What are some situations where I would want to change the Response Time setting from Normal 8 ms to Fast 6 ms? What are some good tests for me to see the difference? I can't tell much difference by quickly dragging a windows around the desktop.

Some reviews of this monitor just say Normal is fine. The Fast response time has some overshoot which shows up at ghost edges but I can't see that. I do play some games but not much first person shooter. Is it input lag in FPS that fast overshoot helps?

This monitor is not a gaming monitor so why does it have the option of Normal or Fast? How can I test it?