I've been using Zotero for a couple of years now in graduate studies, so have developed quite a database. The tool is amazing. However, I have been having a recurring problem for a while now. Whenever i first open Zotero, or add an item, or copy an item to another zotero folder, or whatever, my browser hangs for about 10-15 or so seconds, tying up my CPU in the process. Needless to say, that gets quite annoying, and dramatically reduces my willingness to use Zotero to do things. Is this problem common?