Hazelcast connects a group of networked/clustered computers to pool their RAM and CPU power, allowing programs to share data structures and conduct parallelized workloads in the cluster. This provides a significant speed advantage, which has become critical in an environment with billions of mobile, IoT devices, and other sources continuously streaming data. With all relevant information in RAM, there is no need to traverse a network to remote storage for transaction processing. The difference in speed is significant – minutes vs. sub-millisecond response times for complex transactions done millions of times per second.