What does sport mode really do

[ALOVERR69]

Hey guy's i have a question about sport mode i have the 2005 3.0i sports package.My question is what does the sport mode really do does it change gear ratio does it use only certain gears.When i do use it i notice a difference. But i notice the other day while doing 80MPH. Not that thats safe just was testing sport mode the car was struggeling to jump on to the next gear is that normal.It felt like it had more to offer but the rev was way up there.

p.s. I know most are going to say 80 im already or the car should be on its last gear but it felt like it was struggling it definatley had more to offer.when i shifted back to its regualr mood the car took the next gear