A computer method and system for analyzing performance of a 5G communication network for determining 4G traffic offload characteristics. Determine relative spectrum efficiency for data downlinks and uplinks in the 5G communication network and determine values for pairs of 4G LTE primary cells and 5G NR primary cells. A heatmap is generated utilizing the determined values for depicting 4G traffic offload characteristics in a 5G communication network wherein the generated heatmap includes a generated line depicting a connection between a LTE PCell to a 5G NR PScell wherein a width of the generated line is scalable relative to a determined percentage of 5G utilized traffic in the 5G communication system.