Application running slow in ver 1.5, 1.6 but not in 1.4

We have a application that was running very slow when we used any version sun java instead of MS java in IE6 SP2.
I removed MS Java from IE and installed Sun java 1.4.2_16 and the applications starts in under 10sec's.
But we had to test the other version of java as well, i then installed the other versions from 1.5 update 14 to 1.6 update 4 and the application takes about 30 to 40 sec to load the web page.
I then looked at the development version of java 1.6 update 10 and version 7. In 1.6 update 10 the application would load but would not refresh the applets it would just hang. In version 7 the application would not start up at all.
In all the versions i increased the memory parmeters from 128 to 256 and in version 1.6 i changed it to -Xmx300m as well but still the application was slow loading. Removed all the versions and reinstalled 1.4.2_14 and the application works fine and loads up under 10 sec.
Does any one have any idea why this is happening.
IE 6 sp2
XP sp2 been used.

You should try profiling the startup code.
As a first go around, you might try getting a stack trace during the startup process and look for locks (see jstack).
If your application is built on Swing, it's my understanding that the later versions of Java are more strict about use of the Event Dispatch Thread--pay particular attention to activity off the EDT locking the thread.

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