Do you know why your walls has 3 materials?
I got it from kennedy assets
If you want to keep them you have to figure out where the materials are used for, in order to solve your texture cut problem. Maybe you can try to give every material a different color to see what happens.
ok
Did you apply the 3 color to the 3 material attributes of the same wall?
yes
If you only see one color on the wall, I have no idea.
how bad does the texture cut look?
Not bad at all. It’s design.
so its ok to keep it?
It’s definitely okay! 
By the way, you have 4 camera’s with spotlight in your project. That’s bad for performance. Only keep the ones you need.
that must explain the horrible lag lol
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do textures cause lag?
If it are high resolution textures (I guess above 1024x1024) that’s possible.