It sounds like you need to clean house. Go through and export and delete the ones you don't use. Then select the remainders and export them as one big obp file library. Exit/quit Bryce. Go into the Bryce folder and delete the obp file user library. Restart Bryce. Go to the user file and reimport that master obp file you created. That will bring back Bryce's performance. Then if you do need one of the others that you didn't keep, you can reimport it later.