According to Official Guinness Records,
The fastest espresso machine is the 'Swiss Espresso Extractor', designed and built by A. Schurr, J. Lüönd, A. Lütold (all Switzerland) and SK tec SA. It produced 11.5 litres (3 US gal) of espresso coffee in one minute on 26 September 2008.
For a complete list of 2008 records, please visit 2008 Guinness Records in Switzerland.