I see that this has been reported quite a few times already, but there has been no response to the previous reports. Thrown Lingering Potions have clouds that do not dissipate after a certain amount of time like they are supposed to. A few were thrown on my Realms server to take care of an issue and it has been 3 hours. The clouds are still there, though it has no effect on players or mobs, though it IS causing framerate issues when in the vicinity of it, which is right in the center of town.