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2.2 32-bit vs 64-bit JVM When it comes to performance, you may be inclined to believe that a 64-bit JVM is always better than a 32-bit JVM. The truth is that if the memory requirements are reasonably low (less than the 2Gb limit you get with the 32-bit JVM) – the performance differences between 32-bit and 64-bit JVM is negligible. Now with most modern architectures, you will get a 64-bit operating system and with that you can run a 64-bit JVM. Couple that with the cheap cost of memory, and by all means, you will see an increase in performance running a 64-bit JVM with even 4Gb of memory than you would with a 32-bit JVM with only 2Gb of memory. In Summary, if your operating system and hardware supports it along with enough memory committable, use the 64-bit JVM.