With TestRunner enabled in the CodeRush options, if you have NUnit tests that make use of Combinatorial / Pairwise testing then Visual Studio becomes really slow to respond a lot of the time, and more often than not it is completely unresponsive.
Disabling TestRunner fixes this issue.
Have the TestRunner window open or closed does not appear to make any difference.
My guess is that CodeRush is still compiling the list of all possible tests that could be carried out, and in some cases our unit tests are generating 100s and 1000s of possible combinations.
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