Texture view quality rendering problem

Hi I would like to know if it is possible to avoid these defects in the final rendering (both in SD and HD version) … since the problem does not appear in the editor …
sorry for bad english …
I attach screen


Viewer optimized version of model, texture so that it’s fast to download and fast to render.
Here normal map files are huge to download, so they are compressed in the viewer version.

Possible way to avoid this is to use heightmap instead, as they compress much more easily

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Thanks for the reply!
I imagined it was a compression problem … but I thought that they were already compressed in the editor and therefore in the view3d there was no further compression.
MAgari I’ll try with hightmaps.