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Performance and usability are critical to successful mobile apps; this webinar shows you how to improve both when creating a location-based application for Series 40 phones. The webinar discusses techniques and architectural choices you can use to minimise the latency of your application when combining the Nokia Maps API for Java ME with other web services. Understand the correct use of the API, and the pitfalls to avoid, through the discussion of real world examples of web services providing KML and JSON feeds. An in-depth discussion of how to increase the complexity of information displayed without compromising usability by using custom overlays is also included.