UE5.7 freezes when changing Landscape material on a spec. level

Hi
I have a level where I set up a 8129x8129 satellite image as landscape material on a large world-partitioned level. I want to use it while I’am editing the level but now I wanted to test my Auto landscape material but I cant change it. It freezes every single time. I’ve tried a few things but no luck so far.
Any ideas?
Thanks

if your using the landscaper plugin… it helps to upgrade to 128 gb ram.. but certain things can still take days…

No, I don’t use that plugin or any other. About RAM…yes. I wanted to upgrade but it will take days…or years if it goes on like this. I just got 16GB

32gb wasnt even enough for me… and typically i see my computer going all the way up and using all 128

Its just wierd because it runs well until i want to change it and i could change it once earlier.. well I guess I have to make a smaller map after all. sad