Wal-Mart's international performance further underscores the trend of U.S. firms benefiting from the weakened dollar, as well as becoming increasingly dependent on their international business to provide growth while domestic performance sags.

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He also said that the company is benefiting from strong cyclical trends in Web security, site performance, mobile site performance and delivery of high quality video.

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Some of the performance figures are subdued by comparison with the start of last year as Aggreko is not benefiting from the one-off gains from the Vancouver Winter Olympics, the build-up to the FIFA World Cup in South Africa and the Asian Games.

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