It seems the gremlins were simply taking a long lunch.
The performance between 3:30 pm and now (US, central time) has been *horrible*. Any response taking 30 seconds to a minute or longer.
I also just got this error in an orange banner near the bottom of the screen:
"The content you requested could not be displayed due to an error..."
Got an error during the first post attempt, trying again... (An error occurred while trying to submit your post. Please try again.)
Then got a forced logoff, then got "An internal error has occurred".
Sheesh, what's going on?