When configured for fast restartability ("localRestartable" persistence strategy), BigMemory becomes active on restart after all of the in-memory data is loaded. The amount of time until BigMemory is restarted is proportionate to the amount of in-memory data and the speed of the underlying infrastructure. Generally, recovery can occur as fast as the disk speed. With an SSD, for example, if you have a read throughput of 1 GB per second, you will see a similar loading speed during recovery.