Note: Adobe Technical Support doesn't support or assist with issues using elements beyond these limits.
These limits are tested in the Flash and Flash Player development cycles. But, if you choose to develop beyond these boundaries, Adobe cannot guarantee consistent behavior. You could experience varied issues including graphic artifacts, low memory, slow graphic performance, and crashing. If you are experiencing these issues, closely examine the requirements of the project and rearchitect within these limits.
Some Flash users are curious about the limits of Flash in the areas of symbols, layers, file size, and ActionScript expressions. While these limitations are not documented, every program has logical limits. Many of those limits are difficult to pinpoint, as they can vary from computer to computer. And, they are often dependent on things such as RAM, CPU, operating system, video card, and browser version. There is an additional factor of chance, as users often use Flash in ways that the program's designers didn't intend.
Sometimes an intended behavior is achieved, and other times it fails. A failure can be due to a limit in the program or on the machine being used for playback.
When asking the question, "how large can a Flash movie be?" defer to the obvious. Flash was created to make small, streamable, vector-based files for web delivery. The bulk of the documentation addresses this usage, and it is where Flash performs best. Flash can also be used for nonstandard purposes, such as CD authoring, desktop publishing, stand-alone application building, and other uses. While you can do these things, it's important to ask yourself, "Is this program designed to do what I am attempting? Is there a better program for this use, if this one fails?"
- 16,000 frames: When targeting Flash Player, exceeding this limit causes the movie playback to stop. While most developers never reach this limit, it is possible. If your movie must have more than this number of frames, try creating multiple movies with fewer than 16,000 frames each and then linking the movies together using a method such as the ActionScript 2 loadMovie() command.
- 16,000 layers: Flash can't work with more than 16,000 layers in a movie.
- 16,000 loaded movies: You cannot load more than 16,000 movies into Flash player.
- 16,000 symbol instances: Flash does not allow more than 16,000 symbol instances in a Flash movie
- 2880 x 2880 px canvas size: A Flash movie cannot be larger than 2880 px wide or 2880 px tall.
Combining multiple limits in a single Flash file creates greater risk. Flash and Flash Player are optimized for normal circumstances, and testing the extreme limits of Flash can cause memory and other operating system issues.
- 32 KB: The limit in file size for any single ActionScript script such as a class. If you require a larger file, try breaking up your code into smaller parts or delegating responsibilities to other classes.
- 12 bytes: The minimum space in memory taken up by ActionScript variables. It does not include additional space for name or enumeration flags. The actual content (for example, the actual string assigned to a string data type) adds additional bytes.
- 15 seconds: The amount of time a loop runs until a dialog with the message, "A script in this movie is causing Flash Player to run slowly" appears. You can then stop the script.
- 125 components: Adobe recommends that Flash Applications built with Version 2 components be limited to 125 components. It is a suggestion for best performance, not a hard rule.
Because ActionScript is an interpreted language, variables take up quite a bit more space than they would in a compiled language like C++. It is difficult to predict exactly how much space because of the interpreter's various data structures.
The possibilities are endless, but memory is not. Having described the theoretical limits above, it is not recommended that users approach them for practical purposes.
Flash Player also imposes several limits of its own. For more details, see:
- "Understanding Flash Player 10 SWF and bitmap size limits" (TechNote cpsid_49222).
- "Limited full-screen keyboard input (Flash Player 10)" (TechNote kb405548).