All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=665819

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs4CN8QsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs9Dd6AgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs4bOqwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg86CbrQkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs67fvgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg04fL8ggM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs-OJ8wgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs_rGuAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs_XwvAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg88CetwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs5SGqAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs5ScsQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0_vZ8AoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg04fVowsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgk86WgwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg06in9gkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg07Kf9AgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs5HEugkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0-edpgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs8SevwsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg04fLsgkM


Bot(s) for this bug's original alert(s):

webrtc-mac-large-tests

Great, cool to see. I suppose using a higher deployment target allows the system frameworks to use features only available on those platforms, increasing performance.