ZF-10487: ZendAMF serialization slow? - Supplied patch not applied
I've compared ZendAMF to AMFPHP, by returning a dataset with 5000+ rows from a table, using the exact same code (both in PHP, and AS3). ZendAMF averages a 16 second return time, whereas AMFPHP returns in 3 seconds. I'm guessing the added time is coming from the process of serializing data to send back to Flash.