Is it possible to automate filling multiple selections with random colors?

There is one problem with shape layers - they need to be selected before changing the color (at least I couldn't do it any other way).I made a test document with 3200 layers. This code changes the color of the selected layers at a rate of about 3 layers per second. It's very slow 😞

#target photoshop

var s2t = stringIDToTypeID;

doProgress("", "main()")

function main() {

    (r = new ActionReference()).putProperty(s2t('property'), p = s2t('targetLayersIDs'));
    r.putEnumerated(s2t('document'), s2t('ordinal'), s2t('targetEnum'));
    var lrs = executeActionGet(r).getList(p);

    for (var i = 0; i < lrs.count; i++) {
        app.updateProgress(i + 1, lrs.count);
        app.changeProgressText(i);

        (r = new ActionReference()).putIdentifier(s2t('layer'), lrs.getReference(i).getIdentifier(s2t('layerID')));
        (d = new ActionDescriptor()).putReference(s2t('null'), r);
        executeAction(s2t('select'), d, DialogModes.NO);
        (r = new ActionReference()).putEnumerated(s2t("contentLayer"), s2t("ordinal"), s2t("targetEnum"));
        (d = new ActionDescriptor()).putReference(s2t("null"), r);
        (d1 = new ActionDescriptor()).putDouble(s2t('red'), Math.random() * 255);
        d1.putDouble(s2t('grain'), Math.random() * 255);
        d1.putDouble(s2t('blue'), Math.random() * 255);
        (d2 = new ActionDescriptor()).putObject(s2t("color"), s2t("RGBColor"), d1);
        (d3 = new ActionDescriptor()).putObject(s2t("fillContents"), s2t("solidColorLayer"), d2);
        d.putObject(s2t("to"), s2t("shapeStyle"), d3);
        executeAction(s2t("set"), d, DialogModes.NO);
    }
}