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While Web Services Security (WSS) enhances the security of web services, it may also introduce additional performance overheads to standard web services due to additional CPU processing and larger message sizes. In this paper, we present a simple performance model for WSS. Based on the observations of WSS performance in our previous work, we extend a web service performance model by modelling WSS extra security operations and increased messages sizes into the existing model. As fitting the parameters on one testing environment, we validate our performance model on another different environment with different messages sizes and WSS security policies. Our testing results show that our performance model is valid and can be used to predicate the performance of web services with a variety of WSS configurations.