The output area of the test pane is terribly slow:

Testing scenario: I created a code block setting VerbosePreference to "Continue" and then calling "import-module ConfigurationManager", that code is then run on a HybridWorker on premise. That import-module command produces about 900 lines of output (various import- and export messages)

Result:

- Without verbose messages it takes 2 seconds
- With verbose messages it take 8 minutes
- Opening the test pane (which shows the old test output) takes multiple minutes as well

I think there is some room for improvement here ...