A mess.
Actually it's only behaved like a mess,
because I can't get my head around setting up a proper IK rig.
I've rebuilt the rig twice, and now have a very simple skeleton with 40 bones,
including a few for IK. The first rig was an automated job, which looks good and works fine,
but it's way too complex for me at this point.
So I decided to build it myself, and it seemed okay until suddenly Blender started crawling.
I thought maybe I set up the bones wrong, so I did it over again...same result.
Then went back to the plugin...same result.
Finally discovered that the plugin rig, even though it was deleted,
left some vertex groups in the file that were in conflict with the new rig.
So now I'm on the third rig, and still have to tweak the weight maps before animating.
And have to learn more about IK chains.
