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Sure enough, out-of-the-box startup time for Netbeans 8.2 on Windows 8.1 increased dramatically against Oracle Java 1.8.0_191 (running quad-core I7 on SSD). There was no point in taking measurements -- it was up and ready in three seconds! This didn't seem possible with Netbeans but there it was. Everything worked the same as before ... only faster. Then the real shocker: RAM usage went from roughly 650M down to 268! Huh? If I can eliminate that much RAM usage for hosted server side deployments, it's going to translate into real cash savings.
On top of the performance upgrade and memory savings, I immediately noticed that Swing is visually better in J9 than OpenJDK [edit: with the HotSpot VM]. In particular, the default font rendering is really nice! In the past, OpenJDK has generally lagged behind Oracle Java for desktop applications and still does; but to my eyes, J9 is now at visual parity with Oracle (or perhaps better).
I realize that the J9 has been the JVM in Notes/Domino all these years but I've never attempted to benchmark it against other JVMs since IBM never really promoted it as a JDK for Windows. I'm currently using 9.0.1 FP10 which uses build 8.0.5.21 of J9.
Hopefully, IBM can manage to get the latest J9 into an upcoming fixpack. I sure have lots of Notes and Domino Java code that could benefit from it.