You probably want to build a multizone update to update just the necessary
zones. Here is a snippet of some of my code that updates zones only if they
are visible in that particular context:
public MultiZoneUpdate getPriceMultiZoneUpdate() {
MultiZoneUpdate update = new MultiZoneUpdate("totalPriceZone",
totalPriceZone);
if(isSubtotalVisible()) {
update = update.add("subtotalZone", subtotalZone);
}
if(isDiscountVisible()) {
update = update.add("totalDiscountsZone", totalDiscountsZone);
}
if(isSalesTaxVisible()) {
update = update.add("totalSalesTaxZone", totalSalesTaxZone);
}
if(isFulfillmentFeeVisible()) {
update = update.add("totalFulfillmentFeeZone",
totalFulfillmentFeeZone);
}
return update;
}
