Increasing memory for resource pools can increase query concurrency that is under admission control.
Impala admission control controls the number of concurrent queries running on the Impala service at any time. If the time difference between the query being queued and when the admission completes is high, then revisit the total memory allocated to that pool:
Queued: 127ms (127000586) Completed admission: 3.50s (3498016148)
By increasing the memory, more queries can be run concurrently as long as the total concurrency is within the limits as recommended in Admission Control.