I have never had such problems with the preformence of Adobe, this is a waste of money. I am constenly needing to reboot because program not responding and for sluggish. I can't beleive my company is paying for this piece of s***
Is this an issue with a particular PDF file or with all the PDFs? Please try with a different PDF file and check. If the file is stored on a shared network/drive please download it to your computer locally and then try again.
What is the version of the Acrobat DC you are using? To check the version go to Help > About Acrobat and make sure you have the recent version 22.3.20281 (Mac) or 22.3.20282 (Win) installed. Go to Help > Check for updates and reboot the computer once.
Also, try to repair the installation from the help menu (Win Only) and see if that works.