For queries executed in parallel mode, query time distribution for wait activities such as network I/O, disk I/O, or other wait conditions during the execution of the query are represented as a bar graph.
In this example, the red bars correspond to the amount of synchronization time spent for parallel execution structures, and the yellow bar represents other wait conditions, such as network I/O, disk I/O, and so on. The percentage indicates how much time is considered wait time in comparison with the CPU time that could have been used by all the threads active at that particular moment.
