Hello Iris,
What hardware are you running on the network? Is it wired pr wireless? The reason why i ask is because the network will only be as fast as your slowest connection. With wireless standards there are different grades or speeds, 802.11 b, a, g, n, or ac. Each of these goes from slowest speeds to fastest.
Your router plays a massive role in the top speed of the network also.
I do not work for UIA, I just have done a lot of research on the subject. Also having a degree in network security helps also.