OnLine 7.13 performance problems - comments please?

We're running OnLine 7.13 under Solaris 2.4, on a Sparc 20 with 160M of memory. The load is increasing, and the users are complaining about performance. Here's my onstat -p in the 12 hours since I zeroed the stats: Profile dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached 1581705 2954933 454881229 99.65 105177 221459 827392 87.29 isamtot open start read write rewrite delete commit rollbk 301750703 34728791 54605347 158736271 67734 66525 88369 22019 712 ovlock ovuserthread ovbuff usercpu syscpu numckpts flushes 0 0 0 45736.59 1212.92 73 146 bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress seqscans 166771 2568 872540367 0 0 137 6094 2058386 ixda-RA idx-RA da-RA RA-pgsused lchwaits 806840 188 397745 1204459 1016 ..... and here are selected highlights of my onconfig file. My explanation to the users is that the machine, which consistently shows 0% idle CPU, is simply overwhelmed by the application (which is bought-in, so we can't tune it). Any other comments, suggestions or opinions would be gratefully received. Thanks Neil ROOTNAME rootdbs # Root dbspace name ROOTPATH /dev/rdsk/informix_1 ROOTOFFSET 0 # Offset of root dbspace into device (Kbytes) ROOTSIZE 15000 # Size of root dbspace (Kbytes) MIRROR 0 # Mirroring flag (Yes = 1, No = 0) MIRRORPATH # Path for device containing mirroredroot MIRROROFFSET 0 # Offset into mirrored device (Kbytes) PHYSDBS logdbs # Location (dbspace) of physical log PHYSFILE 14750 # Physical log file size (Kbytes) LOGFILES 10 # Number of logical log files LOGSIZE 5950 # Logical log size (Kbytes) SERVERNUM 2 # Unique id corresponding to a OnLineinstance DBSERVERNAME trafic2_online # Name of default database server DBSERVERALIASES trafic2_shm # List of alternate dbservernames DEADLOCK_TIMEOUT 60 # Max time to wait of lock indistributed env. RESIDENT 1 # Forced residency flag (Yes = 1, No = 0) MULTIPROCESSOR 1 # 0 for single-processor, 1 formulti-processor NUMCPUVPS 1 # Number of user (cpu) vps SINGLE_CPU_VP 1 # If non-zero, limit number of cpu vpsto one NOAGE 1 # Process aging AFF_SPROC 0 # Affinity start processor AFF_NPROCS 0 # Affinity number of processors LOCKS 20000 # Maximum number of locks BUFFERS 20000 # Maximum number of shared buffers NUMAIOVPS 1 # Number of IO vps PHYSBUFF 32 # Physical log buffer size (Kbytes) LOGBUFF 32 # Logical log buffer size (Kbytes)LOGSMAX 60 # Maximum number of logical log files CLEANERS 8 # Number of buffer cleaner processes SHMBASE 0xa000000 # Shared memory base address SHMVIRTSIZE 24756 # initial virtual shared memory segmentsize SHMADD 8192 # Size of new shared memory segments (Kbytes) SHMTOTAL 0 # Total shared memory (Kbytes). 0=>unlimited CKPTINTVL 900 # Check point interval (in sec) LRUS 4 # Number of LRU queues LRU_MAX_DIRTY 20 # LRU percent dirty begin cleaning limit LRU_MIN_DIRTY 10 # LRU percent dirty end cleaning limit LTXHWM 50 # Long transaction high water markpercentage LTXEHWM 60 # Long transaction high water mark (exclusive) TXTIMEOUT 0x12c # Transaction timeout (in sec) STACKSIZE 32 # Stack size (Kbytes) RA_PAGES # Number of pages to attempt to readahead RA_THRESHOLD # Number of pages left before next group DBSPACETEMP tempdbs # Default temp dbspaces FILLFACTOR 90 # Fill factor for building indexes PDQPRIORITY 0 # Degree of parallelism: 0 ... 100, MAX_PDQPRIORITY 100 # Maximum allowed pdqpriority DS_MAX_QUERIES # Maximum number of decision supportqueries DS_TOTAL_MEMORY # Decision support memory (Kbytes) DS_MAX_SCANS 1048576 # Maximum number of decision supportscans DATASKIP off # List of dbspaces to skip OPTCOMPIND 0 # To hint the optimizer