7.20 performance.

I have recently upgraded to 7.20.UC2 from 5.07.UC1 on my SPARC 20 (single processor) running SOLARIS 2.5.1, and the first performance-tests I made is really bothering me. When doing very simple tasks as pure INSERTS, UPDATES and SELECTS from indexed tables i get a better performance from my 5.07 than from the 7.20. In some SPL run through DBACCESS i get about 30% better juice from 5.07. Doing the same operations in ESQL/C takes about twice the amount of time in 5.07, which is acceptable concerning the flow of data between the sqlturbo-process and the ESQL/C program. The same operations using ESQL/C-7.20 takes about six(6) times longer than using SPL-7.20, which still is slower than 5.07. All in all, ESQL/C seems to be more than twice as fast on 5.07 than on 7.20, and pure raw performance about 30 % better. The OS is configured according to the parameters in /usr/informix/release and when using onperf and dbcockpit, I can't see anything else than what You might expect. Has anyone experienced something like it ?? Is this a known problem, or have I not been able to configure 7.20 correctly (there are not that many parameters to fiddle with on a simple application like this) ?? /erik