A comparison of async to qryq when specifying a compound query that is diamond-shaped.
Why diamond shaped? The diamond dependency problem is a not-so-simple problem to solve, and so I have chosen this as a litmus test for testing and demonstrating compound queries. Call it a SSCCE.
In the code snippet that I have linked above, the compound query where each of the queries is dependent upon the others in the shape of a diamond is used to as a point of comparison using a known-to-be-tricky problem.