6u18b03: 10% to 20% FX startup performance regression in javaws and plugins

javaws and plugin benchmarks (from startup2 refworkload benchmark) run with fx1.3b111(promoted build b07)
and jdk6u18b03 in "warm" mode (deployed cache is kept untouched) show from 10% to 20% regression
comparing to previous jdk6u18b01.

10% - 20% is about 100ms in average.

Here is the detailed comparison:

==============================================================================
6u18b01_fx1.3b07:
  Benchmark Samples Mean Stdev Geomean Weight
  app_animpath_jws 20 907.70 25.68
  app_fx_jws 20 511.60 30.03
  app_jmc_jws 20 724.15 10.52
  app_mediacenter_jws 20 1754.60 35.86
  app_swing_jws 20 547.60 14.68
  applet_animpath_jpi 20 1087.40 15.68
  applet_fx_jpi 20 722.00 32.91
  applet_jmc_jpi 20 1099.10 56.67
  applet_mediacenter_ 20 1978.85 16.25
  applet_swing_jpi 20 705.45 11.57
==============================================================================
6u18b03_fx1.3b07
  Benchmark Samples Mean Stdev %Diff P Significant
  app_animpath_jws 20 915.55 38.05 -0.86 0.450 *
  app_fx_jws 20 615.55 10.64 -20.32 0.000 Yes
  app_jmc_jws 20 801.40 21.65 -10.67 0.000 Yes
  app_mediacenter_jws 20 1851.50 33.02 -5.52 0.000 Yes
  app_swing_jws 20 614.75 9.13 -12.26 0.000 Yes
  applet_animpath_jpi 20 1147.60 47.09 -5.54 0.000 Yes
  applet_fx_jpi 20 790.60 12.75 -9.50 0.000 Yes
  applet_jmc_jpi 20 997.65 12.63 9.23 0.000 Yes
  applet_mediacenter_ 20 2030.55 12.86 -2.61 0.000 Yes
  applet_swing_jpi 20 794.65 12.82 -12.64 0.000 Yes
==============================================================================


The regression is observed in all benchmarks except applet_jmc_jpi and app_animpath_jws.
applet_jmc_jpi actually shows stable improvements.
app_animpath_jws looks like fluctuate too much, so hard to compare.

Please see also results here:
 http://spb-phare.russia.sun.com/compare?ids=16541,16581


I also tried to reproduce the regression using 2 simple benchmarks app_swing_jws and app_swing_jws
and the regression is easy reproduced:

==============================================================================
./6u18b01/results/: Benchmark Samples Mean Stdev Geomean Weight
  startup2 10 623.68 23.33
    app_swing_jws 10 556.30 42.39 0.50
    applet_swing_jpi 10 700.10 9.70 0.50
==============================================================================
./6u18b03/results/:
  Benchmark Samples Mean Stdev %Diff P Significant
  startup2 10 697.99 15.08 -11.92 0.000 Yes
    app_swing_jws 10 614.20 7.47 -10.41 0.002 Yes
    applet_swing_jpi 10 793.60 35.01 -13.36 0.000 Yes
==============================================================================


The similar regressions are observed in "coldapp" mode (application jars are purged from deployment cache) as well:
 http://spb-phare.russia.sun.com/compare?ids=16555,16584