javascript for automation vs applescript - dimensions

Hello,

I wrote two scripts. jxa script works very slowly compared to ap. the scripts are supposed to count the dimensions of selected files with a resolution of 2540. There may be about 30 selected files and then it feels that jxa works several times slower, but I need jxa for windows. How can I speed up this script?

jxa:

var suma = 0;

var app = Application.currentApplication();
	app.includeStandardAdditions = true;

var finder = Application("Finder");
var imageEvents = Application("Image Events");

for(var i=0; i<finder.selection().length; i++) {
	var path = finder.selection()[i].url();
	var newPath = path.substring(7);
	var myPath = decodeURI(newPath);
	var img = imageEvents.open(myPath);

	var w = img.dimensions()[0];
	var h = img.dimensions()[1];
	var wRes = img.resolution()[0];
	var hRes = img.resolution()[1];

	var m2 = (w/wRes*0.0254) * (h/hRes*0.0254);
	var suma = suma+m2; 
};

app.displayDialog(suma.toFixed(3));

ap:

tell application "Finder"
	set lista to selection
	repeat with i from 1 to (count lista)
		set {item i of lista} to {item i of lista as string}
	end repeat
end tell

set m2 to 0

tell application "Image Events"
	repeat with i from 1 to (count lista)
		launch
		set plik to open (item i of lista)
		copy the dimensions of plik to {x, y}
		close plik
		set suma to ((x * 0.01) / 1000) * ((y * 0.01) / 1000)
		set m2 to m2 + suma
	end repeat
end tell

display alert m2

thanks for the answers!