Well, i am still with Adik here and he is just showing an extreme example, cant get that much worse. And yeah, the front face of the cylinder is warped but this just resuklts in some more or less resolution on this face but there wont be a lot of distortion in the lightmap because its getting baked etc. And of course its a lot of work and in the case of a cylinder makes no sense, Adik just wanted to proof a point. The main point for the OP is another one, break your UVs at hard edges for your quite high res model and simplify it as shown. You will get good results 