As you have mentioned above, the application takes a very long time to draw up/ update in the PDF.
Please try once to repair the application and check if it is updated to the latest version.
Launch the application and go to Help > Repair Installation or Check for updates.
Could you please let us know how exactly you add the draw up in the PDF?
Please share the exact workflow.
Did you check if the issue occurs with other PDFs as well or with this particular PDF?
What is the version of Acrobat XI currently installed on your Windows machine?
It is possible to share the PDF with us? If yes, share the file using the steps mentioned here How to share a file using Adobe Document Cloud.
We will be waiting for your response.