Narrative reporting/EPRCS performance and capacity question

Summary:

Need some information on EPRCS performance and capacity

Content (required):

We have an EPRCS instance where we have circa 200 users who work on around 250 reports. For a new use case we are adding 100 more users who will be working on 2 new reports each with around 400 pages.

We would like to know if addition of these users would create any performance issues in EPRCS if all users are accessing the system during peak period.

In case of any issues, what will be Oracle's response. Is there any automatic capacity increase which will be done within the instance or we need to request for capacity increase via SR?