IPhone 5s takes forever to load some websites. Slow Wi-Fi?

It really wasn't like this when I first got it. I don't really know if it is because I upgraded to iOS 8. But when I go to safari and visit a website, it takes at least 10 seconds for the website to show up. For google, it works fine, but for some other websites, it takes forever. It just takes long to load up pages. What's the problem?

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