Resolution:
RTView has been optimized in recent versions (4.5c1) so that it will have minimal impact on the EMS Server as it retrieves metrics.

For example, it requests only those metrics that are being displayed. The user can now set the metric query rate to be longer or shorter. The max number of topics and queues that are returned can also be set, in case the EMS Server contains tens of thousands of topics.

In short, there exist various parameters to tune the performance and behavior of the EMS Mgr application.

You can also read about these optimizations in the release notes.

We strongly recommend using version 4.5c1 or higher.  There have been a number of significant enhancements since 4.1 (such as SSL support, fault tolerance pairs, etc).