Bradleys not arriving is normally a plugin conflict, such as Signal Cooldown plugin or other similar.
Lag, hard to pin point, but as you say its normal when you unload it would suggest Bradley Drops as the issue, unless again its a conflict. That error in the console itself wouldn't cause lag.
The new version is nearly ready for a release, but the AI isn't re-worked yet, everything else is done. I had thought about releasing it as is and then release an AI update soon after. It should at least fix a few bugs that are being reported. I will have to make a decision.