Yes, Wi-Fi boosters work. They help extend the range of your network. If this is the cause of your poor performance, then they can boost speed. However, they can’t make your Wi-Fi faster than your router or service package allows. In other words, you can’t subscribe to a 50 megabits per second (Mbps) plan and expect 500 Mbps by adding a Wi-Fi booster — it doesn’t work like that.