APEX

I'm using the following javascript to loop through some of the charts on the page for a kiosk type of look:

textlist = ["chart1","chart2","chart3","chart4"];
start = 0;


setInterval(function(){
  if(start>3){ start =0;}
  $('#' + textlist[start]).fadeIn(2000).delay(5000).fadeOut(2000);
start++;
},10000);

It fades correctly however it appears as if it is loading the chart everytime it fades back in. I was hoping not to ping the server over and over again. I see what looks like a loading wheel. Is this a default of APEX to reload a chart that has the display value toggled?

thanks

Rob.