Reduce the texture scale on most faces, looks like you are
using 1x scale while you should be using 0.25 for most cases.
Wow, you've got a sharp eye, ReNo! I did use 0.25 scaling for
most of my textures, with the exception of the outside stone
floor. I was trying to boost performance by using 1x scaling on
this huge brush surface, but I'll experiment with 0.25 scaling (and 0.5
scaling) for the outside floor to see how much of a performance
degradation I get.