In a comment on my previous post Apache Sling JVM Performance, Gil Tene made an insightful comment about the potential possibility of performance impact from speed from the underlying environment or other tests. To accommodate for this possibility, I re-ran the tests inside a loop, randomizing order of the JVM execution for each iteration 25 times. As Gil predicted this did bring the OpenJDK implementations closer together with GraalVM and OpenJ9 as outliers. Startup Performance Interestingly, with the multiple iterations, OpenJ9 actually became the fastest starting JVM implementation, though practically tied with OpenJDK Hotspot and Azul Zulu. GraalVM was almost 6 seconds slower to start on average.