By: Dr. Heinz Kabutz, JavaSpecialists.eu (2018)
Authors: S. M. Mostafa, S. M. R. Islam (2014), International Journal of Computer Applications (Free on researchgate.net) 32 bits java
"Java's 32-bit vs. 64-bit Performance: An Empirical Study" By: Dr
Proceedings of the 8th ACM/SPEC on International Conference on Performance Engineering (ICPE '17) – but a more directly applicable, freely available technical report is: By: Dr. Heinz Kabutz
It shows benchmarks for SPECjvm2008 on Windows/Linux, confirming that 32-bit can outperform 64-bit for CPU-bound tasks due to reduced memory traffic.