Hi Marcelo,
Although you can keep increase increasing the default agent clamps (introscope.agent.transactiontrace.componentCountClamp, introscope.agent.metricClamp) , EM clamps and probably split the load by adding more collectors to support the metric load
I suggest to review your agent configuration and try to reduce the agent configuration / instrumentation, do you really need all the metrics?
See:
Agent Deployment Guidelines - CA Application Performance Management - 10.7 - CA Technologies Documentation
apm-events-thresholds-config.xml - CA Application Performance Management - 10.7 - CA Technologies Documentation
I suggest you to review this KB, I have tried to compiled most of the common EM configuration issues causing performance issues.
Introscope Enterprise Manager Troubleshooting and - CA Knowledge
Finally, you are using an old release, we have made several enhancements to the server components, I strongly suggest you to consider to upgrade to the latest 10.7 build
I hope this helps,
Sergio