uiwebview实时字节不断上升？

I have a RSS feed reader app that I'm running through profiler, and I'm noticing that whenever I load a uiwebview and pop it from my navigation controller, my Live Bytes goes up by a small amount (.10-.40MB). I'd expect Live Bytes to stay where it was at before the uiwebview was launched. Does this indicate that I'm leaking something or is this normal for uiwebview objects?I have a RSS feed reader app that I'm running t