Description: In the paper we present results of practical performance measurement of the .Net web services deployed in Microsoft Azure Cloud Computing environment. In our experiments we used the measurement techniques allowing to distinguish between characteristics of a web service and delays induced by the Internet which is used as a communication media. Obtained results shows that web services deployed in Clouds and invoked over the Internet are characterized by significant uncertainty of a response time. It is shown, that the web service implementation frameworks and deployment options significantly affect its performance.
Keywords: Cloud Computing, web-services, performance