fps / tick counter with settable average, ported it from somebody (on the web) that wrote it in a typesafe language..

fps - tick counter

//cant use const because of IE9, IE9 does not support const.

var MAXSAMPLES = 100;
var tickindex=0
var ticksum=0;
var ticklist = [];

for(var i = 0; i < MAXSAMPLES; i++)
  {
    ticklist[i] = 0;
  }


var CalcAverageTick = function(newtick)
{
    ticksum-=ticklist[tickindex];  /* subtract value falling off */
    ticksum+=newtick;              /* add new value */
    ticklist[tickindex]=newtick;   /* save new value so it can be subtracted later */
    if(++tickindex==MAXSAMPLES)    /* inc buffer index */
        tickindex=0;

    /* return average */
    return(ticksum/MAXSAMPLES);
}