A hot runner system adds a large heat load to a mold that needs to be isolated from the cavity. If the heat in the hot runner is not well managed extra heat may transfer into the cavity leading to extended cycle times. The manifold should be thermally isolated and controlled to minimize the heat rise in the cavity. Watch for issues where the hot tip contacts the cavity because there can be a large buildup of heat in this area that can lead to increased cycle times to control stringing from the heat.