Grades view for 'active cards only'
Currently it is only possible to view grades for one single sub topic at a time which does not really give you a good idea of how you are progressing. Also it could take you a long time to view all your grades; if like me you have lots of topics and subtopics.
I think it would be useful to be able to see the grades of 'active cards only'. This way you can see how you are progressing on those cards which you are working on right now.
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Abakus commented
This idea is similar to your idea, because it is about visualizing the learning progress: http://mnemosyne.uservoice.com/forums/164265-general/suggestions/3592005-add-to-statistics-plugin-a-visualization-of-deck-g