I’m sorry to inform you that currently Aspose.Pdf.Kit only allows you to convert a PDF to XPS using an XPS printer; however, we have already logged a new feature request as PDFKITNET-14137 in our issue tracking system to provide a self-contained PDF to XPS converter in Aspose.Pdf.Kit. You’ll be updated via this forum thread once it is supported in future.
As far as decoding PDF page to image is concerned, Aspose.Pdf.Kit allows you to decode pages at a rate of 2 seconds per page. However, due to the complexity of the structure of the document this might be a little higher. Nevertheless, if you think the conversion time is too high then please share some sample PDF file so we could test it at our end and provide you the resolution.
We’re sorry for the inconvenience.