You may be able to reduce the number of 'application is busy' messages, you can add the statement tersus.queueEventDelay = 60000; to settings.js in the web folder. However, drag and drop may remain jumpy.
Please let us know if it helps.
Regading "Convert Number to Text': Since we're using Java formats, we depend on Java. The idea of the Java applet is to eliminate the need to go to the server for such conversions (eliminating the need to GET the formatted numbers from the server, which is what the action does if Java is not enabled).
For best results, use the Firefox browser..