WDA - is there always a 1:1 ratio for # of WDA on EP portal to ECC sessions

Our portal developer has recently created and added 3 WDA (Web Dynpro for ABAP) which get loaded on the initial screen when the user signs on to EP.  These 3 new are in addition to the single application which they previously were using.
Review of the backend ECC system, we show that user now has 4 plugin HTTP sessions (vs. 1) which are reflective of the 3 new additional web dynpro's. 
From my basis perspective (not fully understanding opportunities for EP development, best practices and strategies) a single user generating 4 sessions in ECC seems a little excessive and I do not believe that we are going to be able to just absorb this additional demand for processing / memory.
Is this a common design to have so many sessions generated at inital signon? 
Realize that there's not a "right" and "wrong" here --- but looking for opportunities for a more creative solution other than purchasing hardware.
Regards & Thank you for your ideas
Doreen

Yes, in this case each session is itself a connection. Is there a reason you don't share the OCIEnv across them all? Are you sure it's the number of OCI connections that's the problem and not the implementation encapsulating them? Have you profiled this application to see if it's really OCI?
I only ask because I've seen many apps which use more than 5 concurrent connections.

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