Print dialogue slow to come up Terminal Server 2012 R2

Hello,

Our company is using Adobe Acrobat Reader DC (newest version) with a Terminal server Windows Server 2012 R2 to print PDF's. For a while we have the problem that the print dialogue opens after roughly 8 seconds (this should be 1-2 seconds) after clicking "print".

We know for sure that the printers are all on the right network and can be found, there is no problem there.

We have tried whitelisting the filepath in the security(advanced) tab, this didn't work.

In other applications, like Word, this works flawless.

Is there anything we could try to speed up the print dialogue?

Thank you in advance,

Ramon