Feature idea for Image Converter

Yes I am trying this :

function test(i)
{
  let imgname = `rc${i}.img`;
  console.log(imgname);
  let imgdata = require("Storage").read(imgname);
  if ( !imgdata ) {
    console.log("cant find image");
  }
  try{
    g.drawImage(imgdata);
  } catch(e) {
    try{
      g.drawImage(E.toString(imgdata));
    }
    catch(e) {
      console.log(e);
      console.log("too large to flatstring");
    }
  }
  Bangle.setLCDPower(true);
}

function hashow() {
  let delay = 1000;
  let hihi = 27;
for(var lol=1;lol<=hihi;lol++){
  setTimeout(test,delay*lol,lol);
}
}

And the memory is just getting more and more full, because of the for loop. Is there a way to free memory within a for loop to run a task like this? Its meant to be a slideshow of images..
EDIT: its related to using setTimeout within the loop I think, it doesnt activate the garbage collection cos of the setTimeout or something?