Once my friend’s machine to feel his machine reaction speed particularly fast, I wonder my friend machine is not bought near it, but after I know I don’t believe the moment for such a long time, how could the machine response speed so fast. I later learned that his machine to install threat defense, because it is so installed this threat defense will be the reaction of his machine is fast, so I went directly to his machine installation of the threat defense, but now my machine was much faster than before it, if I don’t others say their machine is long before buying, they would think my machine is recently purchased.