Use -Xmx Java parameter but before all, please, don't post your comments in 2 different places.
Same thing ! 
but when I replace a cecilia's texture of grass by a standard texture for the ground, it's better but slower and the crash is later ???
Strange !
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Evil progresses when good people do nothing!
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SH3D 7.1 and nothing else - W11 64b in 4K
