Building @silentwisperer Mob farm using signs to stop the water flow. Kills PS5 Gameplay with a silly loading bar that pops up just after placing a sign. It can take several minutes to place one sign. I managed to lose several hours wasting time placing signs and discovered that fence gates did a better job.
This is a single-player survival mode game on Bedrock. Not on a server.
See What I mean here:
https://youtu.be/ks0ngCtzY2I
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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Signs and banners are much more resource demanding than other blocks you could use to block water like buttons and fence gates because they have to check the tile entity nbt data to determine how to render. I would guess that this check is not optimized, e.g. the game could be reading the entire tile entity list for each sign the chunk on each tick. Chests have the same issue, which is tracked at MCPE-137537.