Thanks for reaching out to us for your concerns.
I would request you to kindly update to the latest available version of Adobe Acrobat DC using “Check for updates”
Also please send a screen recording video of the issue that you are facing to us at firstname.lastname@example.org
Ayush JainAnonymous commented
I am having the same issue with the windows resize handles. Scrolling a pdf is fast but for some reason when I change the windows size using any of the window handles there is extreme levels of lag. Something is programmed wrong.