My numbers above were way above normal .. had to do a re-install. That being said the product and infrastructure are painfully slow compared to anything .. esp compared to 10g. We have never moved to prod with oem 12c. We are now blowing away the R2 and installed the new R3. The performance is the same .. pathetic. Its just trying to do too much. You notice that Oracle folks dont want to use it either? They always say to use the emcli (?) whatever the command line program is. The SRs confirmed it wasnt the db response time .. it was something in between.
Nothing to look at after another 2 month SR .. and the oracle rep .. said sorry i need to close this ticket and assign to another group I deleted OEM 12cR2 ... i have installed R3 .. but only have 1 exadata target installed. Still slow and painful to use.. we wont be moving to it unless we have to (ie Exadata)
I spent a couple months with Oracle Support on a similar issue. They did not provide me with a solution but here is what I was able to do. Run the sql query in my blog and see how long it takes. If this is your issue as well, try the solution. I hope this helps!