Looping through layers is slow.

Hi, so i am trying to make a script that goes goes through all the layers of an a document, sets the size of the layer to a specified width and height and export it in a separate file. I finished the script but it really really slow. I read that accessing layers from the DOM is slow and that i should use the ActionManager instead, but I can't find any documentation on how to use the ActionManager.

This is what I have so far:

Ok so right now I am creating a document with the size I want. Copy the layer I want from the current doc to the new one and save the document. When I see a group I create a folder on the Directory and call the function recursively.

var refDoc;
var tempDoc;

function main(){
        refDoc = app.activeDocument;        tempDoc = app.documents.add(500, 500, 72, "tempDoc", NewDocumentMode.RGB, DocumentFill.TRANSPARENT);        app.activeDocument = refDoc;        mainFolder = app.activeDocument.path + "/test";          savetAllLayers(app.activeDocument, mainFolder);        tempDoc.close (SaveOptions.DONOTSAVECHANGES);
}

function saveAllLayers(group, folderName){
    var groupFolder = new Folder(folderName)    for (var i = 0; i < group.layers.length; i++){            if (group.layers[i].typename.valueOf() === "LayerSet"){                var groupFolder = new Folder(folderName + "/" + group.layers[i].name);                if (!groupFolder.exist){                    groupFolder.create();                }                saveAllLayers(group.layers[i], groupFolder);            }            else if (group.layers[i].typename.valueOf() === "ArtLayer"){                try {                    app.activeDocument = refDoc;                    group.layers[i].copy();                    app.activeDocument = tempDoc;                    var targetLayer = tempDoc.artLayers.add();                    tempDoc.paste();                    tempDoc.activeLayer.resize(500, 500);                    var options = new ExportOptionsSaveForWeb();                    options.fomat = SaveDocumentType.PNG;                    options.PNG8 = false;                    options.transparency = true;                    options.optimized = true;                    //Export Save for Web in the current folder                    tempDoc.exportDocument(File(folderName +'/' + group.layers[i].name +'.png'), ExportType.SAVEFORWEB, options);                    targetLayer.remove();                } catch (e){                    alert("Error on layer: " + group.layers[i].name + "\n\n\n" + e.message);                }            }    }    return
}}

How can I use the ActionManager to achieve this? Thank you.