this normally happens because your code is to slow. post it here and we can have a look where to optimize.

btw. frameRate() will try to set an upper limit, read it as "max frame rate".

F

OK, Here I´m once again, I wrote the program in a completely new structure. Lets say I brought order in it! It still does´t run as wished, I hope you can take a Look around. I would apreciate it a lot. And believe me, once I reach a better level I´ll be also helping the needed onces remembering times like this one

thats the class Walzen

class Walzen{
 // screen var
 float xpos, ypos, tempypos, rest_posy, v0, vel, acc, anker_ypos;
 PImage img;
 boolean over, velMax, velMin, fest, pressed, released;

 // physical var
 float mass, k, damp, accel, force;

 int me;

 Walzen (float x, float y, PImage i, float m, float d, float k, int id ){
   xpos=  x;
   ypos=  y;
   img=   i;
   mass=  m;
   k=     k;
   damp=  d;
   me=   id;
 }

 void setv0(){
   v0= random(0.5, 1.5);
 }

 void setVel(){
   if(!over && !velMax  && !velMin){
     vel=v0+acc;
   }
   if(vel>= 90){
     velMax= true;
   }
   else{
     velMax =false;
   }
   if(vel<= 1.4){
     velMin= true;
   }
   else{
     velMin=false;
   }
 }

 void setAcc(){
   if(over && otherOver()){
     acc=   random(1, 1.25);
   }
   else{
     if(velMax && otherVelmax() && released){
       acc= random(-0.5,-1);
     }
   }
 }

 boolean otherVelmax(){
   for(int i=0; i<num; i++){
     if(i!= me){
       if( walzen[i].velMax){
         return true;
       }
     }
   }
   return false;
 }

 boolean otherOver(){
   for(int i=0; i<num; i++){
     if(i!= me){
       if( walzen[i].over){
         return true;
       }
     }
   }
   return false;
 }

 float ankerPoint(){
   return ((ypos/yU)%100)*yU;
 }

 void setYpos(){
   if(!velMin && !over){
     ypos+= vel;
   }
   if(velMin && !over)
   {
     tempypos=ypos;
     rest_posy = ankerPoint();  

     force = -k * (tempypos - rest_posy);  // f=-ky
     accel = force / mass;             // Set the acceleration, f=ma == a=f/m
     vel = damp * (vel + accel);     // Set the velocity
     tempypos = tempypos + vel;               // Updated position
     ypos= tempypos;

     if( vel==0 ) {
       over = true;
     }
     else {
       over = false;
     }
   }
 }
 void update(){
   if(pressed){
     if(over){
       setv0();
     }
     setAcc();
     setVel();
     setYpos();
   }
 }
 void draw(){
   image(img, xpos, ypos);
 }
}

//and here is the Principal program

PImage b;
int num = 3;
int N=11;  //number of objects in the picture
float yU;
Walzen[] walzen = new Walzen[num];
float [] vel= new float [num];
boolean feder;

void setup()
{
 b = loadImage("wKopie.jpg");
 size(400,300);
 smooth();
 frameRate(30);
 yU= b.height/N;
 translate(0, (-762-yU));
 walzen[0]= new Walzen(50, 5, b, 8.0, 0.98, 0.1, 0);
 walzen[1]= new Walzen(150,5, b, 8.0, 0.98, 0.1, 1);
 walzen[2]= new Walzen(250,5, b, 8.0, 0.98, 0.1, 2);
 
}


void draw()
{  
 background(#FFFFFF);
 
 for(int i=0; i<=(num-1);i++){  
   walzen[i].update();
   walzen[i].draw();
   println(walzen[i].ypos+" FR "+frameRate+"yU"+ yU);
 }  
}

void mousePressed()
{
 for(int i=0; i<num; i++) {
   walzen[i].pressed=true;
 }
}

void mouseReleased()
{
 for(int i=0; i<num; i++) {
   walzen[i].released=true;
 }
}

Thanks in forward!
Gustavo

Ok, Thanks once again, it´s good to feel helped! I´m now checking & changing the details you metioned, the code it´s allmost there! it allmost runs as I wish!
Ass soon as I´m finished  (and I think i´ll be tomorrow), I´ll post it here! in order to share the achievements!

Ich hasse Katze!
Eskimo, wo kommst du her?

General optimization tip: if you're having frame rate problems, they will only become worse if you start printing out the frame rate each frame.  I usually set up something to average the frame rate over the past 30 or so frames and only print it out once a second or so to get a better estimate (the single-frame frame rate is a bit volatile).  I'd post code, but I don't have any that's not attached to big sketches...basically, just have an integer counter variable, and increment it each frame, only printing if counter%30==0.  This will tend to give you a slightly better sense of your code's speed, though the amount that print statements slow down the code differs from computer to computer.