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Same OS or not?
Did you check
Things to Consider Before Upgrading to 220.127.116.11 to Avoid Poor Performance or Wrong Results [ID 1392633.1]
Slow Performance in Pick Release After Upgrade to RDBMS 18.104.22.168 (11gr2) [ID 1087099.1]
What do the AWR reports look like for the time when you are experiencing slowness?
There is also a new [url http://www.ora00600.com/scripts/11g/10g-to-11g-upgrade.html]resource manager plan in 11g which caused me issues after upgrading from 10g to 11g.
We'll need more details to see exactly what is slow.
Pl also see
Things to Consider Before Upgrading to 22.214.171.124 to Avoid Poor Performance or Wrong Results [ID 1320966.1]
TROUBLESHOOTING: Server Upgrade Results in Slow Query Performance [ID 160089.1]
Query Performance Degradation - Upgrade Related - Recommended Actions [ID 745216.1]
Did you save your stats prior to the upgrade? If so, try importing your '10g' stats and see if that helps...