max $strAction length?

Hello ming-dev fans,

When issuing 

  $movie->add(new SWFAction(str_replace("\r", "", $strAction)));

just once in the ming script, what is the maximum acceptable string
length for $strAction? I mean, both programatically and in terms of what
the Flash MX player supports. Is it better to issue $movie->add(new
SWFAction()) multiple times with shorter strings rather than just once
with a long string? The reason I'm asking is, with extremely large
strings my Flash MX players on Windows (7) and Linux (6) crash and I'm
trying to pinpoint the cause of this problem. Thanks.

-Laurent