Most people eventually notice that their computers start to slow down as time goes by. Although this process normally happens gradually, you may not realize it at first until it is apparent enough. Odds are your Mac is going to start slowing down at some point or other, but the good news is that there are steps that you can take to increase its speed. If you want to speed up Mac and restore its performance levels, here are a few things that you should try: Clean out ‘junk’ and unnecessary files from your hard drive. If your hard drive…