While the page they link to uses "lagging", "lacking" actually seems to fit better with the context it's used in there: The paragraph it's used in ("Why is PYP

While the page they link to uses "lagging", "lacking" actually seems to fit better with the context it's used in there: The paragraph it's used in ("Why is PYPL so different from TIOBE ?") seems to argue that TIOBE is lacking, not lagging.