Not to besmirch your AS coding abilities, nor to reopen old wounds, but the dev in me is begging some questions and debugging your comment. Your first issue seems like it was likely caused by using an incorrect ratio of viewable content to viewport height. I can't say I've ever seen the Flash player give erroneous info as to where the mouse was positioned, and Flash's Number type is accurate enough for this type of operation.

The second issue seems more likely to have been an issue with processor load rather than a memory, I'm guessing? I usually solve the issue with using TextField's cacheAsBitmap property. It uses more memory, at the expense of greater processor load. I develop on a low-powered Mac, and have never been disappointed by the tradeoff, but YMMV. Sometimes, playing with the AntiAliasMode of the TextField has unexpectedly good results (processor-wise), but I admit it's very fiddly :)

Completely agree on the framework front; Abobe's attempts to solve UI issues in Flash have lead to an even more fractured dev response. Cappuccino's UI looks extremely clean, and seem to function remarkably well, without sacrificing so much on the filesize/response vectors.

Again, just geeking out; I've been (and continue to be) in that position more times than I'd like to count in developing for Flash. Thanks for the great comment :)

When you write desktop apps, you have to do the same thing - usually (lazy loading). I'm not defending flash, I'm just saying.

When I used to do Win32 programming, I'd usually cache a bitmap and scroll that. For larger stuff though, lazy loading all the way.