Low fps in the new snapshot, especially on surface level
What I expected to happen was...:
get my normal 40-60 fps
What actually happened was...:
getting 20 fps
Linked issues
Comments

I am experiencing this too.
Mojang probably just needs to update the terrain generation to make it less performance impacting. I wouldn't say this is a bug just an expected feature in snapshots this big and something that would be nice to fix.
Thank you for your report!
We're tracking this issue in MC-214883, so this ticket is being resolved and linked as a duplicate.
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With surface level do you mean ± 63, where you can see the open sky?