and, conversely, just because it's there doesn't mean i notice it.
am really good on my SE with ios11 (with 'reduce motion' on). i spend (sadly) more time on these forums then i do counting possible half-second delays on my phone..
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am on an SE, and not experiencing anything like that. try turning 'reduce motion' on (just to try it). reboot? reinstall the OS? call apple? i see no difference with my home button between ios 10 and ios 11. so something may be up specifically with your phone...