I have been wondering for a while now about how network utilization on a router works. I only share the router with my brothers and it always says that I only use about .5% of the available network. This is when I watch videos or play games like ESO or LoL. I always have terrible lag while playing ESO, so I was confused when I did a speed test online and discovered that I have excellent internet. Finally, I did a speed test while looking at the network utilization and it was at about 40% during the speed test and immediately dropped back below 1% when the test was concluded. What causes this?