My computer just started running slow..

I moved my computer out of one room and into my addition about 130 feet away from where I had it. It ran just fine the room I had it in, now after I moved it it'll freeze on start-ups, very slow loading my browsers and web sites, sometime it'll also freezes opening the web sites, it makes no sense to me. It worked fine for years and never had a problem with it running slow or freezing up. My computer is wifi connected and I am a lot further away from the wifi router now. What would cause this problem to just happen like that after I moved its location, could it be a weak wifi signal at times?