DO11: intermittent stall on folder opening

I'm afraid that this bug report is vague and hard to reproduce, but since upgrading to DO11, opening folders 'stalls' sometimes for a second or so. The interface freezes and then everything works as normal. Is anyone else experiencing something similar, before I go crazy trying to isolate the problem? I've been watching the beta notes, but don't see anything which corresponds.

Thanks
Jeremy

This guide may help: Crash, exit or high CPU when viewing certain directories