Hi
I made some testing of conversion performance. As you can see Dirrect conversion works much faster that conversion using Aspose.Words+Aspose.Pdf.
Test #1 : Aspose.Words time = 1,71875 sec Aspose.Pdf time = 2,0625 sec
Test #2 : Aspose.Words time = 1,21875 sec Aspose.Pdf time = 3,609375 sec
Test #3 : Aspose.Words time = 1,140625 sec Aspose.Pdf time = 5,734375 sec
Test #4 : Aspose.Words time = 0,453125 sec Aspose.Pdf time = 2,734375 sec
Test #5 : Aspose.Words time = 0,59375 sec Aspose.Pdf time = 2,328125 sec
Test #6 : Aspose.Words time = 1,1875 sec Aspose.Pdf time = 3,375 sec
Test #7 : Aspose.Words time = 2,15625 sec Aspose.Pdf time = 4,4375 sec
Test #8 : Aspose.Words time = 1,765625 sec Aspose.Pdf time = 3,28125 sec
Test #9 : Aspose.Words time = 0,78125 sec Aspose.Pdf time = 6,671875 sec
Test #10 : Aspose.Words time = 0,265625 sec Aspose.Pdf time = 2,453125 sec
Test #11 : Aspose.Words time = 0,234375 sec Aspose.Pdf time = 2,546875 sec
Test #12 : Aspose.Words time = 2,109375 sec Aspose.Pdf time = 3,140625 sec
Test #13 : Aspose.Words time = 1,78125 sec Aspose.Pdf time = 6,3125 sec
Test #14 : Aspose.Words time = 0,203125 sec Aspose.Pdf time = 2,234375 sec
Test #15 : Aspose.Words time = 0,875 sec Aspose.Pdf time = 2,828125 sec
Test #16 : Aspose.Words time = 0,453125 sec Aspose.Pdf time = 2,390625 sec
Test #17 : Aspose.Words time = 2,859375 sec Aspose.Pdf time = 3,4375 sec
Test #18 : Aspose.Words time = 0,28125 sec Aspose.Pdf time = 2,34375 sec
Test #19 : Aspose.Words time = 1,328125 sec Aspose.Pdf time = 3,15625 sec
Test #20 : Aspose.Words time = 0,359375 sec Aspose.Pdf time = 2,421875 sec
However, if I understood you correctly, you would like to create PDF from scratch. You can try to create the same document using Aspose.Words and Aspose.Pdf and compare performance. If you need, I can help you to do that. If so, please tell me what kind of documents you need to generate, what document elements will be used, what size of document etc. Performance is closely related to the complexity of a document.
Best regards.