Hi

With SP 2013 new workflow architecture, lot of improvements were done to make it more scalable.

As we understand, scalabilty provides the following advantages -  better performance in terms of page rendering response time, ability to run more number of processes simultaneously, ability to run long running process, availability, ability to store several workflow instances .... , persistance ...

Please convince me how K2 is better than SP 2013 with respect to above factors and would also like to know at hight level how the architecture of K2 differs from that of SP 2013 with focus on scalability, complexity and performance.