While trading with a Cartographer to maximize trades the initial trade worked fine. When trying to trade emeralds for a map, once the trade was finalized the client FPS rate dropped to single digits. I've repeated this several times and waited 5-10 minutes multiple times but the rate drop has never ended.
This has not happened in any other trade progressions with other professions. Quitting and reentering the worlds solved the FPS problem, but the trade appears to not have been created. Re-attempting the trade after a restart and a reboot of the game results in the same impact.
Screen shots attached to show pre and post-trade F3 data
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