Completely normal, get used to it, it's a Lexus. It's their way of making the acceleration slower, to save gas. They use electricity to control the response from the pedal to the engine instead of hydraulics so it's really slow and can be frustrating at times when u need acceleration. There are only two ways to solve this problem - Use the S mode and change gears manually or Turn on the PWR button. The power botton is right behind the steering wheel on the right, it's a switch right next to the traction control, once you switch it on a green light will come on. It makes the pedal more responsive but can also decrease your fuel economy if you're not careful. I usually use it around town and then switch it off when I'm on the highway and just want to maintain a certain speed. Hope that helps.