I would have preferred to be able to allocate a certain number of cores to each project (some projects allow that) but it was not possible for enough projects unfortunately. The best way would be now to somehow compare cpu-time I guess. I would really like to write a program that extracts it from the task-pages of the projects, but I don't know where to even start unfortunately (chemistry-programming-lectures don't teach you how to extract information out of the internet...).

Edit: Concerning the point of doing one project at a time: I don't want to do that, as I would have to run each project for at least a few days, lets say 4. Doing that for 12 Projects takes 48 days. In that time the competition might have changed dramatically already and the comparison would suffer I guess.