Fast enough for my light use -- internet browsing, music and movie streaming, social media.  That is if the wifi connectiom doesn't drop.  There's a wifi card inside but there's no external antenna.  Superb customer service, fast response, friendly and professional in communicating.  Unfortunately for me,  they had no antenna when I called, but promised to ship one to me when they have.  At the moment, I am switching an old USB wi-fi dongle between this Lenovo and an ancient laptop.  USB wifi is slow but more reliable than the one that comes with Lenovo with no antenna.  Nonetheless, both seller and this machine are recommended.