I average 196ms
I think everyone can subtract at least 16ms for display lag (if you're on LCD)
Tip 1
Ok, some observations.. I got it down to 160 with some practice..
Essentially,, Don't look for GREEN.. wait for (flash).. As soon as you feel the screen is "brighter",
Click..
It's a much faster response..
My guess is.. If you're waiting for GREEN you'd still have to process the concept of GREEN, which is more complex than simply an increase in brightness..
Another Tip
Double click.. Do not single click..
If you single click, you need a second click to start the rhythm again..
If you double click, the timing and process is more streamline and simpler..