Signing PDF takes long time


We are starting to implement Client Certificates for Digitally signing PDF's. But the signing process hangs for about a minute (without cpu load). Without signing the PDF, is created and opened in reader in a second.
How can we improve signing speed?
We tested version 2.1.2 and v 3.5.1 free.

regards. John


signing doesn't usually take this long, I can't really tell what is causing this.
Could it be a connection issue with the time server?
You could try using PDFCreator Business, as this uses a different library for certificates.

Best regards


Hi Robin,
There is a problem with the Sectigo CPAC client certificates. I do not know yet what's wrong with it, but signing with Sectigo Client Certificate takes 1-2 mintues. My older, but nog yet expired, Startcom client certificate works flawlessly and signs within a second. Both Certs are SHA256, But Startcom is RIP, so I needed a new Cert provider.
I post an update when I hear a possible solution from Sectigo or the Reseller. For now, it clear that Sectigo CPAC certificates (basic and enterprise) are problematic at least.

Best Regards,

It still takes too long. How to fix it?