Knockout triggering a "slow script" warning in IE

I have a grid of observables and computed observables. The first line contains the interest rates used as a multiplier against the values ​​in all the lines below. The user can edit the interest rate value, and Knockout processes all cascading updates. I also need a separate text box in which the user can enter a new interest rate, which will be applied to each interest rate in the grid.

The initial binding is working fine and the 1 percent rate update is also great.

A javascript warning occurs when a user enters a value in a text box, and I go through the view model, updating each interest rate to match. The grid columns are actually monthly values, so the cycle for updating the interest rate is performed only 12 times.

I tried the throttle expander, but this did not solve the problem. Any ideas?

Update: not sure if this will help, but I added the code

$("#NewRate").change(function (e) {
    var newRate = parseFloat($(this).val());
    for (var i = 0; i < 12; i++) {
        viewModel.resourceCategory.monthAmounts[i].amount(newRate);
    }
});

function ConvertToDate(jsonDateString) {
    var re = /-?\d+/;
    var m = re.exec(jsonDateString);
    return new Date(parseInt(m[0]));
}

function MonthAmount(amount, dateKey) {
    var self = this;
    self.amount = ko.observable(amount).extend({ throttle: 1 }); //using the throttle to avoid "long running script" warning in IE
    self.dateKey = ConvertToDate(dateKey);
    self.monthIndex = self.dateKey.getMonth();
}

function ResourceCategory(name, monthAmounts) {
    var self = this;
    self.name = name;

    self.monthAmounts = ko.utils.arrayMap(monthAmounts, function (monthAmount) {
        return new MonthAmount(monthAmount.Amount, monthAmount.DateKey);
    });

    self.totalAmount = ko.computed(function () {
        var sum = 0;
        for (var i = 0; i < self.monthAmounts.length; i++) {
            sum += parseFloat(self.monthAmounts[i].amount());
        }
        return sum.toFixed(2);
    }).extend({ throttle: 1 }); //using the throttle to avoid "long running script" warning in IE

    self.averageAmount = ko.computed(function () {
        return (self.totalAmount() / self.monthAmounts.length).toFixed(2);
    }).extend({ throttle: 1 }); //using the throttle to avoid "long running script" warning in IE

}
function ResourceCategoriesMonthTotal(monthIndex, resourceCategories) {
    var self = this;
    self.monthIndex = monthIndex;
    self.dateKey = new Date(new Date().getFullYear(), monthIndex, 1);
    self.amount = ko.computed(function () {
        var val = 0;
        for (var i = 0; i < resourceCategories.length; i++) {
            val += parseFloat(resourceCategories[i].monthAmounts[self.monthIndex].amount());
        }
        return (val).toFixed(2);
    }).extend({ throttle: 1 }); //using the throttle to avoid "long running script" warning in IE
}

self.resourceCategoriesMonthTotals = new Array();
for (var monthIndex = 0; monthIndex < 12; monthIndex++) {
    self.resourceCategoriesMonthTotals.push(new ResourceCategoriesMonthTotal(monthIndex, self.resourceCategories));
}

self.resourceCategoriesTotal = ko.computed(function () {
    var val = 0;
    for (var i = 0; i < self.resourceCategoriesMonthTotals.length; i++) {
        val += parseFloat(self.resourceCategoriesMonthTotals[i].amount());
    }
    return (val / self.resourceCategoriesMonthTotals.length).toFixed(2);
}).extend({ throttle: 1 }); //using the throttle to avoid "long running script" warning in IE