If a "modal" dialog is opened in applet in brower, and
"setVisible(false)" is used to close the dialog, it will takes around
300ms to close it in JDK 6.0 update 14. However, it takes only around
15ms to close the dialog if we use JDK 5.0, or use non-modal dialog, or
using Plugin 1, or not running in browser.

 please see the attached file.