do you have any more info on that folder, such as how many files it contains (inclulding any subfolders?)
and are there any exe files in there too
and is there an active virus scanner running?
i’ve seen that happen on windows 7 with a normal c: drive before, usually within the Desktop structure of the user.
it’s not always the case, but at least 50% of the time i see the same thing, even without a drobo.
have you modified any of the “detail columns” in explorer, such as adding different “date” related columns?
A few things could be happening. First suspicion is what Paul mentioned - a virus scanner kicking off. Anything that suddenly puts a lot of requests to the Drobo will slow it down substantially. The second that comes to mind is if the drive isn’t already mapped or otherwise connected, then you’ll see a small delay as the user authenticates for the first time. But 30 seconds would be really excessive.