Java and Liveconnect - init problem

Hi all,

The facts : a rich text editing applet, a HTML/Javascript toolbar and  
Liveconnect to make them communicate alltogether.
  - Java to JS communication (for updating the state of the toolbar - text  
align, style, color) is OK
  - JS to Java communication (for changing text align, style, color)  
doesn't work as expected :
The first call of a Java method is DAMN SLOW (near 20 minutes !)
Here is the output of the Java console (the following message is displayed  
more than a thousand times) :

liveconnect: JavaScript: calling Java system code
liveconnect: JavaScript: default security policy = file://

Note that under Opera there is another problem (exception throwed), but  
under IE and Konqueror, it seems OK

Thank you for your answers and advices