According to Official Guinness Records,
The fastest 50 metres crowd surfing is 1 min 33.29 sec, and was achieved by Shawn Royster (USA) at the Tsonga Center in Lowell, Massachusetts, USA, on 1 July 2016.Shawn made his record-breaking attempt with the help of students attending the Congress of Future Science and Technology Leaders.
For a complete list of 2016 records, please visit 2016 Guinness Records in United States.