I was bothered by this annoying feature and found that if I followed the below listed steps adobe reader x opens files faster.
Open the reader, select Edit, Preferences then select Internet from the Categories. This should display the Web browser options page, untick "Allow speculative downloading in the background". This increased the speed of opening pdfs for me hope it helps.
I tried this, but it doesn't seem to work. Reader is still very slow opening documents. Any other suggestions?
I have this problem too and I have since long suspected the sandbox to be the culprit. It wasn't until today that I started Googling it though. I first found this forum and now I think I have found the solution here:
"Go to Edit / preferences / general - then uncheck box 'Enable protected mode at startup' This got rid of the lag in opening adobe docs."
I'm trying this out now! Even though it will kill what little security Adobe has created I cannot stand the lag anymore.
Actually, I'm finding that documents open more quickly now. It must be that I needed to restart Reader for the change to take effect. So the solution above does work--at least for me.
Yes turning off protected mode helped for me too! It's very fast now
I cannot recommend Foxit Reader if you have carefully placed icons on your desktop as Foxit will completely mess them up whenever you install or upgrade it. A lot of their users have also left them after they released the latest redesigned version. The only viable option to Adobe Reader today is Sumatra PDF but for some reason I still stick with Adobe on my work desktop.
I have deleted the earlier 1-time posters suggestion to use foxit reader.
It is well-known that this particular PDF viewer installs spyware on users computers.