YugabyteDB outperforms Apache Cassandra in both throughput and 99th percentile (p99) latencies, according to the Yahoo! Cloud Serving Benchmark (YCSB). This is due to YugabyteDB's use of the RAFT consensus protocol, which guarantees strong consistency without amplifying read operations or requiring round-trips to replicas. Additionally, YugabyteDB performs better in read-modify-write workloads and during compactions, and does not suffer from garbage collection pauses or memory tuning challenges. The database also utilizes larger memory for better performance, making it a more efficient and scalable alternative to Apache Cassandra.