Java is particularly slow on floating point -- why?
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Immature Compiler and library Technology
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Does not Exploit optimally hardware on PowerPC and Intel platforms
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Current Java rules optimized for SPARC architecture .....
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Does not use well known compiler optimizations for blocking, unrolling, reorganizing expressions
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Current Java rules imply that if careful (avoid indeterminate threads and use of JNI) Java not only runs everywhere but gets identical results everywhere
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Need to study Reproducibility -- Performance Trade-offs
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Maybe people have emphasized performance too much but you are not going to change their minds quickly -- should be tolerant of all perceived needs
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Note current Java is both lower precision AND lower performance than other languages
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