Why does my Favorite Browser slow to a Crawl?

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Among all popular browsers, Google Chrome is my favorite one. According to what I know, Google Chrome is more lightweight than Mozilla Firefox and it is more atable than internet Explorer. At the same time, it is almost the fastest one browser. But now, it seems to slow down and I can't figure out why. Yes, it slow to a crawl, which is really difficult to understand. Any suggestions and tips would be greatly appreciated. Thank you. O(n_n)O