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I've also lost a lot of FPS with 20w22a. Here are the screenshots of F3 in 20w21a, 20w22a and 20w22a with the recommended resource pack (which helps a tiny bit)
My graphics card is NVIDIA GeForce GTX 860M

Also, this bug has little relevance from the End Dimension. I was never in the End for months. It’s a superflat creative world in which I rarely leave the overworld. 1.13 has not fixed this for Xbox one at least.

Can confirm that Xbox One is still having this issue as well. Please fix. I would attach a world using one drive but every attempt I’ve made in the past was a failure. If someone could send a little more instruction how to get the right link in, I can send in a world that has been having this issue since late June 2019.

If it’s any note as well, the bug appeared again today after last night switching back to 1.12 to play on a separate multiplayer world, and this morning switching to 1.13.0.2 to get back on the world currently having the issue.

Also occurs on Bedrock beta 1.13.0.2. Similar bug seems to occur every update - was apparent during beta 1.11, and beta 1.9. Not sure if it has to do with size of the world, but the world fills up about 5 Legacy Console sized maps worth of builds on a superflat world - probably a couple hundred megabytes. Green bar fills up about 3/4 of the way and then after 30 seconds the game crashes. I know the world isn’t corrupted, because this has happened and been fixed twice before. Would very much appreciate a fix soon - hopefully before 1.13 releases in a couple months.