function getDelimitedPerfData() {
        var getValue = function (entry) {
            // return single value, or tab deliminted values for an array
            if (Array.isArray(entry)) {
                var i, values = "";
                 
                for (i = 0; i < entry.length; i++) {
                    values += entry[i];
                    if (i < entry.length - 1) {
                        values += ", ";
                    }
                }
                return values;
            } else {
                return entry;
            }
        };

        var testName,
            index,
            result = "";
        $.each(perfData, function (testName, entry) {
            result += getValue(entry) + "\t" + testName + "\n";
        });

        return result;
    }
Returns the performance data as a tab deliminted string
@returns {string}