Web Audio Evaluation Tool

When submitting the test in the end, there can be a lag (especially if it's remote) before the 'Thank you!' window appears to tell you the test was submitted successfully (or, if it didn't work, a link to the results XML file).
During this gap, there is no dialog window telling the user to hang on and keep the browser window open, which can lead to loss of data.
Instead, there should probably be a progress window, or hourglass-like animation/sign, or just a text window saying 'Submitting...'.