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Most new laptops are configured to automatically reduce power output to the wireless card when running from battery.  This is great if you’re wanting to extend battery life, but it slows down your wireless connection.
The steps below will show you how to maximize wireless performance by disabling this feature:

Most wireless routers, when using default settings, are designed to provide wireless access for anyone who requests it.   Have you secured your wireless network?   If not, you could have bigger problems than the occasional freeloader. Someone with ill intent could also obtain passwords, credit card numbers, your private photos, and other personal information if not properly secured. 
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The location of your router has a big impact on wireless performance.  A good location is one which reduces the distance between client and router, and also minimizes signal interference and obstructions.  
When deciding where to position your wireless router, consider the following:

Router needs to be as close to the center of your coverage area as possible.