Samsung Galaxy S II :: Slow To Return To Home Page?

i've had my S2 for about a month now and have noticed over the last week , how slow it is to return to the home page. This is returning from anything whether that be from an application or messaging or just going into the settings. I've timed it today and it takes 7 seconds to return. It doesnt matter whether i use the home button or use the back button , it still takes ages. When moving between other screens, the phone is its normal fast speed its just when it returns back to the home page.