# Running really slow for a relatively simple program
**URL:** https://discourse.processing.org/t/running-really-slow-for-a-relatively-simple-program/20762
**Category:** Coding Questions
**Created:** [May 11, 2020, 11:14pm UTC](https://discourse.processing.org/t/running-really-slow-for-a-relatively-simple-program/20762 "2020-05-11T23:14:24Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Xabdro](https://discourse.processing.org/u/Xabdro)
#### Post date: [May 11, 2020, 11:14pm UTC](https://discourse.processing.org/t/running-really-slow-for-a-relatively-simple-program/20762/1 "2020-05-11T23:14:25Z")
I’ve made much more complicated programs than this yet its running at 30fps when at low resolution. If I go fullscreen it drops to less than ten fps. I think I must be missing something really obvious that is causing this massive slowdown but I can’t see what it is. Any help would be greatly appreciated.
```auto
float[] randomV;
int density = 200;
int lowB = 0;
int change = 1;
float hue = 0;
float bri = 0;
float r = 0;
void setup(){
size(500,500);
//fullScreen(P2D);
background(0);
//noLoop();
noFill();
strokeWeight(3);
randomV = new float[density];
generateRandomV();
colorMode(HSB,360,100,100);
}
void draw(){
background(0);
translate(450,250);
for(int i=density-1; i>0; i--){
hue = map(i,0,density,lowB,lowB+80);
bri = map(i,density,0,100,600);
stroke((hue+(randomV[i]*10))%360,100,bri,50);
r = randomV[i];
ellipse(-i-r,0,10+((i+r)*2),10+((i+r)*2));
}
if(lowB==280){
change = -1;
}else if(lowB==0){
change = 1;
}
if(frameCount%2==0){
lowB+=change;
}
}
void generateRandomV(){
for(int i = 0; i
### Author:  [@glv](https://discourse.processing.org/u/glv)
#### Post date: [May 11, 2020, 11:39pm UTC](https://discourse.processing.org/t/running-really-slow-for-a-relatively-simple-program/20762/2 "2020-05-11T23:39:27Z")
Hello,
It rocks with:
`size(1000, 1000, FX2D);`
and
`size(1000, 1000, P3D);`
P3D rapidly declined as density increased.
I added this to monitor frameRate:
```auto
if (frameCount%5 == 0)
surface.setTitle(str(frameRate));
```
[https://processing.org/reference/setTitle\_.html](https://processing.org/reference/setTitle_.html)
There is a comment about _FX2D_ here:
[https://processing.org/reference/environment/](https://processing.org/reference/environment/)
`:)`
---
### Author:  [@glv](https://discourse.processing.org/u/glv)
#### Post date: [May 12, 2020, 2:53am UTC](https://discourse.processing.org/t/running-really-slow-for-a-relatively-simple-program/20762/3 "2020-05-12T02:53:23Z")
Hello,
Another approach is to create all of your shapes in advance.
Reference:
[https://processing.org/tutorials/pshape/](https://processing.org/tutorials/pshape/)
In setup():
```auto
for (int i=density-1; i>0; i-=1)
{
//hue = map(i, 0, density, lowB, lowB+80);
//bri = map(i, density, 0, 100, 600);
//stroke((hue+(randomV[i]*10))%360, 100, bri, 50);
r = randomV[i];
float r1 = i+r;
float r2 = 10+(r1*2);
shapes[i] = createShape(ELLIPSE, -r1, 0, r2, r2);
}
```
Use the same loop in draw() but color and display shape the shape:
```auto
color c = color((hue+(randomV[i]*10))%360, 100, bri, 50);
shapes[i].setStroke(c);
shape(shapes[i], 0, 0);
```
[https://processing.org/tutorials/pshape/](https://processing.org/tutorials/pshape/)
[https://processing.org/reference/PShape\_setStroke\_.html](https://processing.org/reference/PShape_setStroke_.html)
With density of 1000 I got 60 fps with P2D, P3D, FX2D but slow with default renderer.
`:)`
---
### Author:  [@Xabdro](https://discourse.processing.org/u/Xabdro)
#### Post date: [May 12, 2020, 4:21pm UTC](https://discourse.processing.org/t/running-really-slow-for-a-relatively-simple-program/20762/4 "2020-05-12T16:21:42Z")
Thank you so much for your help. I’d not heard of FX2D. I’ve never encountered this level of slowdown with P2D. I assumed that since I was drawing 2D shapes I should use a 2D renderer so didn’t even think of P3D. Kind of strange. Probably above my level of expertise to understand why this is.
Thanks for the detailed response 😃
---
### Author:  [@jeremydouglass](https://discourse.processing.org/u/jeremydouglass)
#### Post date: [May 14, 2020, 6:23am UTC](https://discourse.processing.org/t/running-really-slow-for-a-relatively-simple-program/20762/5 "2020-05-14T06:23:54Z")
> [@Xabdro](#):
>
> I’ve never encountered this level of slowdown with P2D.
It is ellipse. I’m not sure why, but switch to rect 58-50 fps… back to ellipse, 17fps.