Text objects and memory
Use the Adobe® Flash® Text Engine for read-only
text; use TextField objects for input text.
Flash Player 10 and AIR 1.5 introduced a powerful new text engine,
the Adobe Flash Text Engine (FTE), that conserves system memory.
However, the FTE is a low-level API that requires an additional
ActionScript 3.0 layer on top of it, provided in the flash.text.engine
For read-only text, it’s best to use the Flash Text Engine, which
offers low memory usage and better rendering. For input text, TextField
objects are a better choice, because less ActionScript code is required
to create typical behaviors, such as input handling and word-wrap.