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Rendering is running after the procedur above! Time till running rendering around 20-30 minutes ...

This has been my impression as well. If I texture compress most textures in heavy scenes the precalc phase when rendering can go crazy high - as high as 15 minutes on a 2x 2969v3 CPU build.

The texture compression is still useful because you can selective only compress a couple of textures but then you'll be going out-of-core again on heavy scenes. Hope it gets further improved in the future