Actually, see the issue described here: https://stackoverflow.com/questions/38434300/why-is-quicksum-very-slow-in-scip-python-interface https://stackoverflow.co

Actually, see the issue described here: https://stackoverflow.com/questions/38434300/why-is-quicksum-very-slow-in-scip-python-interface https://stackoverflow.com/questions/38434300/why-is-quicksum... Using Python sum() is quite slow, so the packages provides a kind of lazy quicksum().