If you don't notice the UI being unresponsive on an ICS stock phone, no. (As an aside, the only good phone/tablet I've tried on ICS that has responsiveness issu

If you don't notice the UI being unresponsive on an ICS stock phone, no. (As an aside, the only good phone/tablet I've tried on ICS that has responsiveness issues is the Galaxy Nexus. Anecdotal, but still.)