Is there any app which could throttle the WiFi speed? topic

I am facing this sort of annoying thing lately, you see that I connect my phone to my home's WiFi router, which is basically a wired broadband connection of mere 4 mbps. Now the thing is when I am downloading something on my phone (connected to WiFi) all the data is consumed by the phone and the connection to my PC (which is connected with the same broadband obviously) gets no connection at all. Sometimes I stay in my room and do stuffs on phone and parents come and keep asking me why there's no connection! So I was thinking, that is there any app or something by which I can set a speed limit for WiFi connection on my Note?

Thanks in advance.