So I'm currently having a 300mbps plan. Wifi card I'm using is TP-Link Archer T9E, router is Tenda AC18 and Im using 5Ghz wireless connection. Speedtest (direct speedtest with my ISP) shows only around 50-90mbps speed. But, when I'm downloading games from steam, the speed is 20mb/s (where I should actually getting around 8-10mb/s real download speed with the result of the speedtest). Games download from steam went smoothly and keeps around 20mbps, but when I'm watching twitch, it even spikes at 720P60 resolution. So, what could possibly go wrong actually?