Bukkit

Hello! When my friends and I start a match, we wait for the 30 seconds to finish so we can loot mid. But for some reason, the instant the 30 seconds finishes, time freezes for the whole server for about 5 seconds. We can still move but chests won't open and if you are in the lobby, ServerSigns don't function. The Survival Games map is very small, maybe only 200 blocks in total. I have 3 gigabytes of ram allocated for my server. I have been told that this is more than enough for this plugin but I'm not sure. I have run tests such as looking at the console while the freezing occurs. The console acts as if nothing is wrong and my system's CPU and memory don't spike. Also, does anyone know how to make it so that the time doesn't change when the match starts? Lol! (BTW I have tested running my server with 8 gigabytes and literally nothing changed, guess it's safe to say that it isn't because I haven't allocated enough ram.)