Google is not responding all of a sudden-- Why..?

[CHarris]

It depends on whether or not other websites are loading. If your internet slows down, at worst, you could be under a DDoS or DOS attack. (Denial of service) however this would slow your whole connection down. Make sure you're connected to the right wifi and everything is good. Check cables, plugs everything then try forgetting the network or pressing the "Reset" button on the router (Usually requires a pen or something pointy)