Welcome,

my problem is caused by this code:

1. PGraphics canvas;
   void setup() {
           size(800,600);
           canvas = createGraphics(width, height, P2D);
   }
   
   void draw() {
           canvas.beginDraw();
           background(235);
           canvas.endDraw();
           image(canvas, 0, 0);
   }

Always when I run it, the whole system just hangs: screen flickers and displays some snippets of different windows and computer does not react for any actions I undertake.

Running this code doesn't have any noticeable impact on processor's usage / RAM.

Is there anything I do wrong in above code?

I use Ubuntu Karmic Koala.