I have like RTX 4060 laptop and 16GB memory. On Steam, even minimum requirement is to have 16GB memory , so having lower than that can bottleneck your spec, lag and stuff even if your CPU and GPU aren't that bad of a toaster.
Trust me, most of video games these days beside ridiculous amount of file size. Having a 16GB RAM is a must now.
For WuWa, I mean there is the launch Directx 11 version in launcher. Test between the two directx, it may runs better in one. New graphic driver versions aren't that great, some people just use old version.
There is new graphic option, Interactive Environment, I recommend to turn it off. Just more immersive special effects, water and leaves reacting to movement or skills.
In advanced, I turn on Nvdia DLSS to use frame gen, so I can get more 60fps limit cap because whatever reason game do not support my laptop graphic card. Yes, it utilizes frame gen but after MHWilds, I appreciate them for game performance.
Super resolution and sharpening, willingness to make game looks blurry for more performance. But imo, keep them at Performance for super resolution and sharpening at 1. Super resolution just to see better lightning and grass movement along the wind.
Other than that, try the deleting shader cache from Daddy Little Kitten video.