Java Applet weird performance behavior on the latest JRE (7.55+)

Question

We are using some kind of proprietary applet from our sign provider, which signs some XML. When we use the JRE 6u37, applets run without problems - it runs very quickly and never freezes. But when we upgrade the JRE to 7u55 or later, it often starts to freeze. Only help to reload the browser. Is there a way to fix this problem, maybe by some parameters or something else?

Here is the startup code:

<script>
    var attributes = {codebase:'#{request.contextPath}/distr',
                      code:'kz.softkey.iola.applet.MainApplet',
                      archive:'iolaApplet.jar',
                      type:'application/x-java-applet',
                      mayscript:'true',
                      id:'iolaApplet',
                      name:'iolaApplet',
                      width:1, height:1} ;
    var parameters = {code:'kz.softkey.iola.applet.MainApplet', 
                    codebase:'#{request.contextPath}/distr',
                    archive:'iolaApplet.jar',
                    cache_option:'Plugin',
                    cache_archive:'iolaApplet.jar',
                    mayscript:'true',
                    scriptable:'true',
                    fileExtension:'KEYSTORE',
                    cache_archive:'iolaApplet.jar',
                    java_arguments:'-Xmx300m',
                    writesoap:'false';
    var version = '1.6';
    deployJava.runApplet(attributes, parameters, version);
</script>

Answer 1

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