You'll want to disable Sun Java in Internet Explorer and run your JAVA-based speed tests using IE. Unchecking the Sun Java box shown in the image below, will disable Sun Java in IE but leave it available for other applications.
To change your settings in Internet Explorer it's Tools => Internet Options => Advanced. Scroll down to find the Java settings. The Sun Java option will not be available if you do not have Sun Java installed.
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Credit goes to wpfranklin for the how-to.
Credit goes to Rfsjr2 for the FAQ submission.