Tanner Roark averaged 110 pitches per game in May and had a 3.18 ERA for the month, then in June his ERA was over 6.
All of Gio's last 4 starts in May were over 110 pitches with a 1.47 ERA for the month, then in June his ERA was 8.44
Strasburg averaged 107 pitches per game in May and ended up on the DL in June.
Max's have been even higher May and June, and he seems to be built to handle it better. But his 3 starts show a little reason to worry. He's got the job done, but 16 Ks and 8 BBs over 3 games is not very Max like.
I haven't really looked how that has compared to season's past, but I do remember a stat flashing up around May showing most of our starters leading the MLB in pitches thrown. May seemed too early for pitch counts like that, and it seems we are feeling those results now.