MComputer :
So in my house, the wifi is given out through a router and in another room also on the second floor there is a receiver and it gives internet to three desktops. But recently my sister got a laptop and when she surfs the internet is causes me some pretty bad lag when im gaming. BTW in that part of the house there is a really bad wifi signal. I don't how to fix this. I wasn't sure if we had to upgrade our internet or get a better router. Any help will be appreciated. Thanks
Throttle the connection using NetLimiter v3 (free trial) so that no single PC can flood the connection.
If there is no buffering occurring on the routers then your ping will remain quite acceptable and it will complement the QoS that Windows and most routers already perform.
It usually only takes one person streaming HD video on a non-throttled connection to 'wreck havoc' on a home network. Limiting that PC (or laptop) to 70% of what the connection is capable of is likely to resolve the issue without increasing ongoing costs.
Tweaking it so that there is no buffering congestion on the router in the upstream will only help even more.