Thanks for your inquiry.
Please note that document conversion time or performance also depends on document content. For example, if you have two documents of 20MB with different contents. Document A has more clip arts, images, tables, charts or other graphical elements and B has less. B will be converted quickly as compare to A. Aside this, we’d recommend you to utilize latest version 17.11 of the API in your project and see if it improves your document conversion experience. Moreover, we’ve logged your issue (document conversion improvement required) in our internal issue tracking system with ID:CONVERSIONNET-2268. As we get any udpate from the concerned team, we’ll notify you.