Attached is the benchmark test program of JTable initialization:

Source code:
------------------------------------
import javax.swing.*;

public class JTableLoad {

     public static void main(String args[]) throws Exception {
long t1 = System.currentTimeMillis();
         new JTable();
long t2 = System.currentTimeMillis();
System.out.println("new JTable() time: "+(t2-t1));
System.out.println("Press Ctrl+C to end.");
System.in.read();

     }

}
-------------------------------------


Test comment:
Each test was run 11 times. First run was ignored to ensure the time is
not affected by swapping or disk I/O operations.

Test results:

Windows:

JVM 1.6b54
844,594,516,860,687,593,828,859,875,875ms
average: 753ms

JVM 1.5.0
437,422,438,422,422,438,422,437,422,437ms
average: 430ms

  Linux:

JVM 1.6b58
244,244,241,242,243,242,242,240,240,242ms
average: 242ms
JVM 1.5.0
206,205,207,195,207,207,206,205,208,205ms
average: 205ms


Test Observation:
1. On Windows there is high performance slowdown (about 75%) in loading
   Swing JTable in Mustang JVM.
2. Results on Windows are much worse then on Linux

Test Configuration:

Hardware: Mobile Pentium 4 2.66GHz, 512 MB RAM
OS1: Windows XP Professional
OS2: Fedora Linux 2
Customer exact system configuration:
Notebook Acer TravelMate 541LCi
Mobile Intel Pentium 4 - 2.66GHz, no Hyperthreading
512 MB RAM
40GB Ultra ATA/100 HDD
ATI Mobility Radeon 9200
Windows XP Proffesional, Service Pack 1, Czech Locale
Antivirus disabled
200 MB RAM occupied by system and applications

performed tests again with settings as suggested in
bug#6343888evaluation. Results are still the same:


1.6.0 b54

java -Xshare:on
687,734,672,672,688,687,735,781,672,672
average: 700


java -Xshare:off
656,750,781,875,859,859,718,766,844,766
average: 787


1.5.0_05

java -Xshare:off
453,438,438,438,438,437,437,438,453,438
average:440

java -Xshare:on
266,250,235,234,234,281,313,312,312,312
average:274


they are uniprocessor, without
 hyperthreading and multicore features.


more testing result with build57
===============================

performing the same test on another machine with Mustang build 57:

JDK 1.6.0: -Xshare:off
390,391,390, ... still the same numbers

JDK 1.6.0: -Xshare:on
328,344, ... still the same numbers

JDK 1.5.0: -Xshare:on
141,156,156,141,... still the same numbers


Machine configuration:
Dell Precision 360
Pentium 4 3GHz, Hyperthreading
Windows XP professional, Czech Locale
1 GB RAM