Why is my Wi-Fi so slow, buy Internet is fast?

So I've been noticing every time I get on my iPhone 5 the Wi-Fi would be so slow and it would take awhile to load pages or it loads then stops and doesn't continue. But when I get on my computer to play minecraft it's really fast and there's no lag whatsoever, maybe sometimes due to the servers but it's not major. Why is this? And is there a way I can fix it? We're suppose to have fast Internet but i don't know. Also, everytime I use my Sony Headset for my ps3 it lags big times and I automatically start loosing connection. It's a real pain in the *** so if anyone can tell me how to fix that'll mean alot.

Perform these simple points given below to increase the Wi-Fi internet speed:-

1) Reinstall the Adapter.
2) Update Wi-Fi Drivers.
3) Optimize Internet Settings(must use reliable program RegInOut for it.)
4) Disable Global Auto-Tuning Feature.
5) Uninstall Remote Differential Compression API Support.
6) Clear DNS.
7) Upgrade your Wi-Fi's Antenna.

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