Lately I've noticed some pretty poor performance when using Studio in my sub-prod development instance. When selecting an app to edit it can take quite a long time to fully load, this morning was close to 3 minutes, and I don't recall performance ever being this bad.
One custom app is really bad in particular, which I don't understand since it's just a handful of tables, a couple application menus and modules along with the usual ACLs etc. In total though the app only shows 295 files, so it doesn't seem like there's all that much to load.
