Speed of connection

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2

the speed of your network, it depends on the network device, which is usually your router.

Also, Wifi is slower than wired.

I would start there, wired a PC and try it. If it has positive results, wifi might be your issue.

But also, there are a lot of factors involved. Here is some reading:

http://www.tomshardware.com/reviews/gigabit-ethernet-bandwidth,2321-3.html

For Wifi speeds]:

http://www.speedguide.net/faq_in_q.php?qid=374