Does a router affect broadband speed?

[Naruto]

OK so I just set up a new netgear router in my home and now I have wireless internet in my home.I use the wireless internet to acces internet on a tablet via wifi.Recently I have noted that my internets speed on my pc has decreased.I use an ethernet cable to connect to the internet from my pc and the cable goes through the router.I have checked my download speed from various websites and it is 1mb which is what my ISP has given me but the time it takes to open a webpage has increased.Is this caused by the router or is this a problem of my internet only??????P.S I dont know if this is imprtant but I have only 31 GB free on my hard drive.PLease tell me what I should do to improve the speed.