I also created the built-in previews but it doesn't seem to change much, lightroom becomes very slow

good morning, I would like to develop photos in lightroom using the full screen view of the previews,
I also created the built-in previews but it doesn't seem to change much, lightroom becomes very slow,
I was surprised since the computer used is a macbook pro 16 poliici end 2019, i9 8 core,
16 gb ram and 4 gb ram video ... hdd 1 tb ssd .. if anyone could give me some advice
I would be grateful. Michele

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