You know, I did, but I found that the app was significantly slower than in 32-bit mode on three different JVMs (Sun, Apple, and OpenJDK), by about... 20%, actua

You know, I did, but I found that the app was significantly slower than in 32-bit mode on three different JVMs (Sun, Apple, and OpenJDK), by about... 20%, actually. And it did use twice the memory. Some googling about seems to show that this is normal; perhaps there's something else I can tweak in 64-bit mode that I missed? Even so, we don't reap a lot of benefit from using a 64-bit JVM at this point, because our app uses so little memory, although that's likely to change down the road as we load the system more heavily.