Slow Text Blob updates

I have a table with a text field in it that is stored in the table the LOGBUFF and PHYSBUFF are both set to 64KB. I am on aix 64bit Informix 9.4 FC7 and update stats run nightly. My problem is that when updating the same text object that is larger that 35KB it takes about 30 seconds for the update statement to complete. I was wondering if increasing the LOGBUFF or PHYSBUFF would decrease completion time for the update. I have configured 4GB of log space in an unbuffered database. Following is my onconfig. Any Help would be greatly appreciated ifx1 $ onstat -c IBM Informix Dynamic Server Version 9.40.FC7 -- On-Line -- Up 3 days 11:37:15 -- 8829136 Kbytes Configuration File: /Medic/APPS/Informix94/etc/onconfig.ifx1 #************************************************************************** ## Licensed Material - Property Of IBM # # "Restricted Materials of IBM" # # IBM Informix Dynamic Server # (c) Copyright IBM Corporation 1996, 2004 All rights reserved. # # Title: onconfig.ifx1 # Description: IBM Informix Dynamic Server Configuration Parameters # #************************************************************************** # Root Dbspace Configuration ROOTNAME rootdbs # Root dbspace name ROOTPATH /Medic/db/ifx1/rootdbs # Path for device containing root dbspace ROOTOFFSET 4 # Offset of root dbspace into device (Kbytes) ROOTSIZE 2064380 # Size of root dbspace (Kbytes) # Disk Mirroring Configuration Parameters MIRROR 0 # Mirroring flag (Yes = 1, No = 0) MIRRORPATH # Path for device containing mirroredroot MIRROROFFSET 0 # Offset into mirrored device (Kbytes) # Physical Log Configuration PHYSDBS physlog # Location (dbspace) of physical log PHYSFILE 128414 # Physical log file size (Kbytes) # Logical Log Configuration LOGFILES 103 # Number of logical log files LOGSIZE 20000 # Logical log size (Kbytes) # Diagnostics MSGPATH /Medic/db/ifx1/informix.log # System message log file path CONSOLE /Medic/db/ifx1/console.log # System console message path # To automatically backup logical logs, edit alarmprogram.sh and set # BACKUPLOGS=Y ALARMPROGRAM /Medic/APPS/Informix94/etc/alarmprogram.sh # Alarm program path TBLSPACE_STATS 1 # Maintain tblspace statistics # System Archive Tape Device TAPEDEV /dev/rmt0.1 # Tape device path TAPEBLK 256 # Tape block size (Kbytes) TAPESIZE 195000000 # Maximum amount of data to put on tape (Kbytes) # Log Archive Tape Device LTAPEDEV /dev/null # Log tape device path LTAPEBLK 1024 # Log tape block size (Kbytes) LTAPESIZE 8900000 # Max amount of data to put on log tape (Kbytes) # Optical STAGEBLOB # Informix Dynamic Server staging area # System Configuration SERVERNUM 1 # Unique id corresponding to a OnLineinstance DBSERVERNAME ifx1 # Name of default database server DBSERVERALIASES ifx1_tcp1 # List of alternate dbservernames NETTYPE soctcp,5,200,CPU DEADLOCK_TIMEOUT 60 # Max time to wait of lock indistributed env. RESIDENT 0 # Forced residency flag (Yes = 1, No = 0) MULTIPROCESSOR 1 # 0 for single-processor, 1 for multi-processor NUMCPUVPS 16 # Number of user (cpu) vps SINGLE_CPU_VP 0 # 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 # Shared Memory Parameters LOCKS 1000000 # Maximum number of locks#BUFFERS 528000 # Maximum number of shared buffers BUFFERS 640000 # Maximum number of shared buffers NUMAIOVPS 1 # Number of IO vps PHYSBUFF 128 # Physical log buffer size (Kbytes) LOGBUFF 64 # Logical log buffer size (Kbytes) CLEANERS 128 # Number of buffer cleaner processes SHMBASE 0x700000010000000 SHMVIRTSIZE 5242880 # initial virtual shared memorysegment size SHMADD 262144 # Size of new shared memory segments (Kbytes) SHMTOTAL 0 # Total shared memory (Kbytes). 0=>unlimited CKPTINTVL 600 # Check point interval (in sec) LRUS 128 # Number of LRU queues LRU_MAX_DIRTY 2.000000 # LRU percent dirty begin cleaninglimit LRU_MIN_DIRTY 1.000000 # LRU percent dirty end cleaninglimit TXTIMEOUT 0x12c # Transaction timeout (in sec) STACKSIZE 256 # Dynamic Logging # DYNAMIC_LOGS: # 2 : server automatically add a new logical log when necessary. (ON) # 1 : notify DBA to add new logical logs when necessary. (ON) # 0 : cannot add logical log on the fly. (OFF) # # When dynamic logging is on, we can have higher values for LTXHWM/ LTXEHWM, # because the server can add new logical logs during long transaction rollback. # However, to limit the number of new logical logs being added, LTXHWM/ LTXEHWM# can be set to smaller values. # # If dynamic logging is off, LTXHWM/LTXEHWM need to be set to smaller values # to avoid long transaction rollback hanging the server due to lack of logical # log space, i.e. 50/60 or lower. DYNAMIC_LOGS 2 LTXHWM 50 LTXEHWM 60 # System Page Size # BUFFSIZE - OnLine no longer supports this configuration parameter. # To determine the page size used by OnLine on your platform # see the last line of output from the command, 'onstat - b'. # Recovery Variables # OFF_RECVRY_THREADS: # Number of parallel worker threads during fast recovery or an offline restore. # ON_RECVRY_THREADS: # Number of parallel worker threads during an online restore. OFF_RECVRY_THREADS 10 # Default number of offline workerthreads ON_RECVRY_THREADS 1 # Default number of online workerthreads # Data Replication Variables DRINTERVAL 30 # DR max time between DR buffer flushes (in sec) DRTIMEOUT 30 # DR network timeout (in sec) DRLOSTFOUND /Medic/APPS/Informix94/etc/dr.lostfound # DR lost+found file path # CDR Variables CDR_EVALTHREADS 1,2 # evaluator threads (per-cpu- vp,additional) CDR_DSLOCKWAIT 5 # DS lockwait timeout (seconds) CDR_QUEUEMEM 4096 # Maximum amount of memory for any CDR queue (Kbytes) CDR_NIFCOMPRESS 0 # Link level compression (-1 never, 0 none, 9 max) CDR_SERIAL 0,0 # Serial Column Sequence CDR_