Flex performance issues

Question

hi
By using an mvc architecture ,is it possible to overcome Flex performance issues...???
Thanks
Saritha S

Answer 1

Excuse me ? If you develop a large scale application, you had better use a MVC architectural framework (with or without dependency injection) and additional design patterns like the presentation model. Otherwise, you will end up with code complexity as you try to overcome the inevitable structural problems as the application grows and THIS will end up in performance degradation.
-          Run the profiler to identify bottlenecks and memory leaks: number of instances of a given class, execution time of methods, memory usage … E.g item renderers
-          How much data is loaded, processed and displayed at any one time can have a big impact on performance. Reduce the amount of data: paging via parameter to the service
-          Reduce the layout complexity: remove containers so nestLevel <= 4
-          Remove event listeners: addEventListener () calls with corresponding removeEventListener() calls (do not use addEventListener() with weak reference as it decreases performance)
-          Deferred instantiation of UIComponents (e.g Viewstack children) aka lazy instantiation
-          Garbage collection: check Grant Skinner’s checklist
-          Interrupted execution of complex functions (especially when looping on a large data set): the function monitors its execution time and yields (returns) when the current call exceeds a given duration (usually, that of a frame at 24 fps, which is the default Flex framerate). It is called again on the next frame and so on and so forth until processing is complete. You can use callLater() for that.
-          Lazy loading of data
-          Use more efficient code. Favour re-use of existing code in the Flex framework rather than re-writing what exists. Favour simple solutions over complex ones when possible.
-          UID getter/setter in DTOs for improved performance in sorting / filtering of Array Collections
-          Too many data bindings decrease performance. Mainly use data binding to bind views to the presentation models. Use the ChangeWatcher class or direct assignment of values when possible.
-          Limit the number of calls to setStyle(). Use style declarations in CSS when possible.