5.0 RC: slower and uses more memory

Question

So far, I can't approve the promise of JDK 5.0 (RC): it is not only slower but also takes up more memory! Startup time is also the same compared to 1.4.2_05.
I tested with a server application running the same task several times in sequence. The task does a little JDBC access, some calculations and some heavy XML processing and FOP generating. I checked it twice but running the server with the 5.0 RC server HotSpot took considerably longer than with the 1.4.2_05 server HotSpot VM: 10 - 30 % longer!!! As I log memory usage after each task, the 5.0 test also showed slightly more memory used than the 1.4.2_05 version. (On Windows 2000 computer)
I wonder if this is a joke from Sun or if the RC is not optimized/has debug code enabled???

Answer 1

I hope that the final version could ship better optimized than the RC version - it's very slow even in a Pentium 4 machine. Is there any debug info left in jvm.dll anymore?
They even use Intel's VTune profiler (you can check such affirmation by reading J2SE SDK 1.4 SCSL Source code) but apparently they use the good old Microsoft Visual C++ 6.0 compiler, instead of using Intel's C++ 7.X Optimizing Compiler. (Use the following options for getting a hotspot.log file that gives you a lot of informations about compiling: java -XX:+UnlockDiagnosticVMOptions -XX:+LogCompilation ) The Intel's compiler could speed up the JIT compiler speed and the interpreted code speed. (Well, I never tried to compile SCSL code with Intel's C++ compiler and check my assertion...)
Excerpt from hotspot.log
<info>
Java HotSpot(TM) Client VM (1.5.0-rc-b63) for windows-x86, built on Aug 11 2004
03:18:38 by "java_re" with MS VC++ 6.0
</info>