[General Maximus]

dear dear dear. You need to change your security settings to WPA2 Personal with AES. It isn't going to improve your throughput but it will defo make your connection more secure. It doesnt matter how many user accounts you have on your pc. The only time it would make a difference is if multiple users were logged on simultaneously with enough apps and proccesses running that it would impact the performance of your pc. Unless you have got an super sweet NIC, your cpu is still going to look after your networking stuff.