. And the CPU usage does not go up at all. Only after toggling "Force JPEG Capture" a couple times will the video capture start and then of course CPU load goes up. This has never happened in previous versions.
And related, when I leave "Force JPEG Capture" on, the CPU usage goes down significantly to somewhere around 160%. Turning "Force JPEG Capture" off again shoots the CPU usage back up to at least 600%.
"Force JPEG Capture" appears to have the opposite effect in Isadora 2.6.1: with "Force JPEG Capture" off, CPU usage sits around 90-100%. When "Force JPEG Capture" is turned on, CPU usage just about doubles to around 200%.
Thank you again for your assistance!