G1 is Java's default garbage collector in most environments and its throughput has been considerably improved in JDK 26 by streamlining its write barriers, which are discussed in this episode together with regions, concurrent marking, and card table…

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JDK 26 significantly improves G1 garbage collector throughput by streamlining its write barriers. This Inside Java Podcast episode (recorded at JavaOne 2026) features a deep dive with HotSpot GC engineer Stefan Johansson, covering G1 regions, write barriers, concurrent marking, card tables, and how JEP 522 lays groundwork for G1 becoming the universal default collector across all Java environments.

Episode 54 “How JDK 26 Improves G1's Throughput” [AtA] – Inside.java