To make TSO/E response time more consistent, use the RTO parameter in SYS1.PARMLIB member IEAIPSxx. You may want to keep TSO/E response time from fluctuating if your system is used heavily during one part of the day, and used little during others. If you are installing TSO/E for the first time, you may want to reserve resources for the future to keep response time from declining noticeably as you add users. Note that you cannot use SYS1.PARMLIB member IEAIPSxx to improve response time in a heavily-loaded system, only to make response time more consistent. One possible drawback to using the RTO parameter is that it defines the minimum possible response time. The response time for TSO/E will never be faster than the value you specify. For more information about SYS1.PARMLIB member IEAIPSxx, see .