Newbie question about Oracle 11G performance

I have a situation where a newer better faster server running Oracle 11gR1 is running considerably slower than an older slower server running Oracle 10gR2.
Both of these servers have the same web applications and same dumpfiles loaded into them.
I personally installed the Oracle 11g on the new server, however, I didn't install the 10gR2 on the older server, some one else did...
I have checked what I think are the basics: the tables are not missing constraints, the automatic memory management is enabled.
I know this is a really broad question.
Newer server:
Quad-Core AMD Opteron Processor 2352 2.10 GHz (2 processors)
16 GB memory
Windows Server 2008, 64 bit
Raid 5
Older Server:
Intel Xeon 1.8 GHz (2 processors)
4 GB memory
Windows Server 2003, 32 bit
Raid 5

Hi Derik,
I know this is a really broad question. No, it happens all the time! Here is a similar issue:
http://blog.tuningknife.com/2008/09/26/oracle-11g-performance-issue/
+"In the end, nothing I tried could dissuade 11g from emitting the “PARSING IN CURSOR #d+” message for each insert statement. I filed a service request with Oracle Support on this issue and they ultimately referred the issue to development as a bug. Note that Support couldn’t reproduce the slowness I was seeing, but their trace files did reflect the parsing messages I observed."+
I would:
1 - Start by examining historical SQL execution plans (stats$sql_plan or dba_hist_sql_plan). Try to isolate the exact nature of the decreased performance.
Are different indexes being used? Are you geting more full-table scans?
2 - Migrate-in your old 10g CBO statistics
3 - Confirm that all init.ora parms are identical
4 - Drill into each SQL with a different execution plan . . .
Raid 5 Don't believe that crap that all RAID-5 is evil. . . .
http://www.dba-oracle.com/t_raid5_acceptable_oracle.htm
But at the same time, consider using the Oracle standard, RAID-10 . . .
Hope this helps . . .
Donald K. Burleson
Oracle Press author
Author of "Oracle Tuning: The Definitive Reference"
http://www.rampant-books.com/t_oracle_tuning_book.htm
"Time flies like an arrow; Fruit flies like a banana".

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    Hi Derik,
    I know this is a really broad question. No, it happens all the time! Here is a similar issue:
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