Digital Signatures in Adobe PDF with Adobe SDK

Question

Hi,
Please, apologyze my poor english.
I have an  application that inserts a signature programmatically in a PDF document  with Acrobat 8, via VB .NET, using the example provided in the Acrobat 8  SDK ("AddSignature").
The difference between the SDK example and this code resides only in the way of calling the script in .net
I  call directly the AddSignature function with this code (partial),  instead of calling the execution of the "ADBESDK:AddSignature" menu  (this improves faster execution with no AVDOC object involved):
        AcroExchPDDoc = New Acrobat.AcroPDDoc
        Dim JsObj As New Object
        AcroExchPDDoc.Open("c:\test.pdf")
        JsObj = AcroExchPDDoc.GetJSObject
        JsObj.SetUserDigitalIDPath("/C/trabajo/DrTest.pfx")
        JsObj.SetUserPassword("testpassword")
        JsObj.AddSignature(JsObj)
        JsOb = Nothing
        AcroExchPDDoc.Save(1, "c:\result_test.pdf")
        AcroExchPDDoc.Close()
I notice that the more signatures the PDF already contains at the time of inserting a new signature, the more is the time it cost to the program to execute the "AddSignature" line. I've configurated Adobe Acrobat to not validate signatures on open, so I guess validation of existing signatures is not the cause of this delay.
Can someone tell me something about this ??

Answer 1

Well, surely a larer filesize could be the cause of incresing time but, in this particular case we are talking of PDFs about 150kb each.
With 3 or 4 signatures already, they have about 180kb so i guess the increase in filesize can´t be the origin (especially with a PC above the average). Anyway, i´m not sure...
Does someone have any other idea about this?