Hi Pvdn !!!
did u saw it ? http://cycling74.com/forums/topic.php?id=4492 . i had problems with huge amount of iterations , js even hanged my max :/ but with relaxed flow its working pretty well .
ive read somewhere (cant find the thread) that we should not rely on JS considering time sensitive operation ,there is small (but present) latency around 1 .. 5ms .
It’s worth mentioning that it also depends how you write your code. For instance, using global variable can be significantly slower than using local variable.