The JPG encoding class after vector optimization is four times more efficient than the class with the same functions provided by Adobe.

Class file javasencoder: http://www.bytearray.org/wp-content/projects/fastjpeg/JPEGEncoder.as

 

Here is a little demo (encoding a 2880*2880 bitmapdata) showing the difference between the old version and the new one, if you cocould post your results through the comments that wocould be interesting:

 

 

 

 

So what did I do?

• I used bitwise operators as much as possible.
• I replaced all arrays with Fixed Length vectors.
• I used pre-incrementation rather than post-incrementation (thanks Joa for this one ).
• I casted to int almost all my vector indices access.
• Other minor stuff you always do to optimize your code