I live in an area that has no cable service, therefore, my internet service is too slow for regular downloads. In order for my ROKU to work, I needed to upgrade my internet service which increased my payment another $70.00. If I change my wifi to a better one that accomodates ROKU, will it work better, or will it stay the same. My question is, will the wifi be enough without upgrading my internet service, or will I have to upgrade? Thanks.