How do you know? It acts much lazier in the recent summer months for me..
How have you disproved the hypothesis that it recently got dumber and it just happens to be summer?
Clearly, it compared performance to last summer
(Just to be clear, I have no idea what on this thread to take seriously and not and who is. I'm joking at least.)
That won't do it, though, you'd have to observe it being dumber on June 1 and smart again on September 1 for years.