We have an application that is currently making use of your Flex framework. The application have 2 graphs, a nornal chart and a pie chart. We are trying to validate, what would be the peak number of concurent user for a server with dual CPU and 4G of memory. What are you the usual recomendation for peak performance.
That depends on your server, not Flex. Flex runs on the client computer, not the server. It all depends on the speed of your server, the server code and the data required for the graphs and how often the data is refreshed from the server.