A minor item for further cranking up the efficiency of complex NPCs. Limits the scope of a variable by declaring it will no longer be used. For instance:
for(this.i=0;this.i<playerscount;this.i++){
...
}
discard this.i; //implicit
because you're unlikely to care that this.i still =playerscount an hour later. Would avoid the usual scripting mess of having one NPC with 70 variables, all of which were intended to be temporary but are still holding floating-point data; granted, that's only 70bytes, but it adds up.