Use a member rule type system throttle to limit the concurrent requests of users with the same account or profile. This prevents a single user from unfairly dominating a workload, forcing other users to the delay queue.
Teradata recommends that you use a member type system throttle in conjunction with a workload throttle to ensure fairness. For example, create a system member throttle on Profile AcctUsers that is set to 1. Set the workload throttle for AcctUsers profile to 5. Then the AcctUsers workload is allowed 5 concurrent request (due to the workload throttle), but each user mapped to the AcctUsers profile may submit only 1 request (due to the system member throttle).