Looks like a difference of 11ms, so less than one frame.
This is most likely to be a buggy app (or toolkit) as the message suggests. Please try to identify what the offending app is. For example if the window ID is still 0xa0000e then:
xwininfo -id 0xa0000e
or
xprop -id 0xa0000e | grep _NET_WM_PID
Looks like a difference of 11ms, so less than one frame.
This is most likely to be a buggy app (or toolkit) as the message suggests. Please try to identify what the offending app is. For example if the window ID is still 0xa0000e then:
xwininfo -id 0xa0000e
or
xprop -id 0xa0000e | grep _NET_WM_PID