Does Java 64 bit perform better than the 32-bit version?

java 64-bit 32-bit
Joshua picture Joshua · Feb 26, 2009 · Viewed 23.5k times · Source

I noticed Sun is providing a 64-bit version of Java. Does it perform better than the 32-bit version?

Answer

Darron picture Darron · Feb 26, 2009

Almost always 64 bits will be slower.

To quote Sun from the HotSpot FAQ:

The performance difference comparing an application running on a 64-bit platform versus a 32-bit platform on SPARC is on the order of 10-20% degradation when you move to a 64-bit VM. On AMD64 and EM64T platforms this difference ranges from 0-15% depending on the amount of pointer accessing your application performs.

There are more details at the link.

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