When I spend too much time in a highly built area of my creative world chunks will stop loading and the game will stop processing what i'm doing except pausing. It is a huge problem for me and it stinks because i have had my world for 4 years now. I would love to record and show what i'm talking about here but unfortunately it would take too much data for this website so i'll screenshot instead
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This still happens when you disable all resource packs? Some third-party texture packs can cause freezes and even crashes of the game. It is important to know if the problem is reproduced in vanilla minecraft, since the problem can only be with one texture pack.

No this happens with default textures

The same thing happens with default textures

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