As mentioned in the latest snapshot that there is some changes in graphics rendering processes which may cause lag in older graphic cards and I am also suffering form this.
Graphic card- Intel graphics 4400
Hope u fix this soon cause right now i am having 10fps and clouds have become black in colour and the white fogg on unrendered chunks have also turned black.
Thank you for your report!
We're tracking this issue in MC-186075, so this ticket is being resolved and linked as a duplicate.
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