You may have gotten some good links in the past, but don’t count on them helping you forever. Old links go stale in the eyes of Google
Google has posted a short but interesting video to its Webmaster Central YouTube channel . A user asked the question, "How many bots/spiders does Google currently have crawling the web?" and Google’s Matt Cutts gave his answer. "It’s important to realize that it’s not really actual robots or actual spiders out there…instead, it’s banks of machines …at Google’s data centers who open up an HTTP connection and request a page and then get it back," he says
Late last year, in a conversation about the Caffeine update , Google’s Matt Cutts told WebProNews that page speed could become a factor Google looks at for ranking search results. His comments received a lot of attention , because Google has never taken this into consideration for ranking websites in the past