For example, if navigating to a folder named 'Alex Heer' and typing in 'A' and then 'L' we would expect it to very quickly skip straight to the first file or folder beginning with 'AL'. With this issue, it was noticeably slow when typing file/folder names sometimes skipping to the first folder beginning with 'A' and then the first folder beginning with 'L' (quite annoying). Although the delay may have only been around one second or less, it was noticeable to our users and gave out the impression that the system in general was slow.
- The issue was affecting all users on those servers
- It was only affecting the dialogs in MS Office. Windows Explorer, Notepad and other applications such as Adobe Reader were performing as expected.
- The delays were occuring when using the MS Office dialogs to browse to both network drives and local drives.
- It only occured when using the 'details' view, in particular the 'Date Created' and 'Date Modified' columns.
When troubleshooting, we quickly ruled out any RAM/CPU, Hyper-V host, storage, network, Windows or Office Update issue.
We eventually discovered that the issue was in fact with our anti-virus software, in particular McAfee VirusScan 8.8 Patch 5.
If we disabled the On Access Scanning (OAS) the issue was immediatley resolved.
We spoke to McAfee Support who said there is a known issue "affecting system performance" with Patch 5 and would be resolved in Patch 6 (altough it wasn't listed in the 'known issues' page).
You will need to make a decision whether to uninstall patch 5, or see if through until the new patch 6 is released (due August 2015).