Decals and performence, bending decals

Hello. I created something like spline decal road, and I would like to ask how can it hit performence. I want to create roads, patchs, and things like that with those splines, so there will be a lot of them. Is this OK for performence? Are decals culling at some distance?

Another question, but not that important. Is this possible to “bend” decal to spline shape? I know it is possible to bend static mesh like this, but I did not found a way to do the same thing with decals.

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