I've been playing the Java version of Minecraft for two days now, testing the realms with another player. During the two days I experience a lot of lag that makes it unplayable. After being frozen for 10 sec or so, I get the title exception followed by an existing connection was forcibly closed by the remote host.
I tried to download a more updated version of Java and disable Windows Firewall and nothing, I still have these problems. What can I do? It's desperate to lose realms time because of this.