>>546234804
>why would you want stuff to look worse and blurry
Most of textures are actually incredibly oversized especially for a game like Rimworld. Modders make pawn and clothing textures with higher resolution than vanilla large buildings. They are insane.
And unless you are supremely autistic you won't care or even notice a difference especially on usual Rimworld zoom level, but even zoomed in close to face it looks alright.
>>546234817
I personally used this
https://www.iloveimg.com/resize-image
But it is not best since it has a 30 image limit
If you get into it you will be spending an entire day on downscaling textures anyway
What my 4 gigs look like after I was done. You can see my Unagi is -75% less than yours.