I was wondering if there has been much testing into Aero creating large amounts of input lag. A simple way to test is to have aero enabled and do a basic reaction time test
and then repeat the test after disabling aero (system properties > advanced > performance > settings > "best performance"). Comparing results, Aero has added an additional ~50m/s of input lag.
Another curiosity is that having basically any single Aero feature enabled will result in the full amount of input lag. Is this a well known/documented problem?
(your mileage may vary depending on how consistent you are with reaction tests)