Figure 5 shows a CDF reflecting the proportion of points along the path above some throughput. The path was divided every 2 meters and then we computed the average throughput for each 2 meter segment. The CDF shows the cumulative throughput for each of these segments. Notice the scan-based efforts do not have wireless connectivity for significant proportions of the path due to a combination of 3-5 second overheads for scans and increasingly frequent handoffs due to poor AP selection. Even when moving at the slowest speed, scan-based efforts are without connectivity for 10% of the path, which is intolerable for applications like telepresence. Wireless performance improves as the device moves more slowly because scans are more reflective of actual wireless conditions.