Add a very simple image pool to limit the amount of new images loaded. Hoping it will fix the screen sometimes stopping.

res/app/components/stf/screen/imagepool.js

@@ -0,0 +1,23 @@
+function ImagePool(size) {
+  this.size = size
+  this.images = []
+  this.counter = 0
+}
+
+ImagePool.prototype.next = function() {
+  if (this.images.length < this.size) {
+    var image = new Image()
+    this.images.push(image)
+    return image
+  }
+  else {
+    if (this.counter >= this.size) {
+      // Reset for unlikely but theoretically possible overflow.
+      this.counter = 0
+    }
+
+    return this.images[this.counter++ % this.size]
+  }
+}
+
+module.exports = ImagePool