OpenXML for template merge in Word

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I'm evaluating to see whether we can use OpenXML SDK for merging template with data. We are using Aspose Words third party solution and we observed it is slow for large documents. For a document of size 20 MB, Aspose takes around 1 sec to max 4 seconds but we observed Open XML takes 50 msec - 1 sec to fill a table with 3000 rows of data. I see the limitation of OpenXML is around TOC refresh and fields update. Let's say If the template don't have any TOC but only page number in footer then is it ok to use OpenXML?

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