how to avoid ugly and slow animation of jqm when load an image on page loaded?

I am using camera plugin of cordova to take a photo on camera success i have this function:

previewPhoto: function (filename) {
console.log("previewPhoto: execute numFoto " + this.numFoto);
var img = new Image();
img.onload = function () {
$("#hGallery").append("<span id='image" + this.numFoto + "'></span");
$("#image" + this.numFoto).append("<a id='btnFotoAnteprima" + this.numFoto + "' href='#'></a>");
$("#btnFotoAnteprima" + this.numFoto).append("<img id='fotoAnteprima" + this.numFoto + "' src=" + img.src + " width='128px' height='128px'/>");
//camera.refreshData();
}
img.src = filename;
if (app.storage !== undefined) {
console.log("key foto: " + "foto" + this.numFoto);
app.storage.setItem("foto" + this.numFoto, filename);
console.log("fotos " + app.storage.getItem("foto" + this.numFoto));
} else {
console.log("Sorry! No Web Storage support..");
}
this.numFoto++;
},

Simply i append the photo taked with the plugin to the page but i obtain this ugli animation:

i have this page:

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