It takes long time to open 2nd PDF

[Sharad_Shukla2146]

Just recently (about a week ago) one of our client started having issue with PDF. When they open 1st PDF, it opens immidentaly but, as soon as they start opening new 2nd, 3rd and many more adobe takes a long time to open the file.

Not sure, if its the new update but, I tried installing latest version and then disabled the new version to get back to old version. Steps I have taken are disabling Enhanced security and Use page cache.

Please help!!