Ethiopia image changes are averaging 15 seconds. A few 5 second. A few 45 second. But mostly 15-ish. Same machine was just doing Libya with 1/2 second changes. Nothing changed at all. Even the complicated Ecuador images (with hundreds of houses visible in frame) were changing in 5 or less seconds.
But, to be a good boy, I shut down everything in the background, rebooted (cold), cleared the cash, brought Ethiopia up, clean ... and ... no change.