I am also getting some serious lag on the rendering in the library browser. I'm rendering about one problem every 2 minutes. However, If I click "Try it", the problem pops up instantly, though.
I tried tinkering with the settings in the above-mentioned file, but no success in improving the rendering times in the Homework Set Editor or the Library Browser.
Would you have any other recommendations to consider?
Thanks!
Mike Schroeder