When updating metadata on a large PSD file, Bridge "locks" up for a brief period of time. This is apparently when it's rewriting that large PSD file to update the metadata. I'd like to be able to use Bridge in an uninterrupted fashion while metadata is updated in the background. This normally works for smaller files, just not on large PSD files. You can reproduce this easily by just adding a keyword to a couple 100MB PSD files.