Hello! I'm a bit of a tool novice, bought a 'skil' circular saw a couple months ago to cut fence panels etc. It worked great at first but now it is cutting very slowly and I find I have to push it to get through (which I understand you are not supposed to do generally). Could the blade be dull already? It is a corded model so it's not a battery problem. I accidentally cut into some rubbery material with it once (long story) could this have damaged or gummed-up the blade somehow? I think I have the blade tightened correctly because I don't get any problems with slipping, etc but maybe I'm wrong about this. One more thing, I bought a very small tooth blade for it because I hear they make 'neater' cuts (less splintering), do these wear out easier? I know the smaller teeth will cut slower in general but it was much faster when I first used the blade than it is now. Advice greatly appreciated!