When I open Acrobat DC it takes a few seconds extra I guess to connect to Adobe licensing server to load creative cloud profile and verify license vc the icon in the upper right is blank for a bit - causing a slowdown / freezing of the program. See picture 1 (left).
More annoying is about a 30 second lag literally every time I open a new PDF file even if I leave DC open and its opening in a new tab. It is really annoying and similar to what this user is experiencing - here. Kind of renders the whole thing useless. There is nothing wrong with my software or my computer - my computer is a brand new top of the line Dell Precision 7560 Workstation. I uninstalled DC and reinstalled it, everything worked normally - until it installed the updates - and now I am back to square one and I am getting very upset. Adobe needs to fix this thing.
Would you mind sharing the version of the Adobe Acrobat DC you are using? To check the version go to Help > About Acrobat and make sure you have the recent version 22.1.20117 installed. Go to Help > Check for updates and reboot the computer once.
Also, try to repair the installation from the help menu and reboot the computer, and check.
Is this an issue with a particular PDF file or with all the PDFs that you try to open? 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 to open it and check.
Also, go to Edit > Preferences > Enhanced Security > Uncheck 'Enable protected mode at startup' turn off the protected mode and uncheck 'Enhanced Security > Click OK and reboot the computer once. Note: Please turn on the security after testing to avoid any security risk.