Informix Runnin Slow on FC60 After upgrading to 11i

[Geever]

Configuration:

L2000 /2GB /Informix 7.3 - FC60

I have noticed that after upgrading the L2000 server from UX11 to 11i the performence has degraded, and the tasks taked 1.5hrs is now running for 10-12 hrs. The Kernel parameters are set for the same/ more of the previous config. Patched the system June 2001

There is a noticeable I/O activity happening for longer time, unlike before. We are not using Async disc for Raw I/O. ( It was disabled on 11 as well)

Does any one come across such issues ?