CRaC vs Leyden: Comparison of Two Approaches to Remove Slow Startup in Java - DevOps.com
Briefly

The slow startup problem in Java applications is not just about Java, but rather the JVM warmup in complex frameworks that can adversely affect performance.
Leyden and CRaC initiatives show promise in mitigating slow startups by checkpointing and restoring applications on the HotSpot JVM, making the entire process more efficient.
Read at DevOps.com
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