I would first compare the prconfig settings between your old and new environments. I saw a lot of Pega0037 in the alert log. Also make sure Oracle db stats are run for your new environments. There are several Pega0005 as well.
We had reran the stats in oracle db and tried to compare the prconfig files but pega 7 has a lot of additional things configured (mainly in the dynamic system settings) its make though for us to make exact comparison.
Do you have any specific attributes in mind you suggest us to check them.