1 Correct answer
This should be a bit faster.
...#target photoshop;
if(documents.length){
var tLayers = getTextIds();
for(var a in tLayers){
selectLayerByID(Number(tLayers));
activeDocument.activeLayer.textItem.antiAliasMethod = AntiAlias.SMOOTH;
}
alert("All Done");
};
function selectLayerByID(ID, add) {
add = (add == undefined) ? add = false : add;
var ref = new ActionReference();
ref.putIdentifier(charIDToTypeID('Lyr '), ID);
var desc = new ActionDescriptor();
desc.putReference(charIDToTypeID('null'), ref)
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Haha, a bit? 
It went 100x faster now, thank you sir! 
I gotta say though, ActionScripts looks cryptic to me, could you point me in a direction to learn about it?
Thanks again man, much appreciated
This should be a bit faster.
That should be a lot faster! The only downside I see is that it has to select the layer and set the "smooth" property using Photoshop's API, which can be a little slow.
SuperMerlin, I made some adjustments to your code to set the smooth property through Descriptors without selecting layers, and using the layerIds you gathered. it should be a bit faster
#target photoshop
if(documents.length) {
var tLayers = getTextIds();
for(var a = 0; a < tLayers.length; a++) {
setTextLayerToSmooth(tLayers);
}
alert("All Done");
};
function getTextIds() {
var ref = new ActionReference();
ref.putProperty( charIDToTypeID( "Prpr" ), charIDToTypeID( 'NmbL' ));
ref.putEnumerated( charIDToTypeID('Dcmn'), charIDToTypeID('Ordn'), charIDToTypeID('Trgt') );
var count = executeActionGet(ref).getInteger(charIDToTypeID('NmbL')) +1;
var TextIDs = [];
try {
activeDocument.backgroundLayer;
var i = 0;
} catch(e) { var i = 1; };
for(i; i < count; i++) {
if(i == 0) continue;
ref = new ActionReference();
ref.putIndex( charIDToTypeID( 'Lyr ' ), i );
var desc = executeActionGet(ref);
if( desc.hasKey( stringIDToTypeID( 'textKey' ) ) ) {
var ID = desc.getInteger(stringIDToTypeID( 'layerID' ));
TextIDs.push(ID);
}
}
return TextIDs;
}
function setTextLayerToSmooth(layerId) {
var antiAliasDesc = new ActionDescriptor();
var antiAliasRef = new ActionReference();
antiAliasRef.putProperty( charIDToTypeID( "Prpr" ), charIDToTypeID( "AntA" ) );
antiAliasRef.putIdentifier( charIDToTypeID( "TxLr" ), layerId );
antiAliasDesc.putReference( charIDToTypeID( "null" ), antiAliasRef );
antiAliasDesc.putEnumerated( charIDToTypeID( "T " ), charIDToTypeID( "Annt" ), charIDToTypeID( "AnSm" ) );
executeAction( charIDToTypeID( "setd" ), antiAliasDesc, DialogModes.NO );
}
Thank you for all your help SuperMerlin, it's very enlightening, it doesn't seem there's a vast amount of people knowing much about this topic. I'll try to put two more questions in if you haven't lost your patience with me yet
I'm wondering about these three commands:
actionRef.putProperty( charIDToTypeID( "Prpr" ), charIDToTypeID( 'NmbL' ));
actionRef.putEnumerated( charIDToTypeID('Dcmn'), charIDToTypeID('Ordn'), charIDToTypeID('Trgt') );
var count = executeActionGet(actionRef).getInteger(charIDToTypeID('NmbL')) +1;
Could you explain what they do? From what I understand the putProperty assigns the value "NumberOfLayers" to the class "Property". I have no idea what putEnumerated do. The executeActionGet will return the number of layers because of the putProperty, right? I'm sorry if these are stupid questions, I'm just struggling to wrap my mind around how this works just my looking at the code I've looked around on several scripts on github, but it seems noone make comments in their ActionManager code?
Thanks man, I really appreciate the help you have given me
I'm sorry, I'm still confused So I tried removing the putProperty, and the script still worked, do I even need this? It doesn't seem to do anything?
Also, putEnumerated, could you explain what this actually does? I pass in the argument for document, ordinal and target, when I've done that I can get the number of layers by using executeActionGet(actionRef).getInteger(charIDToTypeID('NmbL')), but as I don't need putProperty to add the 'NmbL' property, why can I still get the number of layers?
If I just knew exactly what putEnumerated did it would be a lot easier to understand how this hangs together 
Ok, the putProperty is there to select ONLY this property from the action descriptor, and with this line included it can/does speed the process of getting the infomation.
The putEnumerated is the setup to get the descriptor inforation.
executeActionGet goes and fetchs the information.
Experiment with Chistoph's code abobe.
change
//layer information
ref.putEnumerated( charIDToTypeID("Lyr "), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") );
to
//document information
ref.putEnumerated( charIDToTypeID("Dcmn"), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") );
also
//Current app
ref.putEnumerated( charIDToTypeID("capp"), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") );
These will show what is available, if you add the putProperty line in Christoph's code you will see it only retrieves that property.
actionRef.putProperty( charIDToTypeID( "Prpr" ), charIDToTypeID( 'NmbL' ));
actionRef.putEnumerated( charIDToTypeID('Dcmn'), charIDToTypeID('Ordn'), charIDToTypeID('Trgt') );
Keep trying
Awesome, exactly what I was hoping for! Thank you for that detailed explanation, I think I get it now 
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