Reducing resolution on the textures helps. You can enhance them again by using procedurals - they have an "infinite" resolution because they're mathematic formulas that get evaluated at render time. It's the kind of material I'd love to see more - low resolution texture maps for the rough overall effects, enhanced by procedural materials for the fine detail in closeups. Then it would be possible to render at very high resolutions and still have large scenes with crisp detail. Right now the only way to get such a material is making it yourself.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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