If you are experiencing of slow downloading speed of your LAN, then try this may be this works for you. Just follow given steps to get maximum LAN speed:
1). Open Control Manager.
2). Double click on Device Manager.
3). Now window will asked for your permission to continue, just click on continue.
4). In device manager window locate network card & double click on it.
5). It will open new window, Here click on Advanced tab.
6). Now locate speed and duplex in property and then on right hand side select 100mbps half duplex.
7). Click OK.
Now your LAN download speed must be faster than before, Its the maximum LAN download speed.