What is the problem related to Multidex in Flutter?

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Multidex is not a problem in Flutter specifically, but it is a problem that can occur when building a large Android app in any language. Multidex is a way of getting around the 65K method count limitation of Android apps. If an app has too many methods, it won't fit into the default Dalvik executable format, and an error will occur.

The problem with multidex is that it can slow down the startup time of the app, as the system has to load multiple Dex files instead of just one. Additionally, multidex can cause issues with libraries that rely on reflection, since the methods and classes are split across multiple Dex files, it is not always possible to find them.

To avoid potential problems with Multidex, it is important to ensure that the app is optimized and the number of methods is kept to a minimum. Additionally, it is important to test the app thoroughly on different devices to ensure that performance is not negatively impacted by Multidex.