There is an FPS drop when crossing chunk borders. I go from around 250 FPS to 10
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Lag spikes upon crossing a chunk border can happen for a vast number of reasons, there isn't really any information to go off of here. Can you refer to the mod-notice on MC-166005 and see if anything there matches your scenario?

Thanks Jiingy. I've uploaded the files from an F3 debug. Are you able to glean anything from them? If there's anything that leaps out at you that needs changing I'd be grateful to hear it.
I am personally unable to gleam the cause of the issue from the debug log but thank you for providing it.
What would be very helpful, are some steps to try and reproduce this issue. This could be steps to reproduce, a video, screenshots, or just generally more information on the specifics of how this issue arises. (as it has many reasons it can happen)

Thanks, Jiingy, I've just attached a 30 second screenshot mp4 file, like you suggested.
Your FPS never appears to go to 10 in that video

Thank you for your report!
We're tracking this issue in MC-166005, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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