So my computer keeps freezing whenever I am opening a application that uses the hard drive extensively (like Mail or Utorrent) or when I am opening a large file (e.g. a movie). I checked activity monitor and the CPU and RAM are completely fine, but as soon as the mac starts to freeze the Read speed on the Hard Drive goes 100+ MB/s. Now I am pretty sure my mac can't read that fast. How do I solve this problem?