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When using G1GC (Garbage First Garbage Collector), infrequently experiencing extended GC pauses means that the garbage collection pauses that occur during the collection of garbage from the Java heap are longer than usual or expected, but they don't happen frequently. Extended GC pauses can occur when G1GC has to move a large number of objects during the garbage collection process, or when there are performance bottlenecks in the hardware, software, or network infrastructure. The infrequent occurrence of extended GC pauses indicates that the G1GC is well-tuned for the application and that the heap size and other settings are properly configured. However, these pauses can still impact application performance and should be monitored to ensure that they don't exceed acceptable thresholds.