Since about 3 years ago our late "21in 2013 iMac has been slowing down a lot and I have checked everything and nothing seems to be wrong. About a week ago I came back from school and went to do some homework on our family mac. For a while, it worked fine, but then it froze for no apparent reason, and after about 10 seconds it unfroze and it did that about every 10 minutes. Also, web pages started to not load and would get stuck on loading and then would give me an error saying the page is no longer responding after 5 minutes. As the days went on the times of the freezing kept increasing and the delay before each freeze decreased. At the time of writing this, our family mac freezes for about 2 minutes and freezes every 30 seconds. Right now I am writing this on an old laptop that I have found because our mac is pretty much unusable from how much it freezes. My mom and I are deciding to take our mac to the apple store to see what's wrong with it and why it keeps freezing. If anyone knows why, please tell me. Any replies will be greatly appreciated, Thank You.