I'm currently developing a 3d runner for Android and iPhone and just recently got my iphone license. I've been testing the game so far on my Android device and it runs fine, however now testing on iPhone for the first time the game seems to lag roughly every 1 second at a constant interval. It's only a fraction of a second but its really noticeable, and this is an iPhone 4s so really shouldn't be having any processing difficulties. After the game has been played for a while, the lag stops and the game runs seems to run fine from then on.

• None of my scripts only run once every second, or any consistant interval that could be triggering this
• I have multiple animations on the character, and the scene is decorated, however all models are very low poly, and there is always less than ~1500 polys on screen at a time
• All texture resolutions are 256x256 or less
• The level is loaded in small intervals (every 5 seconds), so it's not required to process the entire 3d world at a time

Any ideas as to what it could be or how i could track down what is causing it?

EDIT: keep in mind after running through the scene a few times it will not lag again going through the exact same scene