I kept getting calls from some blue ribbon ball place . Finally asked them to explain and they said it ' s because I would have bought a shopping centre raffle ticket . Angrily told them to never call me again . <| sep |> Memory can be tracked in plugins or panels . You just need it to tell you more than just allocated and max memory . Free memory is important , though it ' ll vary a lot as Minecraft creates and discards objects by the truckload . I know the default garbage collector is not fit for 24 GB . XXUseConcMarkSweepGC is the one people recommend , and analyses seem to support that . There are other flags too that may have varying impact but are usually defaulted to good values . XXUseLargePages is another recommended for large allocation sizes .