Michael uses the Safari browser, but it slows to a crawl and the pages time out. Leo says that if he uses a five year old computer, modern sites are going to be a challenge. One thing could be to use a different browser. Michael could download Chrome and see if he has the same problem. If he doesn't, then he'll know the problem is Safari. If the problem persists, then he can look at his connection. Leo also suggests trying an ad blocker to eliminate ads from loading. That'll make it easier. He should also check that Safari is up to date. He may need to update OS X to do that.
The Chatroom says that the DNS could be causing it to slow down.