Although WIFI is great for not having to be tied to a cable, it's poor for signal strength. A signal travels far better through a cable than it does through the air. Any number of reasons it's weak. House wiring, appliances, ductwork plumbing etc can have a negative effect on wifi. You'll see the farther you get from your wifi router, the worse your speed will be. Another common mistake is placing the wifi router/modem in the basement and then expecting good results on the main floor. Another issue is older laptops with network cards that are only good for 54mbps. If you're going to use wifi, your best bet is to place the wifi modem/router to where you spend most of your time online. In your case, you might try changing the channel on your wifi that is less crowded.
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