Why is Arrays.fill 265 times slower on G1GC?

The article shows that a seemingly simple Java operation, `Arrays.fill`, can become dramatically slower under G1GC even when no garbage collection occurs, revealing that GC choice can materially affect application throughput through JIT-generated memory barriers and low-level runtime behavior. For CIOs and technology leaders, the business implication is that JVM and GC settings are not merely technical tuning knobs—they can significantly impact latency, hardware efficiency, and capacity planning for Java workloads, especially at scale.