If I select all five factors for more than 3 or so campaigns of a few thousand names apiece, I get the spinning pizza of death and the graph and table never shows up. We're only up to our 7th campaign now, and I'd like to see all of them together. Maybe you need to move the comparison feature to its own server?
Thanks for the heads up. I just did some testing and generated comparison reports on 30-40 campaigns with hundreds of thousands of recipients without any speed issues. This might be something specific to your account, so your best bet would be to get in touch with the support team so we can try and replicate it for you, then get to the bottom of it.