There are several common reasons why delays in collaboration occur.
Staying in the comfort zone. Some organizations, especially the large and established, develop a stagnant culture in which working without the drive to act faster becomes the norm for everyone. In such environment, collaboration pace does not stand up to the challenges of competition and customer needs.
Too much work. When we juggle too many tasks, the average speed with which we respond to each individual request slows down. Busy employees and managers delay collaboration when working in teams and become bottlenecks.
Misunderstood or unclear priorities. Other team members are often not aware of how important a particular task is for the team to move forward and by deprioritizing it on their todo list slow down the whole team.