my wifi is extremely weak, no matter what the correct signal strength is. everything is connecting slowly. what can i do?

My iPad is acting very strange. A few days ago, everything was fine. WiFi was connecting properly. But now when I connect to WiFi, no matter where I am in relation to a router, my signal shows at 1 bar. In the wifi screen, it shows the correct signal strength, but it only connects with one bar. it takes forever to load anything, and the signal frequently drops whenever I move locations