Summary

The SDAM Connection Pool Backpressure prose test prescribes $where: sleep(2000), making the test's runtime a function of server-side JS sleep() performance, slow under contention on 9.0 (SERVER-134156): 30–44s vs 15–17s on other versions, failing drivers that bound completion time (HELP-100331, mongo-java-driver#2062). The sleep only needs to hold connections busy long enough to force checkout contention. Propose reducing it (100–500ms).