The performance difference for 32-bit vs 64-bit JVMs can be significant for some workloads. I develop a desktop engineering simulation application in Java. Th

The performance difference for 32-bit vs 64-bit JVMs can be significant for some workloads. I develop a desktop engineering simulation application in Java. The simulation time for the same code running the same model on a 64-bit JRE is often almost half the time required on a 32-bit JRE. With simulation times measured in hours to days, this was an extremely nice "freebie" for painlessly migrating to a 64-bit JRE. We still support 32-bit JREs for each release as many corporate IT departments are still migrating users from 32-bit Windows environments to 64-bit. However, we strongly recommend the 64-bit version for the additional memory space that can be allocated and the reduced simulation time.