hstorm101

Hi guys, I'm hoping you can help me diagnose my car's problem.
My 2006 tC has ~40k miles on it. In the last month or so, when I start the car engine up, it takes a few more "cranks or turns"(I don't know the term) to get the engine going. So it just feels a second or 2 longer than normal to start up. But the car always starts up, there has never been a time when it just didnt. And it isn't an excessively long time that it takes, just literally an extra second or so but I just know its not how it used to be.
This happens when the weather is warm or hot. My battery was replaced a year ago.
Somebody has mentioned it maybe being the spark plugs, but what do you guys think? Thanks!