Yes that would be possible - sorry didn't mean to leave that out of option 1. To be honest in the time available it would improve our bottle neck, but not get

Yes that would be possible - sorry didn't mean to leave that out of option 1. To be honest in the time available it would improve our bottle neck, but not get rid of it. Option 2 would certainly produce the fastest development setup. I have realised that in trying not to cloud the decision by telling everyone what the tech was, I may have done you all a disservice by not giving enough information! So here it is: The existing tech is Adobe Flex. Provides great RIA, but not good for iPhone/iPad. It makes up only the front end of the app, with everything else php based. The new tech would be to re-write the front end in HTML/JS, leaving the backend php as is. So another reason for rewriting the code is that we will likely want to dump flex at some point.