Fullcalendar io takes time to generate calendar only in IE - fullcalendar

Question

Here is the ajax code, am doubting the resource section because it has 645 data's in the array. when i put small amount of static data's it works. Chrome, firefox and safari works fin only in IE it takes time to generate the calendar.
any one can help me on this please.
//get vehicle to calendar
$.ajax({
method: "GET",
url: '#Url.Action("WP", "WeeklyPlan")',
cache: false,
data: {
}, success: function (data) {
resource = []
events = []
var vehiclesWithReserations = data.vehicles;
if (vehiclesWithReserations == null) {
hideLoader();
toastr.warning(data.message);
return;
} else if (vehiclesWithReserations.length == 0) {
hideLoader();
}
var holidayList = data.holidays;
$.each(vehiclesWithReserations, function (i, v) {
resource.push({
id: v.FuhrparkFahrzeugID,
title: v.ModellName,
field: v.LocationId,
zuteilung: v.ZutName,
nvx: v.NVX
});
for (var q = 0; q < v.Reservations.length; q++) {
events.push({
id: v.Reservations[q].ReservationID,
resourceId: v.FuhrparkFahrzeugID,
start: moment(v.Reservations[q].DateFrom).toDate(),
end: moment(v.Reservations[q].DateTo).toDate()
})
}
});
generatecalender(holidayList);
}