I finally found a way to block attackers to my websites

I had performance issues for years with my WP sites. Countless useless robots constantly scanned them. The server was overloaded all the time. All sites were slow. Attackers were trying to find a way to break in. I tried many plugins, but none of them helped. This plugin solved my problem. I was able to identify and block IPs that attacked my sites constantly. Since I blocked attackers, everything is working flawlessly. I wish I had it earlier. Thumbs up for simplicity, too.