I also found that further development on SageMathCloud was becoming too slow and frustrating for me, even though I knew the system extremely well (certain impor

I also found that further development on SageMathCloud was becoming too slow and frustrating for me, even though I knew the system extremely well (certain important things turned out to be very hard using the original approach). In order to implement the features a lot of users demanded, it was necessary to use a better approach. It is starting to pay off.