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This article describes performance improvements for the Web Services Security (WS-Security) specification. In the course of its development and performance measurement, we identified bottlenecks in the XML parsing and public key operations such as RSA signature and encryption. We are working on minimizing the impact of both of these bottlenecks. We implemented a stream-based WS-Security processor and showed its efficiency in XML parsing, in terms of both the processing time and the memory usage. In addition, we introduced the Web Services Secure Conversation (WS-SecureConversation) to avoid expensive public key operations.

This paper presents the experiments of collecting the documents on the WWW using distributed WWW robots. We propose distributed WWW robots to collect the documents quickly. Our final goal is to collect all of the documents on the WWW in Japan within one day. Currently, eight distributed WWW Robots are running in Japan.The experimental results show that we are able to gain 5.8 to 9.7 times speedup when four distributed WWW robots are placed at different places in comparison with when only one WWW robot is used.