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Yes the Image Accelerator is critical for image performance on 9.2 Refer to Metalink note 277612.1 for information on how to determine if you are running with the accelerator (or NCOMP as it is often called) installed.
If you find that your are running without the NCOMP libraries, then you will need to install the accelerator libraries from the companion CD of the base 9.2 release (188.8.131.52). Then you will need to re-patch the database back up to 184.108.40.206, your current patch level. The re-install of the patches will apply the patch updates for the NCOMP components. These components would not be patched if they did not exist in the original database.
Finally, have you read the documentation on tuning LOB performance? This is Chapter 11 of the Oracle interMedia User's Guide for 9.2.
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