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Goals of this feature include allowing all garbage collectors to work smoothly with the AOT (ahead of time) cache introduced by Project Leyden, separating AOT cache from GC implementation details, and ensuring that use of the AOT cache does not materially impact startup time, relative to previous releases. The structured concurrency API simplifies concurrent programming by treating groups of related tasks running in different threads as single units of work, thereby streamlining error handling and cancellation, improving reliability, and enhancing observability. The G1 GC proposal notes that although G1, which is the default garbage collector of the HotSpot JVM, is designed to balance latency and throughput, achieving this balance sometimes impacts application performance adversely compared to throughput-oriented garbage collectors such as the Parallel and Serial collectors: